278 HELicnxas. 



showing the position and shape of the clausilium or 

 ossicle in several species. 



The Clausilice would seem to be more at home in the 

 South of Europe and Asia Minor than in any other part 

 of the world, judging from the statistics given by Char- 

 pentier in his Monograph on the genus, which was in- 

 serted in the * Journal de Conchyliologie ' for 1852. He 

 enumerated 235 species ; and this number has since been 

 added to by M. Schmidt, who has lately published an 

 exhaustive essay on the same subject. None of them 

 have been discovered in North America. Three species 

 are dextral and inhabit Transylvania. Some of our na- 

 tive Clausilice occur in the upper tertiary strata of Essex, 

 Suffolk, and Norfolk ; and their origin, as inhabitants of 

 Northern Europe, must therefore be very remote. 



A. Shell ribbed or striate transversely : clausilium having 

 its margin entire. 



1. CLAUSILIA HUGO'S A*, Draparnaud. 



C. rugosa, Drap. Tabl. Moll. p. 63. C. nigricans, F. & H. iv. p. 121, 

 pi. cxxix. f. 1, 2. 



BODY dark-grey or slatecolour, with a tinge of reddish- 

 brown, paler at the sides and underneath, indistinctly 

 tubercled in such a way as to appear wrinkled : tentacles 

 thick, minutely speckled with black ; upper pair rather close 

 together, with bluntly rounded bulbs which are darker than 

 the tentacles ; lower pair decidedly conical, and darker than 

 the upper ones : foot of a rather clear greyish colour, narrow- 

 ing gradually towards the tail, which is tumid and pointed. 



SHELL shaped like a long club, but somewhat attenuated 

 at the broader end, not thin and scarcely semitransparent, 

 rather glossy, light-brown or horncolour, with a few trans- 

 verse streaks and lines of white, marked with numerous and 

 close-set but somewhat irregular striae in the line of growth, 

 which are curved on the upper and flexuous on the lower 



* Wrinkled. 



