374 CRETACEOUS GASTROPODA 
thickened, and anteriorly terminating obtusely, in the perfect shell often nearly 
covering the umbilical opening. 
Dr. A. Fritsch showed me at Prague several well preserved specimens of this 
species from the Bohemian cretaceous deposits from which it was originally described, 
and as the publication of Reuss’ name is somewhat prior to that of Forbes it ought 
to be retained, though neither of the figures of Geinitz, Reuss or Forbes are very 
characteristic. D’Orbigny’s figure of Zr. Jason is taken from an imperfect, small 
specimen without shell surface, it in fact only represents the top of the shell. The. 
original specimen of Solarium deperditum, in the collections of the Jardin des 
Plantes, is likewise not referrible to any other species; it has the ornamentation 
not so well preserved as represented in d’Orbigny’s figure. 
Geinitz (Quadersandsteingebirge, 1849-1850, p. 180) identifies Zr. Rozeti, 
d’Archiac (Mém. Soc. Géol., France, 2me. ser., II, pt. II, p. 336, pl. 22, fig. 11) 
from the Tourtia of Tournay with the present species. I have not been able to 
see the originals, but on comparing the respective figures with ours it will be 
seen that the Indian fossil has a somewhat larger spiral angle than the Belgian 
one. The same is, however, the case with Reuss’ original figure, and to some 
extent even with that of Geinitz; still having compared a large number of spe- 
cimens at Prague and at Dresden, I am confident that there does not exist any 
specific distinction between them. It is not only possible that the above-mentioned 
Tr. Rozeti may be proved to be identical with our shell, but the same is likely 
to be the case with Zr. Cordieri, Tr. Buneli and Tr. Huoti of the same author, 
and from the same deposits (ibid. p. 335, pl. 22, figs. 8, 9, 10). 
Geinitz quotes the species from the Hippuritic limestone of Bohemia and the 
Plener limestone of Saxony; both are about equivalent to our Upper Greensand. 
The species was probably living on coral reefs, like many of the recent Zzi- 
phinus ; it belongs to the section which includes the few umbilicated species and for 
some of which Adams proposed the name Hutrochus. 
Localities—Comarapolliam, Arrialoor, Olapaudy, between Andoor and Vera- 
ghoor, in light coloured sandstone; near Garudamungalum, in bluish sandstone. 
Formation —Trichinopoly— and Arrialoor— groups. 
XCI. CANTHARIDUS, Montfort, 1810. 
1. CANTHARIDUS sTRIOLATUS, Stoliczka, Pl. XXIV, Fig. 1. 
Canth. testa ovato-conica, apice obtusiusculo ; anfractibus circiter senis, sub- 
convexis, postice ad suturam paulo constrictis, spiraliter minute striatis, ultimo 
ad peripheriam rotundate-angulato ; basi convexiuscula; apertura subquadrata, 
labio fere recto, columella solida, antice truncate-terminanti, labro tenut. 
Spiral angle about 55°; sutural angle about 10°. + 
Height of shell : diameter of its basis (considered as 1:00) ae joo. LAIR 
of one whorl : its width ... ( Herne) a6e Oia 
” 
A small subovate shell, composed of about six volutions, which are slightly 
convex, and somewhat obtuse at the apex; the last is angularly rounded at the 
