OF SOUTHERN INDIA. 427 
the previous one, to which it is allied as regards the form of the inner lip; the 
external thickening of the outer lip is not equally strong in this as it is in the 
last species. 
Localities —N. and 8. of Serdamungalum and W. of Koloture, in whitish 
sandstone; rare. 
Formation.—Trichinopoly group. 
LIX. Family, —BULLIDZ. 
I shall include in this family beside the Buzzrrp#, as noted in H. and 
A. Adams’ ‘ Genera’ and partially emended by Gray in his ‘Guide’ of 1857, a portion 
of H. and A. Adams’ family Crzicuyip%, and the Aupuispuyrap# and part of the 
Boriiwap# of Gray. 
All Borrrpz have a large body with an expanded mantle, partially covering 
the shell, the head is distinct, broad, the tentacles flat, fleshy, sometimes separated, 
but generally united into a posteriorly emarginated disk; the base of the foot is 
generally not very large, at least not much larger than the shell itself, but rather 
muscular. The presence or absence of the eyes, or their being more or less sunken 
in the fleshy substance of the tentacles, appears entirely to depend on the habits 
of life. Species or genera which are accustomed to burrow in sand do not require 
eyes, and are therefore generally blind, while those which live on coral-reefs or 
on seaweeds are provided with eyes. The dentition consists of numerous cross 
series, there is always one broad, finely denticulated central tooth present and a 
number of unequally or equally formed laterals. 
The species are carnivorous, usually feeding on small bivalves which they 
swallow entire, crushing their shells with their strongly muscular gizzard, usually 
provided with horny or calcareous sides or plaits. 
The shell is external, spiral, strongly involute or convolute, mostly ventricose, the 
last whorl enveloping all the previous ones. Aperture anteriorly widened, entire ; 
no operculum. 
The family could be divided into two divisions. On account of the difficulty 
in distinguishing the fossil species of Cylichna from Haminea and Atys and others 
I shall give a list of the cretaceous species subsequently after reviewing the genera. 
a. Sub-family,—CYLICHNIN A). 
Animals with frontal disk strongly produced, posteriorly emarginated, mantle 
enclosed or partially covering the shell, which is distinguished by usually having 
anteriorly slight columellar folds. There is one central tooth, one large, hooked 
inner lateral on either side, and often five or six much smaller outer lateral 
ones. 
1. Retusa, Brown, 1827 (H. and A. Adams, Gen. IT, p. 11). 
2. Diaphana, Brown, 1827 (ibid., p. 12, Amphisphyra, Lovén apud Gray, 
Philippi, &c.). Of both these genera the shells are very much alike, being 
