300 CARYCHIID^E. 



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 Limnceidce. 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 Carychiidce 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 CARY'CHIUM f, Muller. 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 J, Muller. 



C. minimum, Mull. Verm. Hist. pt. ii. p. 125 ; F. & H. iv. p. 198, pi. 

 cxxv. f. 6. 



BODY bilobed in front and rounded behind, transparent, 

 yellowish- white : snout as long as the tentacles and tri- 

 angular : 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 lines ; the transverse striae 

 are flexuous and stronger towards the suture, and they are 

 sometimes partly decussated by the spiral lines in such a 



* I accidentally omitted to notice, in my account of the slugs, that 

 one of them also (Onchidium Cdticum) is marine. 



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



