LIST OF IRISH TESTACEA. 



519 



TROCHUS. 



1. Magus. Donovan, Br. Sh. t. 8. f. 1. — Montagu, Test. 



Br. p. 283. Portmarnock, rare ; not un- 

 common in Donaghadee. 



2. cinereus. Donovan, Br. Sh. 1. 155. f. 2. — Montagu, Test. 



Br. p 289. Dublin Bay, veiiy rare. 



3. lineatus. Donovan, Br. Sh. t. 74. large and two smaller 



figures — Moiitagu, Test. Br. p. 284. T. ci- 

 nerarius. Dublin Bay, Portmarnock, and 

 Balbriggiug ; very common, 



4. umbiiica- Montagu, Test, Br. p. 286.^ — Donovan, Br. Sh. 



tus. t. 74. fig. med. Portmarnock, Dublin Bay, 



and Killough, common. 



5. tumidus. Montagu, Test. Br. p. 280. t. 10. f. 4. Port- 



marnock, and Dublin Bay, of a large size. 



6. crassus. Donovan, Br. Sh. t. 71- — Montagu, Test. Br. 



p. 281. Dublin BajT-, one specimen ; plenti- 

 ful on the rocks at Limerick; and not un- 

 common on the rocks at Killough. 



7. papillosus. Donovan, Br. Sh. t. 127. — Montagu, Test. Br. 



p. 275. t. 10. f- S. IV. tenuis. One speci- 

 men in Dubhn Bay; and fine specimens have 

 been taken by the dredge at Bray, by Mr 

 Nuttal. 



8. Zizyphi- Donovan, Br. Sh. t. 52. — Montagu, Test. Br. 



nus. p. 274. Dublin Bay, and Portmarnock, ; 



plentiful. 



9. discrepans. Plate xxiv. fig. 4. Shell cOnic, terminating in 



rather an obtuse point, with seven rounded 

 volutions, well defined by a hollow, broad, 

 and deep division : from the lip to the apex 

 runs a deep concave groove ; the whole shell 

 is wrought with indistinct spiral ridges. In 

 other respects, this shell agrees with the Tro- 

 chus zizyphinus, and is probably only an ac* 

 L 1 2 



