OF SOUTHERN INDIA. 337 
Kefst., sp., which was long before known as Nerita Goldfussi=N. cingulata, Reuss, 
and which is distinguished by its granulated surface, while the two former species 
are smooth. 
6. Deshayesia, Raulin, 1844 (vide Deshayes in An. s. vert. foss. de Paris, 2d edit., 
Vol. IIT, p. 82). We cannot agree with Deshayes’ statement, that this genus should 
be classed in the Mazrcrp# instead of in the Nzerripm. It is true that the general 
form of the shell resembles some of the globose species of Natica, as the upper whorls 
are convex, the spire distinct, and the basis of young specimens slightly umbilicated. 
The typical species of Neritina show us, however, forms which are very similar to 
those of Deshayesia with regard to the form of the spire ; the umbilicus also is not 
always perfectly covered by the inner lip in immature specimens. The flattened form 
and the denticulations of the inner lip, as well as the internal thickening of the outer 
one, can be, however, only compared with similar forms of the aperture of the 
Noeeirip# and not with those of the Narrerpsz. 
Two or three species of Deshayesia are known from the tertiary strata, and one 
species, Desh. Rauliniana, Ryckholt, from the devonian is doubtfully referred to this 
genus. 
7. Neritoma, Morris, 1849 (Quart. Jour. Geol. Soe., London, V, p. 332), has 
been proposed for two jurassic species, WV. sinwosa, Morr., and N. bisinuata, iDOrbs 
sp., both of which have the general globose form of Nerita, a flattened, not denticu- 
lated, inner lip and in a mature state a posterior slight insinuation of the 
outer lip. 
The cretaceous species of the Nzrz7ip4, so far as known, belong to the following genera and 
their sub-divisions :— 
1-3. Pileolus Urgonensis, P, and C., Michaillensis, P. and C., and cretaceus, D’Orb., vide Pictet 
and Campiche, Pal. Suisse, 3me. Ser., p. 413. 
4. Pileolus Cenomanensis, Guéranger, Album paléont. d. 1. Sarthe, etc., 1867, pl. 10. fig. 10. 
Guéranger says that the species which he now calls P. Cenomanensis and which is covered with 
radiating ribs is the same to which he formerly (Repert. Paléont., ete., 1853, p. 31) applied the name 
P. cretaceus. But in this last named publication he calls P. Cenomanensis a smooth species, with 
very peculiarly folded margins of the aperture, for which reason he thinks that it could form the 
type of anew genus. The question is this, was the former P. Cenomanensis of 1853 only a cast 
of the present P. Cenomanensis of 1867? —in which case its application would be quite correct-, or are 
they different species ?- in which case the name of P. Cenomanensis of 1867 would have to be changed. 
Guéranger does not give any explanation on these points, neither does he mention in his ‘ Album pal’. 
the Pileolus Drueti, a species with radiating strize, named in his ‘ Repertoire’ of 1853. 
One or two species of Pi/eolus were collected by me some years ago in the cretaceous beds at the 
‘Traunwand’ in the valley of the Gosau (Lower Austria) ; the specimens are in the mineralogical 
cabinet of Vienna, and as yet not named or described. 
Pictet and Campiche (Mat. p. 1. Pal. Suisse, 3me. Ser., pp. 403 - 404) quote only eleven Euro- 
pean species of Nertta (including Neri¢ina), though their number is considerably larger. 
5. Nerita mammeformis, VOrbigny, only known by name. 
6. WN. Michaiilensis, P. et Camp.; the dentition of the inner lip has not been observed. 
7. NV. turbinata, Sharpe, probably belongs to the sub-generic type Neripteron of Neritina, 
though the involution of the spire is more similar to that in Alina. 
8. Neritina bicornis, Sharpe, is a typical species of Neripteron. 
40 
