OF SOUTHERN INDIA. 323 
2. Tectura Foorrana, Stoliczka, Pl. XIX, Fig. 27. 
Tect. testa depresso-conica ; apice subcentrali, obtusiusculo ; superficie striis 
concentricis minutissimis atque radiantibus fortioribus ornata, ultimis apicem versus 
obsoletis, prope marginem tenuioribus alternantibus ; apertura continua, ovato- 
elliptica, ad marginem acuta. 
This is a very characteristic oval form; it is much longer than broad; the 
apex is subcentral, placed a little anteriorly, and somewhat obtuse. The concentric 
lines are very fine ; and at intervals there are stronger, concentric, impressions 
traceable, resembling slight constrictions and indicating former stages of growth of 
the shell. The concentric strize are very thin as compared with the radiating ribs, 
which near the periphery alternate with shorter ones and are obsolete near the 
apex. The aperture is entire, with the margin sharpened from within. 
Locality —N. of Comarapolliam; the only specimen has been found attached 
to a Tectus tamulicus, n. sp. 
Formation.—Arrialoor group. 
LXXV. HELCION, Dontfort, 1810. 
1. HELCIOoN corrucatuUM, forbes, sp. Pl. XXVIII, Fig. 7. 
1846. Calyptrea? corrugata, Forbes, Trans. Geol. Soc., Lond., VII, p. 137, Pl. XII, Fig. 11. 
1850. Heleion id. D’Orbigny, Prod. I, p. 232. 
BUS6254 1s id. Gabb, Pictet, ete. 
Hel. testa conico-elevata, inflata; apice sub-acuto, incurvo, postico; superficie 
rugis concentricis atque striis radiantibus notata ; apertura continua, late ovata seu 
subcirculart. 
The shell is much inflated, elevated, and with a nearly subcircular aperture, the 
apex is distinctly incurved and placed anteriorly ; the concentric wrinkles are very 
distinct, numerous and towards the apex broader, though not more elevated; of 
the fine radiating lines there are only a few traces preserved on the original speci- 
men, which I examined in the Geological Society’s Collection of London. There 
is no other cretaceous species known, which could be compared with our fossil. 
Locality—Near Pondicherry, in light coloured, calcareous sandstone. 
Formation.—Arrialoor group. 
2. Hetcton Carnarticum, Stoliczka, Pl. XIX, Fig. 26. 
Hel. testa subconica, elevata ; apice obtuso, excentrico, postice paululum ineurvo ; 
superficie costulata, striis radiantibus circiter 16 fortioribus, atque numerosis inter. 
positis tenuissimis notata, omninis in superficie subrugatis ; apertura ovata. 
This species is based upon the single figured fragment, which has been found 
in the Arrialoor sandstone near Comarapolliam, but as the ornamentation of the 
shell is very characteristic, we distinguish it under a separate specific name. The 
