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 stria; are stronger: diameter seven- 
eighths of an inch ; height an inch. 
This appears to be an intermediate species between the 
last and the next* FroraTr. Zizipliinus 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 defined 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 tenuis. 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, 
pL 8. f.2—Dorset Cat. pi. 22. f. 4. 
Shell 
