OF SOUTHERN INDIA. 339 
named species it is very probably the case, because the small number of rapidly increasing whorls, 
as represented in Nillson’s figure, are not often to be met with among Wa7rcrpm, but usually 
occur in the family Nzri7ip4. A doubtful species of Nerita was noticed by me from the Gosau- 
deposits (vide Sitzb, Akad., Wien, 1860, Vol. XX XVIIL, p. 495). 
Prof. Forbes described four species of Nerita, which have been variously commented upon by 
@Orbigny and subsequent authors, though not with great success. We have been able to procure 
good specimens of all of our species of the Nzrirrp4, and after having compared Prof. Forbes’ 
originals in the London Geol. Society’s collection, we have to report from the South Indian cretaceous 
deposits five species, which will be described subsequently ; 
36. Neritina compacta, Forbes, sp.=Nerita id. Forbes. 
37. 7 decipiens, nov. sp. 
38. Nerita divaricata, VOrb. = N. ornata, Forbes. 
39. » Carolina, nov. sp. 
40. 4, rugosissima, Forbes, sp. = Natica ? idem, Forbes. 
Nerita munita of Forbes is a Vanikoro (vide p. 309), and Nerita oviformis, Forbes, is a 
species of Huptycha of the family AcT“0NnIDs&, of the OpistHoBRANCHIA. 
Thus we have at present 40 recorded species of Nzerrrpx from cretaceous rocks, 
and most of these species are from the upper or Senonien beds. Still it can hardly 
be supposed that they represent more than a limited number of those species which 
existed during that period. But the fact that among this comparatively small 
number of already known cretaceous species, nearly all the generic and sub-generic 
types—(except Navicella)—of the recent Nurirrpm are represented, seems to prove 
that these divisions have a better classificatory value, than they would appear to 
possess from a general review of only the living species. 
LXXVII. NERITINA, Lamarck, 1809. 
1, Nerrtina compacta, Forbes, sp. Pl. XXIII, Fig. 8, and Pl. XXVIII, Fig. 4. 
1846. Nerita compacta, Forbes, Trans. Geol. Soc. Lond., VII, p- 122, Pl. XV, Fig. 6. 
idem. d'Orbigny, Pictet and Campiche, Gabb, and others. 
Nerit. testa subglobosa, transversaliter subovata, levigata, striis inerementi sub- 
obsoletis notata ; onfractibus tribus ; spira brevi, acuminata, sepe obtuse decollata ; 
apertura semilunata, postice angustata, labio calloso, levi, margine interiori prope 
recto, tridentato ; dente posteriori crasso, dentibus duobus anterioribus minutis. 
This species appears to be a true Neritina, having the spire short and pointed 
and in form resembling several recent species. The inner lip has on the margin only 
three teeth, of which the posterior one is the strongest and the two anterior much 
smaller, while in the typical recent Neritine, there are usually a large number of 
small teeth present. The surface of the shell only shows fine strize of growth. 
I have not been able to observe the spiral striation to which Prof. Forbes alludes, 
either on his original or on two other specimens in our Survey collection. 
Locality —Near Garudamungalum in calcareous, bluish sandstone, 
Veraghoor, in soft, whitish sandstone; rare. 
Formation.—Trichinopoly — and Arrialoor — groups. 
and near 
