OF SOUTHERN INDIA. 347 
under the names of Zrochus, Delphinula, Rotella and others. Deshayes in his last 
edition of the Paris fossils (Vol. II, p. 919) reports the unusually large number 
of 14 species, though a few of them appear to belong to Chrysostoma and Lewisiella 
(n. gen.) It seems very improbable, that the few among Deshayes’ species, which 
have a small umbilicus and a less developed callus, can be generically separated 
from Teinostoma (as may be supposed from the inspection of the figures) unless 
they belong to Vitrinella. If they are not fully grown shells, they may belong 
either to Teinostoma, to Adeorbis, or Vitrinella. A. Adams (Ann. mag., 1861, VIII, 
p- 305) describes from Japan a Teinost. Carpenteri, of which he says, that it 
possesses a slight rimal fissure. The secondary species of Teinostoma are still less 
numerous, as the difficulty in procuring them is generally much greater. We notice 
the only one known from cretaceous rocks, Teinost. cretaceum, d’Orb. sp.. Jurassic 
species are noticed by Quenstedt (Jura), d’Orbigny (Pal. frang.), Buvignier (Stat. 
de la Meuse, etc.), and others. The Rotella macrostoma described by me from the 
lias (Sitz. Akad., Wien, 1861, XLIII, p. 178, pl. 3, fig. 5) must be considered as a 
Temostoma, though of a somewhat larger size. 
7. Helicocryptus, VOrbigny, 1850, (Pal. frane. terr. jur., II, p. 302); planorboid, 
rather involute, smooth or slightly ornamented shells, which have the columellar lip 
callous, so as to fill up the internal space between the outer lip and the sides of the 
preceding whorl, which projects in the space of the aperture; the outer lip is 
sharp, not expanded or very perceptibly thickened; the umbilical region is without 
callus. 
The typical species is H. pusillus, d’Orbigny, |. cit. pl. 321, figs. 1-4, from the 
corallien of St. Michel. Another jurassic and very similar species from the same 
locality was described by Buvignier as Rotella dubia, (Stat. Géol. de. la Meuse, 1852, 
p. 36, pl. 24, figs. 6-9). A few more are known from cretaceous deposits, but 
none have been reported from the tertiary rocks. The recent forms which are 
allied to the fossil Helicocryptus, are some of the involute species of Vitrinella and 
Teinostoma. 
?8. Vitrinella, C. B. Adams, 1850 (H. and A. Adams, Gen., I, p. 484), small, 
pellucid, trochiform or orbicular shells, which have a vitreous structure. The 
umbilicus is either narrowly open or internally filled with a callus, so as to leave a 
depression in the centre of the basis. 
The species are found in sand under similar circumstances as the Umbonia and 
Teinostomata, to which they are closely allied. I should think the non-umbilicated 
species can hardly be distinguished from Teinostoma, though I do not know any 
of the typical Jamaican species from personal examination. 
The Zeinost. wmbilicare, Desh. (Paris foss, 2me ed., II, pl. 63, figs. 27-29) may 
be a Vitrinella or a young Teinostoma. Other fossil species, which may belong to 
that genus, are scarcely known. Adams in a paper on Adeorbis (Ann. mag. nat. 
hist., 1861, VIII, p. 244) says, that “the genus Vitrinella is composed of a some- 
what incongruous assemblage,” etc. It would not be very surprising to find, that 
the umbilicated species of Vitrinelia belong to Adeorbis or Mérchia, and the non- 
umbilicated to Zeinostoma; what would then remain to be called Vitrinella has 
