324 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 
aperture. The peristome is more reflected, and the tubercle on thé 
basal margin, which in S. Peroteti is entering, here is parallel with 
the peristome ; the costule are also coarser, and the shell is broader. 
Fig. 4 shows the aperture enlarged two diameters. 
7. Srrepraxis PLEUROsToMOIDES, n.sp. Pl. XII, Figs. 14-16. 
Shell narrowly umbilicated, sub-ovate, whitish corneous, smooth, 
shining. Spire depressed, suture channelled, apex obtuse. Whorls 53 
rounded, the last scarcely descending in front, slightly constricte -d 
behind the peristome, angulated round the umbilicus. Aperture 
oblique, subtriangular. Peristome thickened and reflexed ; margins 
distant, connected by a ridge on the parietal wall, which bears about 
the middle an entering, elev ated, gradually descending, curved fold. 
The latter is connected with the outer margin of the peristome by 
a slightly raised ridge on the parietal wall. Outer margin receding 
above, inflected about the middle, where it bears a short entering fold 
and immediately above it a slight tubercle; the basal and columellar 
bear three small, equal, equidistant teeth. Alt. 45mm.; diam. 
maj. 6°5, min. 5 mm. 
Hah.—Courtallum Hills, Tinnevelly, India. 
Type in my collection. 
This species is allied to S. Watsoni and 8. Beddomei, but is larger 
than either. From the former it further differs in the more pre- 
ponderating last whorl, which is also more dilated at the mouth ; the 
aperture is different in shape, and lacks the upper parietal and upper 
marginal teeth, while the basal and columellar margins bear three 
equal, equidistant teeth in place of the two basal ones in S. Watsonv; 
these teeth, moreover, are quite different in character in the twa 
species. In the shape, the aperture, and the number and disposition 
of the teeth, S. pleurostomoides closely resembles S. Beddomei, and 
I was at first inclined to regard it as pertaining to var. major of that 
species; but the absence of the strong costule in the umbilicus, so 
characteristic of S. Beddome?, and, what is perhaps of more importance, 
the total lack of the conspicuous scrobiculation behind the peristome, 
appear to me on fuller consideration to be sufficient to give the 
present form undoubted specific rank. The shell was received from 
Colonel Beddome, who kindly placed it at my disposal for description. 
It was accompanied by the manuscript name which I have adopted. 
ADDITIONS TO THE SYNOPSIS. 
STREPTAXIS, Gray. 
(Ante, p. 204.) 
Section I. #usrrerraxis, Pfeiffer. 
Subsection 1. dentule, Pfeiffer. 
10. Srrepraxis Dunxert, Pfeiffer. 
Stréptaxis Dunkeri, Pfr.: Hidalgo, Obras Malac., pt. 11 (1893), p. 86, 
No. 46. 
Streptaxis (Lustreptaxis) Dunkert, Hidalgo: ib., p. 128. 
