292 ZONITID^. 



inches in diameter, and allied to the common Siamese Hemiplecta 

 distincta, Pfr., of which it may be a variety. No specimens have 

 hitherto been obtained within British territory in Tenasserim, but 

 it is not improbable that, like other Siamese shells, it may be 

 found. 



461. Hemiplecta ? textrina, Bs. (Helix) A. M. N. H. (2) xviii, 1866, 

 p. 252 ; Pfr. (Helix) Mon. Hel iv, 1859, p. 58 ; Blf. (Nanina) 

 J. A. S. B. 1865, 2, p. 87 ; H. $ T. (Helix) C. I. 1876, pi. 52, 

 figs. 2, 5 ; Nevill (Nanina), Hand-l. i, 1878, p. 32 ; Godwin-Austen 

 (Macrochlamys), Mol Ind. i. 1883, pi. 21, fig. 37 (sculpture). 



Shell perforate, depressed to conoidly depressed, rather thin, 

 pale rufescent to whitish horny, the whorls transversely striated 

 above and decussated with fine impressed spiral lines, smoother 

 beneath, and the decussating lines gradually disappearing on the 

 base towards the perforation ; spire varying from very low to 

 depressedly conoid, suture slightly impressed; whorls 5|-6|, 

 flattish, gradually increasing, the last varying from subangulate 

 to distinctly angulate at the periphery, generally slightly angulate, 

 convex beneath ; aperture slightly oblique, broadly lunate ; peri- 

 stome obtuse, slightly thickened and opaque white inside ; basal 

 margin almost straight, slightly arcuate, columellar short, sinuate, 

 oblique, moderately reflected above. 



Major diam. 29, rnin. 25, axis 15 mm. 



Hob. Western Pegu and Arakan as far north as Akyab. 



The animal has a small lobe above the mucous caudal gland, 

 and the foot is flatter than in Macrochlamys. Colour light grey ; 

 genitalia and radula imdescribed. 



A large shell measures 36, 31, and 18 mm., a small one, with the 

 spire higher than usual, 25, 22, and 14-|-. Shells from the neigh- 

 bourhood of Thayetmyo and Prome have the periphery much 

 less angulate than those from Bassein. 



This species and H. tJieodori may possibly belong to Macro- 

 chlamys, but they are more probably members of the present genus 

 or nearly allied to it. 



462. Hemiplecta theodori, Phil. (Helix) Zeitschr. Mai. 1846, p. 191 ; 

 Pfr. (Helix) Mon. Hel. i, 1848, p. 70 ; id. t. c. vii, 1876, p. 122 ; 

 H. 8f T. (Helix) C. I. 1876, pi. 59, figs. 7, 8. 



Shell openly perforate, depressed, sublenticular, pale yellowish 

 tawny, rather thin, subcostulately striated, the striae decussated 

 by spiral (longitudinal) impressed lines ; spire low, apex obtuse, 

 suture impressed ; whorls 6-6^-, convex above, the last bluntly 

 angulate at the periphery, descending near the mouth in adults, 

 moderately tumid beneath ; aperture oblique, almost diagonal, 

 broadly lunate ; peristome white, slightly thickened inside, outer 

 margin broadly sinuate, columellar curved, oblique, briefly reflected 

 above. 



Major diam. (of adult from Ataran) 26J, min. 24, height 



