OF SOUTHERN INDIA. 363 
internally thickened and crenulated layer. Characteristic species of both genera 
are first known with sufficient accuracy from the tertiaries. 
7. Craspedotus, Philippi, 1847, (Otavia, Gray, Cat. 1857, p. 158). Shell 
globular, thick, ornamented like Monodonta; inner margin of the aperture 
thickened and crenulated, umbilical region impressed, flattened, but not hollowed 
out, outer lip externally with a conspicuous varix (see H. and A. Adams’ Gen. TI, 
p- 417, and Philippi’s Handbuch, p. 209). The type of the genus is the Medi- 
terranean Craspedotus Otavianus, Cantraine, or Cr. limbatus, Phil., for which 
Brussina again lately proposed the sub-generic name Danilia (Verhandlg. Zool. Bot. 
Gesellsch. Wien, 1865, vol. XV, p. 25). 
Ryckholt (Journ. de Conch., 1862, X, pp. 415-417) enumerates in his Catalogue of Craspedotus 
38 species, of which no less than 35 are from cretaceous rocks, two being tertiary and one recent. 
The larger number of the cretaceous species are described in the second part of the author’s 
“ Mélanges paléontologiques,” which, I am sorry to say, we have not as yet been able to obtain in 
Calcutta. With regard to the few other species quoted by Ryckholt from the Paléont. frangaise 
of d’Orbigny, I must express great doubt as to their belonging to Craspedotus. The internal 
thickened and crenulated margins of the recent C. limbatus are very characteristic, but not to be 
found in any of the cretaceous species with which I am acquainted. I do not see any benefit to be 
derived from such shifting about of species into different genera without previously stating the 
reasons which make one determination more probable than the other. Suggestions of those generic 
transfers can always be made, but they must be first confirmed by the examination of the originals, 
or of other better preserved specimens, before the new genéric determinations are really introduced 
into the literature of the family. 
8. Huchelus, Philippi, 1847 (H. and A. Adams’ Gen. I, p. 418,— Aradasia, 
Gray, Cat. 1857, p. 158,—Philippi, Handb., p. 209). The shell is characterized by 
its oval or sometimes nearly globular form, convex whorls ornamented with granular 
ridges and a solid or slightly excavated columella; the aperture is roundish, inter- 
nally somewhat thickened and striated, the outer lip being obtuse on the edge 
and crenulated, the inner usually with one or more slight tubercles. This genus 
only differs from Monilea by the want of a callous edge to the umbilicus. 
A large number of jurassic species very much resemble in external ornamentation the recent 
species of Huchelus, but in most of them no teeth or tubercles are known on the inner lip, the 
aperture being almost circular, like in Delphinula. Of cretaceous species Turbo solitarius, Stol. 
(Sitz. Akad., Wien, 1865, XVLII, p. 534) Zrochus dentigerus, d’Orb., Turbo Fonninus, d’Orb., 
7. decussatus and Goupilianus, @Orb., Trock. crucianus, Pictet and Camp., may belong to this 
genus. We shall notice one species, Huchelus ornatus, from the South Indian cretaceous rocks. 
9. Omphalius, Philippi, 1847 (H. and A. Adams’ Gen. I, p. 429,-—Philippi’s 
Handb., p. 210), is also closely allied to Monilea, and only differs from it by having 
the callus on the edge of the umbilicus very distinct; the inner lip is almost 
straight, sometimes with one or two tubercles, the columella not twisted. 
10. Trochiscus, Sowerby, 1838 (H. and A. Adams’ Gen. I, p. 482). 
11. Chlorostoma, Swainson, 1840 (ibid. p. 428) is distinguished by its broadly 
conical and depressed form, the columella is hollow, the inner lip always thickened, 
more or less covering the umbilical region; the whorls are generally spirally striated 
and transversally rugose. 
