STBEPTAXIS. 



sculpture above is finer ; the base around the umbilicus is rounded, 

 not compressed; the parietal lamella less developed; the mouth 

 more rounded ; the peristome on the outer side much less convex^ 

 and neither compressed nor tubercular. 



[Fig. Q.—Streptax'is pfeifferi. X 158 & 296.] 



[The radula has the formula 29 . 1 . 29. The centre toothi is 

 smaller than the first and second ; in one specimen examined the 

 centre tooth was quite rudimentary.] 



Length 8f, breadth G, height 4i mm. 



Hah. Nicobar Islands ; Camorta, Katchall, Kar Nicobar. 



c. Ovatehj conoid ; penidtimate ivJiorl comj^leteli/ hidden from beneath 

 by body-ii'horl, ivhen seen in the direction of the axis of the 

 vpper ivhorh. 



8. Streptaxis solidulus, Stol. J. A. S. B. xl, pt. 2, 1871, p. 106, 

 pi. 7, fip. 10; Pfr. Man. Hel. vii, 1876, p. 494; H. <§• T. C. I. 

 1876, pi. 98, lig. 7 ; Nev. HancU. i, 1878, p. 3. 



Shell moderately umbilicated, whitish, solid, finely and flexu- 

 ously costulate above, smooth beneath ; spire conical ; whorls 6|, 

 the upper flatly convex, penultimate rounded at periphery, body- 

 whorl by far the largest and deepest, slightly compressed around 

 the umbiUcus; aperture semioval, parietal lamella moderate; 

 peristome expanded throughout, nearly in one plane, outer margin 

 scarcely arcuate. 



Length 12, breadth 9, height 7h mm. 



Hab. Near Moulmein, at Yethebiankoo on the Attaran Rivei . 

 Typical locality (Theobald). 



