90 HELICIDA. 
elongated, smoother and more transparent than Var. 
dubia, pale brown, frequently resembling C. laminata 
in smoothness and transparency.” 
2. C. Roupait (after Rolph). 
Fusiform, thinner than the last species; reddish or yel- 
lowish brown, occasionally streaked with white; strongly 
striated ; whorls nine to ten; the first two or three upper 
whorls are nearly of the same breadth, forming a short 
cylinder; apew blunt; mouth quadrangular; plications as 
in last species, but there are often two or three small teeth 
between the columellar folds; outer lip inflected; basal 
crest short and curved; umbilicus indistinct; clausiliwm 
oblong, regularly curved, slightly contracted above. 
This is a rare and local species, found only in a few 
localities in some of the southern counties of England. 
Dr. Jeffreys sdys: “From C. rugosa and its 
variety dubia this differs in being more ventricose and 
of a lighter colour, as well as in having much coarser 
striz, which impart to the last-mentioned shell a de- 
cussated or slightly granular appearance. The mouth 
of the shell n C. Rolphii is, besides, larger and 
broader.”’ 
3. C. BIPLICATA (having two folds). 
Fusiform, dull, but with a slight iridescence; rufous 
brown streaked with white; strongly striated; whorls 
twelve to thirteen ; mouth oval, angular, contracted below, 
