190 HELIOID^E. 



their full growth in fifteen or sixteen months after they 

 are excluded. Moquin-Tandon enumerates this as one 

 of the eatable kinds, but he adds that it is not much 

 esteemed. The shell varies considerably in size. The 

 epiphragm is exceedingly thin and like silver-paper. 



It was known to Lister, who appropriately called it 

 " Cochlea maculata." Whether it is the species which 

 Linne* described as H. arbustorum is questionable, as his 

 diagnosis (" Testa umbilicata, convexa, acuminata, aper- 

 tura suborbiculari bimarginatdj antice elongata") is 

 scarcely applicable to this species. It is, however, a 

 Swedish shell ; and the present name has been adopted 

 by every author. 



C. Shell conical : mouth furnished with an internal rib : 

 umbilicus distinct. 



7. H. CANTIA'NA*, Montagu. 



H. Cantiana, Mont. Test. Brit. p. 422, and Suppl. p. 145, pi. 23. f . 1 ; 

 F. & H. iv. p. 50, pi. cxvi. f. 8, 9. 



BODY yellowish, with a rosy or blush-colour tint in front, 

 covered with small and numerous greyish tubercles : mantle 

 marked with close-set milk-white specks : tentacles greyish- 

 brown, widely diverging; upper pair rather thick at the base, 

 but becoming slender towards the point; bulbs nearly spheri- 

 cal : foot somewhat truncate in front, ending in a triangular, 

 swollen and keeled tail, with close transverse grooves at its 

 sides. 



SHELL subglobular, somewhat compressed both above and 

 below, rather thin and semi transparent, slightly glossy, yellow- 

 ish-white, with often a tint of reddish-brown or fawn-colour, 

 especially on the last whorl towards the mouth and on the 

 under side, and often marked with a white, but indistinct, 

 spiral band, which is placed a little above the periphery and 

 does not extend much beyond the last half of the body whorl*; 

 sculpture consisting of rather close, but irregular, curved trans- 

 verse striae : epidermis thin, covered in young and half -grown 



* Kentish. 



