190 TROCHUS. TOP- SHELL. 



well defined at the base of the larger volution ; inside 

 transparent, perlaceous ; the base and aperture as in the 

 last, but the circular striae are stronger : diameter sever/- 

 eighths of an inch ; height an inch. 



This appears to be an intermediate species between the 

 last and the next. From Tr. Ziziphinus it differs in having 

 the cone extended to ten volutions, the upper ones only of 

 which are distinctly beaded, in the total want of the flat- 

 tened belt, and in the stronger and better denned circular 

 ridges : it is also a much thinner shell. From the next it 

 evidently differs, in not having the base so very tumid and 

 rounded, in not being regularly beaded throughout, nor so 

 remarkably thin and fragile, and in wanting the chains of 

 circular red spots at the base. 



Dredged up at Bray, near 'Dublin, v. v. 



9. Trochus papillosus. Granulated Top-shell Fig. 62. 



Da Costa, pi. 3. f. 3 Donovan, pi. 127 -Dorset Cat. 

 pi. 16. f. 5, 6. 



Trochus tennis. Montagu, pi. 10. f. 3. 



Shell conic, finely pointed, transparent, extremely thin 

 and brittle : spires eight, rather rounded, with hardly any 

 distinguishable separating line; the larger volution re- 

 markably rounded and tumid at the base, the next more 

 tumid than the rest, and all of them finely granulated or 

 beaded throughout : color pale reddish brown, with obscure 

 red spots in longitudinal lines ; the base very convex, cir- 

 cularly striate, and slightly wrinkled across, marked with 

 numerous concentric rows of chain-like purplish-red spots : 

 aperture a little angular, perlaceous within ; pillar-lip pearly, 

 reflected so as to form a slight groove behind it : diameter 

 about an inch ; height rather more. 



In comparing our foreign specimens of Tr. Granatum, 

 from New Zealand, with the native ones from Bray in Ire- 

 land and Devonshire, we can perceive hardly a shade of 

 difference, v. v. 



10. Trochus exiguus. Crimson-tipped Top-shell. 



Lister, pi. 621. f. 8 Da Costa, pi. 2. f, 4 Donovan, 

 pi 8. 1 2 Dorset Cat. pi. 22. f. 4. 



Shell 



