TESTACELLIDJB. 



[Fig. 4. Buccal mass, ganglia, &c. of Streptaxis obtusa. (After Stoliczka.)] 



The measurements of Streptaxis are the following : The length 

 and breadth are the diameters of the shell as it rests on the body- 

 whorl ; the height is that of the shell laid on a flat surface at right 

 angles to the other two. 



.Forms of this genus are common on the hills of Southern India, 

 and several of the species occurring appear to be widely spread 

 and very variable. The teeth in the peristome vary in number 

 and position, and even the number of the parietal lamellae is not 

 always constant, whilst important differences may be found at 

 times in the shape of the shell. 



I. Peristome edentulous or nearly so (occasionally a small 

 tubercle inside right margin). 



A. Penultimate whorl rounded or bluntly angulate, not Tceeled ; 

 a single parietal lamella. 



a. Depressedly ovate ; penultimate ivhorl, seen from beneath, 

 extends half its width beyond body-ivhorl. 



1. Streptaxis petiti, Gould (Helix-Streptaxis), ost. Jour. N. H. iv, 



1844, p. 456 ; Pfr. (Streptaxis) Mon. Hel i, 1847, p. 8 ; id. t. c. 

 vii, 1876, p. 494 ; H.fyT. C. 1. 1876, pi. 8, %. 4 ; Nev. Hand-l i, 

 1878, p. 3. 



Shell umbilicated, translucent, whitish, finely, closely, and 

 flexuously costulate above, smooth beneath ; spire depressedly 

 conoid ; whorls 6|, convex, penultimate whorl subangulate, last 

 whorl flatly convex beneath, compressed around the umbilicus ; 

 aperture a truncated oval ; peristome white, expanded throughout, 

 outer margin much curved forward. 



Length 10, breadth 7, height 6| mm. 



Hob. Tavoy and Mergui, Tenasserim ; ? Moulmein. 



2. Streptaxis bombax, Bs. (Helix) A.M.N.H. (3) iii, 1859, p. 186; 



Theob. J.A.S. S. xxviii, pt. 2, 1859, p. 308 ; Pfr. (Helix) Mon. 



