326 Contributions to Indian Malacology. [ No. 4, 
8. HypsrLostoMa BENSONIANUM, N. s. 
Shell moderately umbilicated, turbinate, not distinctly striated, 
thin, horny. Spire conical, apex papillar and with the axis oblique, 
suture deep. Whorls 4, the upper ones flattened, the last bulging 
below the suture, and again at the periphery, (where it bears a pro- 
minent rounded keel,) rounded beneath, and compressed towards the 
umbilicus. It rises somewhat towards the mouth, which is round, 
nearly vertical, slightly turned upwards, free from the other whorls, 
and furnished inside with 5 lamellar teeth, 4 of which are equidis- 
tant and opposite to each other, at the upper and lower corners of 
the mouth, so as to form a partial St. Andrew’s cross, while the 
fifth, which is smaller, is close to and above that at the upper corner 
of the parietal margin. Peristome free, simple, broadly expanded 
and trumpet-shaped. 
mm. in. 
Nay ornciamc Me cesmerees so onctacee oro 0.12 
IU Tovoys CIMMIO ES Aesdcsindencacigasecaaase: mee: 0.09 
PIG Caeca see ecrnen Merete 2 0.08 
Diam. of peristome, ......... 1 0.04 
Hab.—Mya Leit Doung, Ava. 
The differences between this shell and Aypselostoma tubsiferum, 
Benson, hitherto the only known species of the genus, are numerous. 
That shell has the spire scarcely exserted, while the last whorl 
ascends so much that the mouth, which is horizontal, is on a level 
with the apex. In the present species, the spire is conical, the 
mouth nearly vertical, and the last whorl only ascends very slightly. 
In A. tubiferum also, there are more teeth in the mouth, they are 
situated further back from the aperture, and are somewhat differently 
disposed, the upper two lamelle being produced in front of the 
others, and forming an imperfect tube. ‘There are also minor differ- 
ences in striation, umbilicus, &c. Nevertheless the general appear- 
ance of the two species is strikingly similar, and the peculiar shape 
of their whorls and mouth recalls those of the Brazilian genus 
Anostoma, Lam. 
Hyps. Bensonianum occurred together with H. tubiferum on the 
high limestone peak of Mya Leit Doung about 20 miles South of 
Mandalay, the present capital of other kingdom of Ava. H, tubi- 
Serum has also been found over a wide range of country. It occurs 
