CLAUSILIA. 281 



with a lens, or of a few striae near the mouth. It in- 

 habits the North of France, as well as every other part 

 of the Continent, and may be expected also to be found 

 in Great Britain. 



2. C. Rolph'ii ^, Gray. 



a Rolphii, Gray in Turt. Man. L. & F.W. Sh. p. 71, f. 54. C. plicatula, 

 F. & H. iv. p. 120, pi. cxxix. f. 3. 



Body dark-brown or dusky, with a reddish hue above, grey- 

 ish-brown on the sides and underneath; tubercles blackish, 

 arranged in very close lines : mantle thick, yellowish-white, 

 with small specks of pure white : tentacles greyish-broT\Ti ; 

 upper pair rather short and stout, nearly cyhndrical as far as 

 the bulbs, slightly shagreened and covered with black dots, 

 which are so minute as scarcely to be visible with a lens of 

 ordinary power, the bulbs thick and nearly spherical ; lower 

 pair exceedingly short and of a paler hue than the others: 

 foot very long, narrower in fronts ending in a slightly rounded 

 tail ; sole greyish-white. 



Shell fusiform, rather thinner than the last species but 

 scarcely semitransparent, shghtly glossy, reddish- or yellow- 

 ish-brown, wdth occasionally a few white lines dispersed here 

 and there over the surface, marked with strong, sharp and 

 somewhat regular transverse striae, of which there are from 

 sixty to seventy on the body of the last whorl ; these striaB 

 are curved on the upper and somewhat flexuous on the lower 

 part of the shell, becoming fewer and consequently more re- 

 mote but stronger towards the outer hp; spiral striae very 

 indistinct and scarcely perceptible : periphery angular : epi- 

 dermis rather thick : ivhorls 9-10, tumid, but somewhat com- 

 pressed, the last being rather less than one-third of the shell 

 and a little narrower than the two preceding whorls ; the two 

 or three first whorls are nearly of the same breadth and form 

 a short cylinder: sjyire abruptly tapering and obtuse at the 

 point : suture rather obhque, not very deep : mouth subqua- 

 drangular, sinuous on the outer side and effuse below ; teeth as 

 in C. rugosa, but in the present species there are often two or 

 three small teeth or ridges between the columellar folds, and 

 the lower of these folds is less prominent but often cruciate : 



* Named after Mr. Eolph, an EiigHsh conchologist. 



