PLECTOPYLIS. , i> 



C. Parietal plate ramified. 



(I. Shell acutely keeled. I'arietal fold trifiircate : a 



short horizontal fold uear aperture ci/clasjm. 



h. Shell not keeled. Parietal fold trifurcate. 



«. No horizontal fold below parietal plate, a free 



interrupted horizontal fold in front cnirnsi, 



/3. Pai'ietal fold giving oft' anteriorly an interrupted 

 horizontal fold ; a short horizontal fold below 



plate linterfc. 



y. Parietal fold giving oft" anteriorlv a continuous 

 fold. 



* Shell thin harenorum. 



** Shell thick. 



t Upper arm of parietal fold longest, lower 



horizontal fold united to apertural ridge . ropercussa. 

 •+t Lower arm longest, lower horizontal fold 

 not united to apertural ridge. 

 § Whorls much flattened, umbilicus very 



shallow cmyuhui. 



§§ "Whorls less flattened, umbilicus deeper . bensuni. 



I. Section Endothyea, Gude. 

 EndGthyra, Gude, Science Gossip, n. s. vi, 1899, p. 148. 



Sinistral. Umbilicns moderate. Palatal folds horizontal or 

 oblique. 



Type, Hellv (Plectopijlis) plectostoma, Benson. 



llanqt. Sikkim, A-^sain, Burma. 



77. Plectopylis minor, Godzv in- Austen. 



Helix (Plectopylis) oninor. Godwin- Austen, A. M. N. H. ser. 5. iv, 



1879, p. 164 ; ibid., J. A.. S. B. Ixiv, 1895, pi. 7, fig. Z (shell and 



animal). 

 ? Helix {Plectopylis) macromphalus, var. minor, Blanford, J. A. S. B. 



xxxix, 1870, p. 18. 

 Plectopylis minor, Gude, Science Gossip, N. s. iv, 1897, p. 11, fig. 47 



(shell and armature). 

 Plectoptylis (Endothyra) ininor, Gude, op. cit. vi, 1899, p. 148. 



Original descrijjtion : — " Shell sinistral, openly urabilicated, dis- 

 coidal, hirsute. Sculptui'e coarse, with irregular transverse 

 ribbing ; colour pale umber, with regularly disposed broadish 

 transverse bars of sienna brown; spire flat, only the first three 

 whorls slightly rising above the others ; suture shallow. Whorls 5, 

 subangular on the periphery of the last, which has four distinct 

 rows of short hairs, entire at the point. Aperture oblique, slightly 

 descending ; peristome lunate, slightly flattened on the upper 

 outer margin, but very little reflected, the inner margins connected 

 with a distinct ridge on the painetal side. 



