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Published online by Cambridge University Press: 01 May 2009
The group of shells figured on Plate VIII. (excepting Fig. 12, whose position is doubtful) constitute a natural section of turbinate or trochiform species, which should be classed under one and the same genus, or at most only separated subgenerically. They are characterized, for the most part, by a conical spire, having a rather wide angle; are few whorled, separated by a widish suture, and imperforate. The sculpture is rich, consisting of spiral bands of more or less prominence, which sometimes constitute varices, single or double, as the case may be. These spiral bands are usually granulated or tuberculated, and are continued into the base of the shell, which is convex and much produced. Between these spiral bands is a fine system of axial (radial) lines or striæ, sometimes bifid, and probably forming crenulations in connection with the more prominent spiral ornaments.
page 241 note 1 This producing of the pillar in the direction of the base causes a slight point, which is held by Lycett to remove such a species as Turbo Phittipsii from the Littorinm. If this be the case, then all the so-called Amberleyas must be placed in the same category, and the general name of Turbo restored provisionally to the entire group. There are existing species of Turbo possessed of an aperture in every respect identical with that which is characteristic of the fossils now under consideration. Nevertheless, Hébert and Deslongchamps appear to have had no hesitation in regarding the pointed extremity of the base as compatible with Littorina. (See their description and figure of Littorina sulcata, op. cit. p. 55, pi. iii. fig. 3.)
page 242 note 1 Bathonian of the Moselle, p. 57, pi. ii. figs. 24, 25.
page 242 note 2 GEOL. MAG. 1880, pp. 533 and 536.
page 243 note 1 Specimens are to be seen amongst the Foreign Jurassic Gasteropoda at the British Museum marked “ Brown Jura, delta, P. Mohr,” and in pencil “ T. ornatus.”
page 252 note 1 From the American Journal of Science, vol. xxvii. April, 1884.
page 252 note 2 Silliman's Journal, vol. xxiii. p. 81, January, 1882. See also vol. xxi. p. 423, May, J881; p. 339, April, 1881; and vol. xvii. p. 89, January, 1879.
