VERTIGO. 261 



This species differs from F. pygmcea in being more 

 cylindrical, of a paler colour and nearly transparent, 

 and especially in the numerous and sharp transverse 

 stria3, as well as in not having any rib either outside or 

 inside the mouth. 



It is questionable whether the F. alpestris of Fe"russac 

 is the same as our shell, because he gave no description ; 

 and his original specimens appeared to me, from two 

 careful examinations which I made in 1860 and 1861, 

 to be the marsh variety (pallida) of F. pygmcea, and 

 not Alder's species. I have, however, no doubt of the 

 present species being the Pupa Shuttleworthiana of 

 Charpentier (Zeitschr. f. Malak. 1847, p. 148), having 

 compared with that naturalist the specimens I collected 

 in Switzerland. The Pupa borealis of Morelet from 

 Kamtschatka appears also to belong to this species. 



5. V. SUBSTRIA'TA*, Jeffreys. 



Alcea substriata, Jeffr. in Linn. Trans, xvi. p. 515. Pupa substriata, 

 F. H. iv. p. 108, pi. cxxx. f. 3. 



BODY grey of different shades : snout short, bilobed : tenta- 

 cles slender, cylindrical or club-shaped, and divergent : bulbs 

 equal to about one-fourth of their length : foot of a lighter 

 colour, thick, short, narrow and keeled at the tail. 



SHELL oval or subfusiform, rather thin andsemitransparent, 

 glossy, pale yellowish-horncolour, very strongly and obliquely 

 striate and almost ribbed in the line of growth, but less so on 

 the body whorl, which is faintly striate spirally : periphery 

 rounded : epidermis rather thick : whorls 4 J, very convex or 

 cylindrical, and suddenly increasing in bulk, the penultimate 

 whorl slightly exceeding in breadth the last, which occupies 

 about one-half of the shell : spire short, very abrupt and 

 bluntly pointed : suture remarkably deep : mouth semioval, 

 contracted or sinuous in the middle of the outer edge ; teeth 

 from four to six, viz. from one to three (usually two) on the 



* Slightly striate. 



