210 HELICID^. 



with the strife of growth ; peristome acute, pillar lip partially re- 

 flected over the umbilicus; a strong white rib within the aperture, 

 showing usuaUy a rufous band externally, umbilicus moderate, 

 exposing a portion of the penultimate whorl. Some have a pale 

 line along the periphery of the body whorl, which is slightly 

 angular. 



"Diameter y^^ inch [ = 15 mm.]." (Hutton.) 

 Hah. Afghanistan, Caudahar (Button), type. Burma {Cuming 

 Coll.), var. 



The var. biirmanica differs from the type in being more de- 

 pressed, more widely umbilicated, in having the periphery sub- 

 angulated and the basal margin of the peristome nearly straight 

 and obliquely ascending towards the columellar margin. The 

 s])ecimen in the Cuming collection of the British Museum, upon 

 v^hich this new variety is based, is also considerably paler than 

 the type, but, notwithstanding, shows the peripheral pale band 

 distinctly. 



Genus PLECTOTROPIS, Martens. 



Then, Albers, Die Heliceeii, 1850, p. 118 (not Then, Coleoptera, 

 Mulsant, 1846). 



Plectotropis, von Martens, Die Heliceen, ed. 2, 1860, p. 121, as 

 section of Helix ; Pilsbry, Man. Concli. ser. 2, ix, 1895, p. 208, as 

 section of Eulota, pi. 65, figs. 13, 14, pi. 66, tigs. 33, 34 (anatomy). 



Type, Helix elegantissima, Pfeiffer. 



Range. India, Burma, Farther India, Japan, China and adjacent 

 Islands, south to the Malay Archipelago. 



" Shell depressed and carinated, widely umbilicated, dull and 

 brown, with more or less shaggy cuticle and usually a peripheral 

 fringe of hairs ; whorls numerous (5 to 8), narrow and slowly 

 increasing. Aperture small, angulate-lunar, oblique; lip narrowly 

 expanded, reflexed below. 



" Jaw high-arched, with many (10-19) ribs, more or less 

 denticulating the basal margin. 



" Eadula having the middle tooth without side cusps, but with 

 a lateral bulging, middle cusps about the length of basal plate ; 

 laterals with a small ectocone. Marginals with the long inner 

 cusp bifid, ectocone split into two. 



" Genitalia ; penis rather long, epiphallus short, strongly bent 

 at the attachment of retractor, continued in a rather short, blunt 

 flagellum. Dart sack large, containing a long, slightly curved 

 dart, lens-shaped in section. Mucus gland inserted high on dart 

 sack, divided into two glandular branches which are wide, flattened 

 and rather incoherent, the dart sack and glands bound loosely to 

 vagina. Duct of spermatlieca very long and slender, without 

 diverticulum, bound to oviduct." (Pilsbj-j/.) 



The species constituting the group of Plectotropis appear to me 

 60 well characterized conchologically that it is hei'e accorded 



