300 CARYCHIID^. 



excluded from the category of land-shells and placed 

 with those having a marine habitat ^, there only remains 

 a single genus^ containing a solitary species, for present 

 consideration. This is one of our smallest terrestrial 

 Mollusca. 



There are several points of resemblance between this 

 family and the Limnceida. The contractility of their 

 tentacles and the position of the eyes and reproductive 

 organs are nearly the same in each of these families; 

 and the only British member of the Caryckiidce is semi- 

 aquatic in its habits and can live a long time under 

 water. Every individual of both families is male as well 

 as female. 



Genus CAUY'CHIUM f, Miiller. PL VIII. f. 1, 2, 3, 4. 



The characters of the body and shell are given in the 

 above definition of the family. 



Carychium mi'nimum X, Miiller. 



C. minimum, Miill. Verm. Hist. pt. ii. p. 125 ; F.& H. iv. p. 198, pl.cxxv. f. 6. 



Body bilobed iii front and rounded behind, transparent, 

 yeUowish-white : snout as long as the tentacles and triangular : 

 tentacles very close together, thick and conical, with somewhat 

 rounded extremities : eyes rather prominent, exceedingly black 

 and distinct : foot rounded in front, very finely speckled with 

 black and milk-white, terminating in a blunt and thick tail. 



Shell subfusiform, transparent, but not very thin, glossy, 

 whitish, finely and closely striate in the line of growth, with 

 a few obsolete or indistinct spiral hnes ; the transverse striae 

 are flexuous and stronger towards the suture, and they are 

 sometimes partly decussated by the spiral hnes in such a 



* I accidentally omitted to notice, in mj account of the Slugs, that one 

 of them also ( Onchidium Celtician) is marine. 



t From its resemblance to a Murex or kind of whelk. \ Smallest. 



