216 



a resinous lustre, translucent, pale, alraost whitish horny ; spire 

 low, convex, apex obtuse, suture shallow; whorls 3|, rapidly 

 increasing, slightly convex above, the last ascending near the 

 mouth, rounded at periphery, rather tumid beneath; aperture 

 oblique, roundly lunate ; peristome thin, margins converging, 

 columellar curved, vertical above, slightly reflected. 



Major diam. 7, min. 6, height 4 mm. 



Hob. Thayet Myo, Prome, and Akauktoung in Upper Pegu. 



This is distinguished from D. levicula by being much more solid, 

 by lower spire, and much smaller mouth, the diameter of which 

 measures 3| mm. in a specimen 7 mm. in major diameter, whilst 

 in a D. levicula of similar size it is over 4. 



321. Durgella erratica, Godwin-Austen (Austenia), P. Z. S. 1888, p. 241. 

 Nanina levicula, Blf, J.A.S. B. 1865, 2, p. 87, pt. ; Nevill, Hand-L 

 i, 1878, p. 26, pt. : nee Bs. 



Shell openly perforate, globosely depressed, thin, translucent, 

 smooth, slightly polished, pale amber or brownish ; spire nearly 

 flat, slightly convex, suture shallow ; whorls 3^-4, rapidly in- 

 creasing, flatly convex above, the last much larger, scarcely 

 descending in front, rounded at the periphery, convex beneath ; 

 aperture oblique, diagonal, ovately lunate ; peristome thin, upper 

 margin slightly depressed, columellar oblique, reflected. 



Major diam. 8, min. 7, height 4 mm. 



Hal. Pingoung, Shan Hills, Burma (Spratt) ; Bassein District, 

 Pegu ("FT". T. B.). Distinguished from D. levicula by more open 

 perforation, a rather thicker shell, and a smaller mouth. 



*322. Durgella assamica, Godwin-Austen, Jour. Linn. Soc., Zool. xv, 

 1881, p. 294, pi. 20, figs. 5, 6, 8, pi. 21, figs. 2, 4, 4 a, 6 ; id. MoL 

 2nd. ii, 1898, p. 63, pi. 77, figs. 1-6 (shell and anatomv). 

 [Fitfefig.76,B-B4,p. 220.] 



Shell imperforate, subglobosely depressed, thin, inembranaceous, 

 smooth, olive-brown ; spire low, suture impressed ; whorls 4, 

 rapidly increasing ; aperture ovately lunate, oblique ; peristome 

 thin. 



Major diam. 9'5, min. 8-2, height (from figure) 5 mm. 



Hob. Paniputer tea-garden near Tezpur, Assam (Lumsden). 



No dart-sac found in the two specimens examined. Sperma- 

 theca longer than in D. levicula. A large overhanging lobe to 

 the mucous pore. Peripodial lines strongly marked and triple. 

 Odontophore as in D. levicula. 



*323. Durgella mairangensis, Godwin-Austen, MoL Ind. ii, 1898. 



p. 64, pi. 77, figs. 7-11 (shell, details of anatomy, and radula). 

 Helicarion salius, Godwin- Austen, J. A. S. B. 1876, 2, p. 313: 

 nee Bs. 



Shell globosely depressed, thin, smooth, shining, pale straw- 

 colour ; spire very low, almost flat, suture shallow ; whorls 3, the 

 last rounded, tumid beneath ; aperture oblique, descending, ovately 



