324 CRETACEOUS GASTROPODA 
radiating ribs, of which about 16 are much stronger than the rest, are intersected by 
very fine concentric striz which thus produce a fine granulation on the former. 
The apex is obtuse, but somewhat worn off on our specimen, posteriorly slightly 
incurved. 
Locality.—Comarapolliam ; apparently very rare. 
Formation.—Arrialoor group. 
XLV. Family,—GADINIID. 
H. and A. Adams, Genera I, p. 462; Gapbmnr4aD#, Gray, Guide, 1857, p. 172; Chenu 
Mantel, I, p. 375. 
The living species of the genus Gadinia are distinguished by their largely 
developed, funnel-shaped tentacles, with eyes sessile on the sides of their base ; 
the gills are single, placed obliquely across the back of the neck, in form and _posi- 
tion resembling those of the Tzcruripm and ZLeperinz; the foot is flat, thin 
and simple. 
The shell is very much like that of a Patella»being depressedly conical, with « 
more or less roundish aperture, internally with a marginal horse-shoe-shaped muscular 
impression, and with a groove in front of the right side not being, however, distinctly 
marked on the external surface. 
Prof. Pictet mentions (Traité de Pal., Vol. ITT, p. 298), that the Mediterranean 
Gadinia (Gardinia) Garnoti, (Pileopsis id. Payradeau,) occurs fossil in the quaternary 
deposits of Sicily. There are besides some other fossil forms, which appear to 
belong to this family. Chenu associates in it the jurassic form Deslongchampsia, 
M.’Coy, which is distinguished by a scar running from the apex to the margin, 
towards which the former is slightly incurved; on the margin itself the scar is 
produced spoon-shaped. There are at present, I believe, only three jurassic species 
known, Desl. appendiculata, Desl., Desl. Hugenti, M.’Coy, and Desl. loricata, 
Laube, (Sitzgsb. Akad., Wien, 1866, LIV, Gastropoden des braunen Jura., ete., p. 2. 
IT may, however, draw attention to certain ecretaceous species, like Hmarginula 
Villersensis, Pictet and Camp., (Mat. p. 1. Pal. Suisse, 38me. Ser., pl. 97, fig. 18), 
which appears to have had a scar on the same (anterior or ? posterior) side towards 
which the apex is incurved. There is no sign of a slit visible on the cast, the shell 
itself not having been as yet found preserved. There are also a few paleozoic 
Patelle known, like P. scutellum (Hichwald Leth. Ross. 1860, Vol. I, p. 1097, 
pl. 41, fig. 17), which very much recall the form of Deslongchampsia by their 
elevated and obtuse apex. 
Another genus which may belong to this family is Metoptoma, Phillips, 
(Yorksh. pt. IT, 1836, p. 223), having a shell like Helcion, with a broad but slightly 
or obsoletely marked scar below the apex, truncate or somewhat insinuated on 
the margin. Chenu quotes Metoptoma as a synonym of Deslongchampsia which 
cannot be admitted. The Pat. solaris, Koninck, of which he gives a figure on 
p. 376, is a true Metoptoma. Some other species are described from the mountain 
