ZONITES. 103 



5. Z. PU'RUS,* ALDER. PL. VII. 



Body slightly transparent, yellowish-grey very faintly tinged 

 with slate-colour, mottled with minute black specks, closely 

 tuberculate ; tentacles very long, rather slender, somewhat 

 diverging at their base, of a slaty-grey finely spotted with 

 black, yellowish towards the tips, bulbs small ; foot narrow, 

 slightly pointed in front, rounded behind, finely speckled with 

 dark grey. 



" Shell compressed, rather more convex above than below, 

 very thin, not very glossy but semitransparent, light horn- 

 colour, with a yellow or reddish tinge on the upper side, exqui- 

 sitely sculptured transversely by numerous curved striae, and 

 spirally by still finer and almost microscopic lines, the intersec- 

 tion of which gives the surface a reticulated appearance ; 

 epidermis thin ; whorls 4, convex, but dilated laterally, the 

 last occupying scarcely one-half of the shell ; spire slightly 

 raised ; suture moderately deep, puckered by the lines of 

 growth ; mouth nearly round, and not much interrupted by the 

 penultimate whorl ; outer lip not very oblique ; umbilicus 

 narrow, but deep, disclosing all the internal spire." J&.C., vol. i. 

 p. 165. 



Inhabits woods, under stones and among moss and 

 decaying leaves throughout Great Britain, but it is a 

 local species. The shell is very much smaller than 

 that of Z. nitidulus, and the umbilicus is proportion- 

 ably narrower. 



Var. margaritacea. Shell pearl-white, and nearly trans 

 parent, B.C. It is frequently found with the type. 



6. Z. RADIA r TULUS,t ALDER. PL. VII. 



Body dusky ; tentacles blackish, upper pair very thin, lower 

 pair very short ; foot extremely narrow, ending in a rather sharp 

 point behind, blackish above, light grey spotted with black on 

 its sides. f . 



* Clear. t Slightly rayed. 



