90 HELICIDJ3. 



elongated, smoother and more transparent than Var. 

 dubia, pale brown, frequently resembling C. laminata 

 in smoothness and transparency." 



2. C. ROLPHII (after Eolph). 



Fusiform, thinner than the last species ; reddish or yel- 

 lowish brown, occasionally streaked with white ; strongly 

 striated ; ivhorls nine to ten ; the first two or three upper 

 whorls are nearly of the same breadth, forming a short 

 cylinder ; apex 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 ; clausilium 

 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 says : " 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 

 striae, which impart to the last-mentioned shell a de- 

 cussated or slightly granular appearance. The mouth 

 of the shell in (7. 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, 



