new Species <?/ Helix. 301 



and running with the keel above, one around the umbilical 

 depression, and one intermediate. Spire depressedly con- 

 vex, suture well marked, apex rounded. Whorls seven, 

 closely wound, side of tlie last very oblique below and flat- 

 tened, becoming rounder near the aperture, where it descends 

 very slightly. Aperture wide, semiovate, very oblique, and 

 slightly reflected on the mai-gin. Peristome not thickened, 

 continuous over the parietal side. The internal barriers are 

 not visible on looking into the aperture. The parietal vertical 

 lamina is simple, with only a slight horizontal support above 

 on the posterior side ; a very short double- knobbed horizontal 

 parietal lamella is situated immediately below it. Palatal 

 plicEe double, in two rows, the two apical or highest in posi- 

 tion being united together by a low ridge ; the posterior row 

 are somewhat obliquely arranged. 



Major diam. 20, minor diam. i7'o ; alt. axis 8*5 millim. 



This fine large species is quite distinct ; the arrangement of" 

 the palatal plicai is similar to that of P. macromphalus and 

 P. plectostoma^ while the junction of the two highest palatal 

 plicEe being like that in P. Andetsoni, its position is inter- 

 mediate between them {vide the characters of this genus given 

 by me in the P. Z. S. 17th November, 1874, p. 612). 



It is unfortunate that we do not know the exact locality 

 where this species was obtained ; all I can gather is that it 

 was sent to Mr. Fulton by a correspondent who, as he says, 

 " knows nothing about shells, does not collect them himself, 

 but gets natives to do so ; the species came to me with Cyclo- 

 phorus Pearsoni, siamensis^ and zebrinus^ Helix [Plectopylis) 

 plectostoma^ and Spiraculum hispidum.^^ All these are Khasi 

 Hill shells, and the last particularly abundant on the lime- 

 stone at the southern base of those hills. But when shells 

 are collected in this way they may come from any part of 

 Assam, as the recipient gets them in all probability of every 

 one he comes across, and to him distribution is of no impor- 

 tance. Dealers in shells would much enhance the value of 

 their collections if they would be more particular on this 

 point ; very frequently the habitat given is quite worthless 

 and terribly misleading. I therefore give Khasi Hills with 

 a query until its true habitat shall be given and on good 

 authority. 



