STBEPTAXIS. y 



Very ne.ar S. sanheyi, but narrower, with the peuuUiinale whorl 

 scarcely broader tbaa the last whorl, and with the mouth almost 

 rectangular and oblong, tlie outer margin being compressed and 

 straight as well as the columellar. (xenerally, too, the present 

 v'^pecies is smaller and more depressed. 



Length 7|, breadth 4|, height 4 mm. ; a larger specimen 

 measures 10, 7, and 5 mm.; the latter is the form figured as 

 'S. sankeyi in the ' Conchologia Indica.' 



Uah Kwengon Hill, near Moulraein {Theobald). 



II. Both parietal margin and inside of peristome tooth-bearing. 



A. Penultimate whorl roundetl. 



a. Glohoxeh/ ovate ; finely costidate above, narroivly umbilicated, 



12. Streptaxis obtusus, <%«/. /. A. S. B. xl, pt. 2, 1871, p. 166, pi. 7, 



tigs. 11-13, pi. ^!. figs. 1-4 (anatomy) ; Pfr. Mon. Hel. vii, 1876, 

 p. 495 ; Glide, Pruc. Mai. Soc. v, 1903, p. 323, pi. 12, figs. 8-10 ; 

 Nev. Hand-l. i, 1878, p. 3. 



Spire low, convex ; whorls 7, flattened above, penultimate whorl 

 bluntly subangulate below the middle and scarcely projecting 

 beyond the last whorl, which is compressed around the umbilicus, 

 and on which the sculpture becomes gradually fainter below ; 

 aperture slightly compressed on both sides, rounded externally, 

 one parietal lamella with an additional tubercle near the angle ; 

 peristome with a small tubercular tooth inside the columellar 

 margin, and another, still smaller and sometimes wanting, inside 

 the outer margin, which is but slightly arcuate. 



Length 10, breadth 7, height 6k mm. 



Ilab. Chouktalon, a limestone hill south of Moulmein (Theobald). 



b. Depressedly ovate ; striated or smooth. 



a'. Lij) of j^eristoine not continued across parietal margin of 

 a2ierture ; 1 or 2 parietal lamelhe. 



b'. Upper surface smooth^ more or less striated. 



13. Streptaxis theobaldi, Hens. A. M. N. H. (3) iii, 1859, p. 187 



Pfr. Man. Ud. v, 1868, p. 449 ; H. ^- T. C. I. 1876, pi. 8, tig. 9 

 G.-A. J. A. S. n. xlv, pt. 2, 1876, p. 317, pi. 8, fig. 15 ; Nev. 

 Hund-l. i, 1878, p. 3. 



Shell arcuately rimate, smooth, whitish, translucent ; spire low, 

 convex ; whorls 5-54, convex above; penultimate whorl rouaded, 

 not pi'ojecting or scarcely projecting beyond the body-whorl when 

 viewed from beneath ; last whorl broader, swollen beneath, com- 

 pressed around the umbilicus, rising oa the penultimate whorl 

 towards the mouth, with three indentations behind the peristome ; 

 aperture subtriangularly semi-ovate, with 7 teeth inside ; peristome 

 expanded, deeply cut back at the upper angle, with a lamellar fold 



