OF SOUTHERN INDIA. 173 
These two genera are usually treated by conchologists under the more general 
name of Pyramidella, and under this name there have been a few cretaceous species 
noticed. Strictly speaking, there is, however, from cretaceous beds not a single 
species known which corresponds exactly with the living and tertiary species of 
Pyramidella* or Obeliscus, unless it be the Pyramidella equiplicata, which name 
has been proposed by Deshayes for a species figured by Walch in the “ Naturforscher,’’ 
Halle, 1774, Vol. I, p. 204, Pl. III, Fig. 3, a publication to which I am for the 
present unable to refer. 
3. Monoptygma, Lea, 1833 (H. and A. Adams’ Gen. I, p. 284). 
3, a. Menestho, Moller, 1842.—This sub-genus quoted by H. and A. Adams 
(ibid.) is subsequently acknowledged by A. Adams as a good genus, although it 
hardly appears to be sufficiently characterized (Ann. Mag. Nat. Hist. 1861, ser. 3, 
Vol. VII, p. 296). 
3, 0. Odostomia, Flem., 1848 (H. and A. Adams’ Gen. I, p. 232) includes the 
species with somewhat shorter spire and inflated last volution; the surface is smooth 
and polished in typical forms. 
3, ¢. Syrnola, Adams, 1860 (Proceed. Zool. Soc. Lond., 1862, p. 233); sheild 
subulate, turreted, polished, whorls smooth, plain ; aperture oblong ; imner lip with an 
oblique fold in the middle ; outer lip sharp. 'The anteriorly ovate aperture and the 
presence of only one fold on the inner lip distinguished this genus from Obeliscus, 
to which it is otherwise a closely allied form. 
3,d. Styloptygma, Adams, 1862 (Proc. Zool, Soc. Lond., 1862, p. 235) contains 
a number of species of Syrnola, which are inflated about the middle of the spire, 
somewhat of the shape of a Pupa, Clausilia or Colina; the whorls are smooth 
or slightly ribbed. 
3,e. Chrysalida, Carpenter, 1858 (H. and A. Adams’ Gen. IT, p. 622) are also 
pupiform shells, with usually a cancellated surface and one columellar plait ; aperture 
contracted, peristome continuous. 
3, f. Amathis, A. Adams 1861 (Ann. mag. nat. Hist. VIII, p. 303), is another 
form with one posterior fold. 
4, Elusa, Adams, 1861 (Ann. Mag. Nat. Hist., 1861, 3rd, ser. Vol. VII, 
p. 297, and Proc. Zool. Soc. Lond., 1862, p. 237). Mr. A. Adams has proposed 
this name for the elongated, turreted species of Turbonilla with transversally 
plicated whorls and one columellar fold; it appears advisable to retain this 
genus. 
* Schafheutl (Lethea Geog. Siid-Bayerns, 1863, p. 387, Pl. LX XIV, Fig. 3) notices a Pyramidella tornatilis, 
D’Orb., although I am unable to find the reference. I would not be surprised if the author wished to 
designate Acteon tornatilis, Montf. and confounded both names, as in the case of Acteon Vibrayeana, D’Orb., 
which he evidently quotes on the next page as “ Acteonella Vibrayana., D’Orb.” The species above referred 
to is quoted from the same beds as Pyram. canaliculata, D’Orb., and would be therefore a cretaceous fossil, but 
iam afraid the one determination is quite as little to be depended on as the other. 
2w 
