A Monograph of the British Fossil Cephalopoda |
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Page 1
... usually formed into a free fold called the mantle , from which may be developed branchia on one side and a shell on the other . In the possession of a distinct head , and of that remarkable organ in the floor of the mouth , known as the ...
... usually formed into a free fold called the mantle , from which may be developed branchia on one side and a shell on the other . In the possession of a distinct head , and of that remarkable organ in the floor of the mouth , known as the ...
Page 2
... usually , the organs of locomotion ; while the organs of circulation follow more or less the flexure of the intestine . The first great distinction of the CEPHALOPODA is the rudimentary condition , or even absence , of that conspicuous ...
... usually , the organs of locomotion ; while the organs of circulation follow more or less the flexure of the intestine . The first great distinction of the CEPHALOPODA is the rudimentary condition , or even absence , of that conspicuous ...
Page 7
... usually twelve or thirteen , but sometimes sixteen , and usually more on the inner than on the outer process , but the number is not always equal on the two sides . They have the same structure as the digital tentacles . The band of ...
... usually twelve or thirteen , but sometimes sixteen , and usually more on the inner than on the outer process , but the number is not always equal on the two sides . They have the same structure as the digital tentacles . The band of ...
Page 14
... usually characterise that organ . The nerve , arising from near the end of the upper commissure , expands after entering the pedicle into a large mass at the base of the eye , where it divides and subdivides to form the sentient layer ...
... usually characterise that organ . The nerve , arising from near the end of the upper commissure , expands after entering the pedicle into a large mass at the base of the eye , where it divides and subdivides to form the sentient layer ...
Page 17
... usually called the porcellanous layer , because it is opaque . As seen in a thin section parallel to the surface , it presents a speckled appearance , which , on raising the magnifying power , is seen to be due to a number of ...
... usually called the porcellanous layer , because it is opaque . As seen in a thin section parallel to the surface , it presents a speckled appearance , which , on raising the magnifying power , is seen to be due to a number of ...
Other editions - View all
A Monograph Of The British Fossil Cephalopoda J F (John Frederick) 1839-1 Blake No preview available - 2023 |
A Monograph Of The British Fossil Cephalopoda J F (John Frederick) 1839-1 Blake No preview available - 2023 |
Common terms and phrases
Actinoceras annulatum aperture appears Aymestry Bala Beds Bala Series Barrande basal diameter body-chamber Bohême British Builth Carboniferous central Cephalopods chamber characters cicatrix circular collection of Dr compressed concave Coniston convex side convexity curve CYRTOCERAS Description.-The Desertcreat distance Distribution.-In dorsal Dudley elliptic Endoceras examples figured flattened Foss Fossils genus Geol GOMPHOCERAS greatest diameter Grindrod ibex imbrications inches last whorl layer Ledbury Leintwardine lines of growth Lituites Llandeilo Llandovery long diameter Lower Ludlow Lower Silurian Ludlow of Ledbury M'Coy Museum of Practical Nautiloidea Nautiloids Nautilus nearly oblique ornaments ORTHOCERAS Orthocerata Phragmoceras Portlock Practical Geology rate of increase ratio riblets ribs Salter seen septa septa are direct septal surface septum Shale shell sigmoid Silur Silurian rocks siphuncle slightly Sowerby in Murchison's species specimen sutures Syst transverse Trochoceras Type.-The section undulating Upper Llandovery Upper Ludlow Upper Silurian ventral side Wenlock Limestone Wenlock Shale whorl Woodwardian Museum
Popular passages
Page 69 - PORTLOCK.- REPORT ON THE GEOLOGY OF THE COUNTY of LONDONDERRY, and of Parts of Tyrone and Fermanagh, examined and described under the Authority of the Master-General and Board of Ordnance. By JE PORTLOCK, FRS &c.
Page 77 - FREDERICK M°CoY, FGS One vol., Royal 410. Plates, /i. is. A CATALOGUE OF THE COLLECTION OF CAMBRIAN AND SILURIAN FOSSILS contained in the Geological Museum of the University of Cambridge, by JW SALTER, FGS With a Portrait of PROFESSOR SEDGWICK.
Page 78 - On the Succession of the Ancient Rocks in the vicinity of St. David's, Pembrokeshire, with special reference to those of the Arenig and Llandeilo Groups, and their Fossil Contents,
Page 77 - Silnrians. p. 170 -174.) On the tripartite classification of the Lower Palaeozoic Rocks, in: Geol. Mag. N. Ser. Dec. II. Vol. VI. 1879. p. 1—15. (Dnrch die fossile Fauna bestimmt.) and J. Wilson, On the Silurian Rocks of the Counties of Roxburgh and Selkirk.
Page 75 - On the Break between the Upper and Lower Silurian Rocks of the Lake District, as seen between Kirkby Lonsdale and Malham, near Settle, in : Geol.
Page 140 - ... connects it with O. semicircularis, Eichw. and O. carinata, Conrad, Ann. Rep. 1839, p. 64. Nevertheless I do not feel sure that this may not ultimately prove a variety of O. callactis, Dalm., a species which unfortunately has never been published with sufficient detail. ORTHOCERAS VAGANS, Salter, MSS. Smooth ; long tapering when young, more conical when old : septa broad elliptical, oblique on the longer axis, moderately distant in the young shell, distant by more than the diameter in mid-age,...
Page 74 - ... Quart. Journ. Sc. Vol. 3. 1863. p. 178—179. Note on the Fossils [of part of the Counties of Cork and Kerry.] in : Explanations to accompany sheet 197 and 198, and the south east part of 191, of the maps of the Geol. Survey of Ireland. Dublin, 1860.
Page 75 - and " Bala limestones," near Oswestry. (ditto), 343-7. 4. Denudation, unconformability, and the Vale of Clwyd. (ditto), 476-8. 5. List of fossils described from the Bala limestone and its associated beds of North Wales. Liverpool Geol. Soc. Proc., vi, 1865, 30-4.
Page 105 - On the surface of these caps the deeper furrows lie on the side nearest to the siphuncle ; they are generally median, but occasionally paired ; on the other side are three or more lighter furrows, which occasionally bifurcate. It is difficult to conjecture the cause of these phenomena, which must have had their origin between the formation of one septum and the next. I can only...
Page 71 - ... rocks, and in which, in its published form, the first Scottish Maclurea was figured and described, though somewhat doubtfully, from the imperfect state of keeping of the specimen, and under another name. At the meeting of the British Association held in this city in 1850, Professor Sedgwick read a paper on the Geological Structure and Relations of the Frontier Chain of Scotland...