TRO CII US. TOP-SHELL . 
US7 
from each other, and slightly marked by the line of sepa¬ 
ration, depressed and blunt at the tip where there is gene¬ 
rally a small perforation, obscurely striate circularly: co¬ 
lor mostly dark dull green, with longitudinal waved stripes 
or zigzag spots or lines of a darker color varying to light i 
or dark purple : the base nearly smooth and more strongly 
marked with stripes or spots: aperture a little compressed 
-id something angular, pcrlaceous within : perforation 
large and deep, reaching to the top, through which it is 
mostly pervious: the young shells are very Hat: diameter 
three-quarters of an inch j height nearly as much. 
On most coasts, v. v. 
t 3. Trochus cinerarius. Asli-colored Top-shell. 
Lhtcr, pi. 641. f. 31— Da Costa , pi. 3. f. 6*— Donovan , 
pi. 7-1, two upper and lower fig.— Dorset Cat. pi. 10'. 
f. 11,44 " 
Shell with five or six spires, which are a little rounded 
and well defined by the line of separation, tapering to a 
ray {lie point which is generally of a ebesnut color, dis r 
tinctly marked with numerous fine raised circular lines : 
color grey, often of a blucish or dull crimson cast, with 
narrow oblique pjpsc-rset longitudinal bl ow n lines j the base 
closely and strongly striate, and appearing as if minutely 
tubercled : aperture a little compressed and somewhat an¬ 
gular, perlaceous within, with a small but deep perfora.- 
tion: the young shells are flattish but pointed, with a 
broad base*: diameter five-eighths of an inch 3 height hardly 
as much. 
It is easily distinguished from the last by its grey color, 
especially at the base, by the more distinctly raised volu¬ 
tions, the minute brown tip, and regularly striate base, 
ivhich is generally a little rough to the touch, 
0 a most sandy shores, v , v, 
• 4. Tvochus tumidus. Tumid Top-shell. 
Montagu, pj. 10. f. 4— Dorset Cal, ph * 16, f, 9, 10— 
fialkr , f. 58 . 
Shell conic, with five or six spires, and sometimes seven, 
which are well defined and a little flattened at the top of 
pack, tapering to a very fine poipt, marlycd with, numeroua 
. * r • t pjctreipcly 
