TURBO. 859 



DENTicuLATUS, 102. Shell conical, small, with 

 oblique ribs, and the whirls denticulated at 

 the suture. 

 Turbo denticulatus. Montagu Test. p. 315. Maton and 

 Racket, in Lin. Trans, viii. p. 173. 

 Inhabits the sea at Weymouth. Montagu. 

 Shell nearly a quarter of an inch long, and about half as broad. 

 Mr. Montagu says it very much resembles T. coniferuSf 

 from which it differs in having the aperture more round and 

 not properly marginated, but only thickened by a rib ; it is 

 much more conical, the ribs are stronger, less numerous, and 

 form deeper denticulations at the suture ; the interstices of 

 the ribs are also destitute of stride, and sub-pellucid, and 

 what seems the strongest specific distinction is, that the ribs 

 do not undulate, but run oblique to the left, from the aper- 

 ture to the apex. 



ARCUATUS. 103. Shell turreted, small, with conti- 

 nuous ribs, which are arched over at the su- 

 ture. 



Turbo marginatus. Montagu Supp. p. 128. 

 Inhabits the coasts of Guernsey. Mojitagu. 

 Shell about three-eighths of an inch long, and one-fourth as 



broad. Mr. Montagu says it somewhat resembles T. coni- 

 ferus, but is more slender, and the ribs are regularly arched 



over each volution, and not abruptly finished at the top, as in 



that shell. The name of marginatus was before occupied 



by Chemnitz for another species. 



STRIATUS. 104. Shell sub-turreted, minute, with 

 the whirls faintly ribbed at the upper end, 

 and thickly and regularly striated trans- 

 versely. 



Turbo striatus. Adams in Lin. Trans, iii. p. 66. t. 13. 

 f. 25 and 26. Montagu Test. p. 312. Maton and 

 Racket, in Lin. Trans, viii. p. 173. 

 Turbo Shepeianus. Adams s Micros, p. 638. t. 14. f. 22. 

 Walker's Minute Shells, f. 49. 



Inhabits the roots of marine Alga on the shores of Cornwall 

 and Devon. Montagu. Pembroke. Adams. Neighbour- 

 hood of Swansea, and South of Ireland ; not uncommon. 

 L. W. D. 



Shell about one-eighth of an inch long, and the breadth is ra- 



