216 ZONITID^. 



a resinous lustre, translucent, pale, almost 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. 



Hah. 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, Gochvin-Atisten(A.\x&\Q\-n&),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. 



Hah. Pingoung, Shan Hills, Burma {8pratt) ; Basseiu District, 

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

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



*322. Durgella assamica, Goduin-Amten, Jour. Linn. Soc, Zool. xv, 

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

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

 [ Vide fig. 76, B-B 4, p. 220.] 



Shell imperforate, subglobosely depressed, thin, membranaceous, 

 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. 



Hah. Paniputer tea-garden near Tezpur, Assam (Lvmsden). 



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

 theca longer than in JJ. 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, Godwi?i- 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 



