S20 



LIST OF IRISH TESTACEA. 



cidental variety of that shell. In comparing it 

 with specimens of the zizyphinus of the same 

 size, I find it is shorter in proportion to the 

 breadth of the lase ; and the apex is consi- 

 derably blunter. Length, six-eighths of an 

 inch ; breadth, seven-eighths. 

 One specimen of this shell was found at Holy- 

 wood, in Belfast Lough, by Miss Templeton 

 of Belfast, who kindly favoured me with it to 

 draw from. 



10. rtigosus. Plate xxiv. fig, 5. Shell subovate, milk-white, 



rather opaque, with four moderately raised 

 > whorls, which are well defined by the sepa- 

 rating line : from the aperture to the apex, 

 there is a pretty deep groove, which runs 

 spirally very close to the suture of the spire : 

 the body whorl is somewhat inflated^ on the 

 base of which there are three distinct spiral 

 lines, which rise in the edge of the outer lip, 

 and terminate where the lip is attached to the 

 columella. The whole shell is covered with 

 strong undulated striae : on the under part 

 they commence in the umbilicus (which is 

 pretty large and deep), and diverge towards 

 the sides ; in the upper part of the shell, they 

 in the same manner seem to diverge from 

 the apex. Aperture suborbicular, and not 

 much depressed ; inner lip rather strong, and 

 very slightly reflected near the umbilicus. 

 Found in drifted sand at Portmarnock by Dr 

 Turton, who says it is not uncommon. Size 

 of the shell scarcely an eighth of an inch. 



11. erythro- Donovan, Br. Sh. t. 155. f. 1. Tr. conicus. — 

 leucos. Montagu, Test. Br. p. 278. Tr. striatus. 



Rings-end, Dublin Bay, by Dr Turton ; rare. 



