PLECTOPrLIS. 



J?5 



Plecto}yylis munipurensi'^, Pilsbry, Man. Conch, ser. 2, ix, 1894, 

 p. 146 ; Gude, Science Gossip, n. s. iv, 1898, p. 263, fig. 69 (shell 

 and armature). 



Plectopylis (Chersaecia) viunipurensis, Gude, op. cit. vi, 1899, p. 148. 



Original description. — " Shell dexti'al, openly umbilicated, 

 tumidly discoid, thick, pale ochry -brown, with distant spots of 

 colour on the upper surface. Umbilicus open and deep. Spire 

 very depressedly conoid, suture shallow. Whorls 7, flat, the 

 last narrowly constricted just behind the aperture and descending 

 very slightly. At the upper and o^^ter margin of the aperture 

 is a slight compression giving a waved outline to the lip. 

 Aperture very oblique, semicircular ; peristome slightly reflected, 

 white, a low narrow, curvilinear ridge joining the margins. The 

 parietal vertical lamina is situated one-third of the circumference 

 from the mouth, having an attached anterior short horizontal 

 process equal to its length ; short supports on the posterior 



Fig. 41. — Plectopylis mimipureiisis. 



extremity and curving slightly forwards on the lower. Palatal 

 teeth 7, the lirst and upper minute, the second, third, fourth, 

 and fifth horizontal, the second being the longest, sixth minute, 

 seventh rather lengthened, horizontal, backed by a single isolated 

 small tooth." (^Godivin- Austen.) 



Major diam. lO-o-ll, minor 9-9-5 mm. ; alt. 5 mm. 



Bah. Burma: Ihang Y ollej, ^Innipur (God win- Austen). 



The parietal armature consists of a single, strong, vertical plate, 

 which is obliquely deflected towards the aperture ; it has two 

 slight supports posteriori}' — the lower a little deflected, the 

 ujiper obliquely raised — and gives off anteriorly, at the upper 

 extremity, a long, slightly raised ridge ; a minute denticle occurs 

 just below the vertical plate (see fig. ild, which gives an enlarged 

 view of the shell with a portion of the outer wall removed). The 

 palatal armature consists of six more or less horizontal folds : 

 the first very minute near the suture ; the second Ions: and 

 desceuding a little obliquely towards the middle, with the posterior 

 end suddenly raised ; the third and fourth also descending a little 



