OF SOUTHERN INDIA. 329 
have evidently followed Gabb’s propositions (Am. Phil. Soc., Vol. VIII, p. 122), 
and transferred all the known species of Patella and others to Helcion. It is 
true that very few of the species among those described as Patella seem in reality 
to belong to this genus, but we do not understand for what reason species like 
Patella campanulata, Geinitz (Reuss, Boehm. Kreide, IT, pl. 44, fig. 9), and a 
few others are transferred to Helcion. Gabb (Palont. Calif, 1864, I, p. 140, 
pl. 21, fig. 103,) lately described a Pat. Traskii from the Californian cretaceous 
deposits. 
LXXVI. PATELLA. 
1. PATELLA ? sp., Pl. XIX, Fig. 28. 
We have obtained from the South Indian cretaceous rocks only one specimen, 
which appears to be a Patella. The representation given on Plate XIX only 
shows the internal view of the specimen, which is ovately elongated with a sub- 
anterior apex. The anterior margin of the shell is entire, though there appear 
to be traces of external ribs perceptible. Posteriorly the shell is much produced, 
somewhat expanded and terminates with four strong ribs, the inner pair of which 
is more prolonged than each of the outer ones. The edge of the aperture is other- 
wise sharp, and the internal structure not differing from that of other Puatelle. 
Except a few continuous furrows indicating different stages of growth, there is 
nothing distinctly traceable of a muscular impression. The specimen is so tho- 
roughly imbedded in a calcareous rock that it is impossible to obtain a view of 
the smallest portion of its outer surface. It will suffice for the present to draw 
the attention of any future observer to this interesting species. With respect to its 
general form we could only suspect, that better specimens may possibly show the 
species to be an Amathina (fam. Capvzrp#), though the internal view of the apex 
gives little support to this determination. 
Locality.—Kast of Odium. 
Formation.—Ootatoor group. 
IV. Sub-order,—Scutibranchiata. 
Char. PRosoBRANCHIA with gills consisting of one plume, which is formed of 
two equal series of lamelle and is placed on the left side in a cavity over the 
back of the neck; heart traversed by the rectum; sexes distinct, but the males 
are said to have no external copulative organs developed; lingual teeth distin- 
guished by a large number of uniform lateral ones. 
Shell spiral, depressed or conical ; aperture with the margins entire. 
We here restrict the name SCUTIBRANCHIATA to those shells only, the 
animals of which possess one branchial plume consisting of two series of lamelle, 
and are thus readily distinguished from those of the Pros. CreNoBRANCHIATA, 
in which the plume is provided with a single series, or if a second one be present, 
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