OF SOUTHERN INDIA. b41 
whorl is ornamented with spiral strize, which in crossing the transverse ribbings 
produce an indistinct granulation. Very fine transverse strive of growth can be 
traced between the ribs on well preserved shells. Large and fully grown specimens 
have the spire usually more enveloped by the last volution and are almost smooth, 
the ornamentation of the surface having nearly all disappeared, or become obliterated. 
In some specimens there is a slight depression to be observed along the suture of 
the last whorl. The aperture is internally very much thickened ; the outer lip being 
smooth and sharpened from within, the inner lip flattened, smooth with about eight 
sub-equal teeth on the edge, which is almost straight. 
It is probable that the Otostoma ponticum, d’ Archiac (Bull. Soc. Géol. France, 
1859, XVI, p. 874, pl. 19, figs. 2-3), is identical with our Indian species, for its 
ornamentation does not appear to differ at all. 
Locality.—S. KE. of Parchairy, in greyish calcareous sandstone ; not rare. 
Formation.—Arrialoor group, very near the boundary of the Trichinopoly 
group. 
2. Nerita Caronina, Sfoliceka, Pl. XXIII, Figs. 18-14. 
Nerit. testa transversaliter rotundate-ovata, sub-depressa, anfractibus duobus 
seu tribus, postice depressis composita, spira subplana; superficie ultimi anfractus 
transversaliter crasse-costata atque minute-striata ; costis ad medium gibbosis, 
subtuberculatis, antice sub-obsoletis atque duabus liris crassis intersectis ; apertura 
lata, labro expanso atque acuto, labio calloso, valde declivi, levi, in margine sub- 
equaliter dentato, dentibus circiter octo. 
Transversal diameter of largest specimen 30 mm. 
Shell transversally roundish oval, depressed, composed of two or three very 
rapidly increasing volutions, with a flattened or very slightly elevated spire. The 
last whorl is: ornamented with strong transverse ribs, which form rounded tuber- 
culations about the middle; on the anterior half of the whorl they are almost 
obsolete and replaced by two strong spiral ridges, one of which forms the anterior 
edge of the shell. Fine striz of growth are distinctly traceable throughout the 
entire surface. The aperture is very much enlarged, the outer lip being widely 
expanded, thickened and smooth internally, but sharp on the edge. The inner lip 
is formed by a large flattened and smooth callosity, extending very low down in 
the aperture, and provided on the internal edge with about eight nearly equally 
strong teeth. 
The peculiar ornamentation of our species resembles that of the Mer. Hérne- 
siana, Zek., sp., from the Gosau-deposits, and is distinguished from it merely by 
the two strong anterior ridges, while in that last named species there are on the 
anterior portion of the last whorl several thinner and sub-tuberculated ridges. 
The only two other known cretaceous species of the same type are Ner. nodosa, 
Gein., sp. (Wat. nodoso-costata, Reuss) and Ner. cestophora, Ryckholt. 
Locality —Seraganoor, in conglomeratic sandstone ; rare. 
Formation.—Arrialoor group. 
