Palaeontology of New-York; Containing Descriptions and Figures of the Organic Remains of the Lower Helderberg Group and the Oriskany Sandstone 1855 - 1859 : Plates Volume 3, No. 2
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1861 edition. Excerpt: ...in the peristome. 5 b. View of the same, showing the sinus on the lower side of the shell. 5 c. An enlargement of the surface near the aperture, where the transverse stria; have be come lainellose. Fig. 6. Platyceras Bisinuatum. 318 6 a. The upper side of the spire, showing the sinus in the peristome, and the sinus bordering the dorsal lobe: the extension of the latter, being broken olf, presents the appearance of the notch in the peristome at this point. (i 6. The lower side, showing the sinus on the lower side of the dorsal lobe. The notch in the peristome is exaggerated by the broken condition of the shell. Fig. 7. Platyceras Pentalobus. 319 7 a. View of the spire and the plications of the surface. 7 b. View of the aperture and lower part of the spire. 7 c. Profile or dorsal view. Fig. 8 & 9. Platyceras Multisinuatum. 319 8 a. View of the aperture and lower side of the shell (which is represented as too smooth in the figure. from a little adhering stone). 8 b. View of the spire and upper side of the volutions, showing the folds or carina. 8 c. An obrlque view, showing the sinuosity in the anterior margin of the aperture. 9 a. An older specimen in which the inequalities from the upper part of the last volution are worn o ', the plications being more strongly marked on the peristome. 9 6. Dorsal or profile view, showing the outer volution above the apex of the spire. The deep sinus in the anterior margin of the younger shell is not conspicuous in this one, the peri-stome having become strongly and almost regularly plicate, except on the posterior side, where there is a broad shallow sinus. Fig.10. Platyceras Retrorsum. 320 10 a. The upper side of the spire, from which the shell is worn smooth and partially removed. 10 b....
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