16 



HELICID.i:, 



"The parietal vertical lamiua is simple, with no distinct hori- 

 zontal plica below it, as in macroraplialus ; the palatal plicae are 

 six in front, four behind, the basal one in front thin and longer 

 than the others." (Godirin-Aitsten.) 



Diam. maj. 5, miuor 4 millim ; alt. 2-o millim. 



Hab. Sikkiiu: Dnrjeeling (XeviU, Stoliczl-a, Ilunr/erford); Eun- 

 gun Valley (Blanford) ; India: Naga Hills (Beddome) ; Laiseu 

 Peak, Munipur (Godwin- Atisten). 



Lt.-Col. Godwin- Austen, in describing the present species, 

 expi'epses the opinion that it is doubtless the form minor of 

 P. macromjilmlus alluded to by Blanford in J. A. S. B. 1870, 

 p. 18. 



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

 deflesed below anteriorly, having posteriorly two minute denticles, 



one above and one belo\^•. A very thin, free horizontal fold occurs 

 below the vertical plate, revolving as far as the parietal ridge at 

 the aperture, where it becomes much atteiuiated (see tig. 27/) ; 

 this fold appears to be somewhat variable, for in a specimen in 

 Mr. Pousonby's collection, shown in tig. 27 1, it is very short, and 

 scarcely extends beyond the vertical plate ; \\h\\e in another 

 specimen, also in Mr. Ponsonby's collection, sliown in fig 27 d, it 

 is absent altogether. Lt.-Col. Godwin-Austen, in his description 

 of the species, states : " Parietal vertical lamina simple, with no 

 distinct horizontal plica below it." 



