OF SOUTHERN INDIA. 295 
seas, nevertheless there is no direct proof*, that similar forms were formerly not inhab- 
iting warmer seas, and as there are still large unexplored areas, other species may 
be found living somewhere ata great depth. We have in Amauropsis a similar 
case to that which we have mentioned in Trichotropis, of which, however, several 
tropical species have already been discovered. 
The species from cretaceous rocks are not numerous. I may mention A. paludineformis, Meek 
and Hayden, (Mem. Acad. Boston, V, p. 389, pl. 3, fig. 3), A. oviformis, Gabb, and A. alveata, Con. 
sp. (Pal. Calif. 1864, I, pp. 109-110). In my revision of the Gosau—Gastropoda (Sitz. Akad., 
Wien, 1865, LII, p. 44,) I have referred Natica acuminata, Reuss, to Amaura, which ought to 
stand as Amawropsis acuminata, being very closely allied to the recent species, A. canaliculata. Other 
species are Wat. Cussisiana, d.Orb., perhaps WV. Clementina, @’Orb., and also Nat. vulgaris, Reuss. The 
Turbo conicus, Sow., (Min. Conch. V, p. 45, pl. 433, fig. 1; Natica sub-conica, d’Orb., Prod. II, 
p- 150), is also an Amauropsis. I have lately examined Sowerby’s original in the British Museum, 
and found the specimen spirally striated. This species ought then to stand as A. conica, Sow. sp. 
We have to note from South India A. pannucea, n. sp. 
3. Ptychostoma, Laube, 1866, (Sitz. Akad., Wien, Vol. LIII; Fauna der 
St. Cassian Schichten, p. 3), has a shell like Amauropsis, but apparently with a 
twisted inner lip. There are three species referred to it by Laube, Pty. pleuroto- 
moide, and Pty. sancte crucis of Wissmann, and Pty. gracile, Laube; they are all 
from the triassic beds of St. Cassian. 
4. Ampullina, Lamck., 18138 ?; (H. and A. Adams, Gen. I, p. 208). There is 
only a single recent species, 4. fluctuata, Sow., as yet known, but the genus appears 
to have a very large number of representatives in the mesozoic and paleeozoic forma- 
tions. The shell is characterised by the ventricose form of the last volution and a thick 
inner lip, either leaving a slight fissure exposed at the termination of the columella, 
or mare frequently covering the entire central portion of the basis. Many of them 
very much resemble in their form some species of Ampullaria and also of 
Euspira, but they are readily distinguished from them by a greatly thickened inner 
lip, which is closely attached to the shell. The spire is pointed and more or less 
elevated, but seems to vary very considerably, even within the limits of one and 
the same species (vide Plate X XI, Figs. 11-15). 
T have already in my revision of the Gastropoda of the Gosau formation (Sitzungsb. Akad., 
Wien, 1865, LII, p. 43,) placed the Natica bulbiformis, Sow., in this genus. The very same species 
is also found in South India, and besides this another very characteristic new species, Amp. sortita, 
has been found in the upper beds of the cretaceous deposits at Ninnyoor. Other cretaceous 
species of the same genus are V. mastoidea, P. and Camp. (Mater. p. 1. Pal. Suisse, 3me. Ser., 
pl. 76, figs. 2-3); WV. dulimoides, VOrb., N. Requieniana, VOrb., (if distinct from N. du/bi- 
formis 1 Pal. frang. terr. erét.), and probably many more, which at present are known only from 
casts. 
4a. Naticopsis, M’Coy, 1844, (Synop. carb. foss., Ireland, 1862, p. 33). The 
typical specimens of this genus only appear to differ from the former by a some- 
what shorter spire; some of the species, however, which were subsequently des- 
cribed under the same generic name, are actually not to be distinguished from 
Ampullina. 
* A recent species was found by A. Adams in the Japan sea. 
