189 
TROCKUS. TOP-SHELL. 
about half the surface of the base white, the latter appear¬ 
ing as if wont flat: aperture roundish-oval, with a tooth- 
iie projection in the middle of the pillar, and sometimes 
a small indenture like an incipient perforation behind it : 
diameter an inch ; height an inch and a quarter. 
On many rocky.coasts. v. v. 
i /. Trochus Ziziphinus. Livid Tojj-shcll . 
Lister , pi. 616. f. 1— Pennant , pi. 83. f. 1— Da Costa , 
3. f. -— Donovan , pi. 52— Dorset Cat. pi. 16. f. 3, 4. 
Shell conic, strong, finely pointed, with seven or eight 
spires, which are separated by a raised smooth 11 attish cir¬ 
cular belt, and obscurely striate or ridged in the same di¬ 
rection, sometimes slightly beaded at the very tip which is 
purple; the base obscurely striate circularly, pnd very 
friely wrinkled across : color livid white or pale purplish 
red, with red or dark purple longitudinal blotches, which 
are wry distinct on the belts and at the base, crossing the 
baregular banded manner ; inside white, perlaceou 
epake: aperture a little flattened and angular, with asligl 
projection where the pillar begins to thicken : diamet< 
hardly an inch; height something more. 
Variety A. Quite white, with the volutions more di¬ 
stinctly defined. 
Variety B. With the volutions separated by a hollow 
fcraad deep division, and wrought with indistinct spiral 
fBges : from the lip to the pointed end also runs a deep 
concave groove. 
Trochus discrepans. Brown , JVern. Soc. ii. pi. 24. f. 4. 
On mo 3 t rocky coasts. The variety B, was found in Bel¬ 
fast Lough, by Miss Templeton, v. v. 
tf. Trochus Conulus. Cone Top-sli ell. 
Pennant, pi. S3, f. 2— Donovan , pi. 8 . f. 3. 
Shell thin, semitransparent, regularly conic and taper- 
to a very fine point: spires ten, strongly striate circu- 
!»'iy, and separated only by a fine line, the five or six up¬ 
per ones strongly beaded, and all of them more or less ob¬ 
scurely so: color livid white or pale horn-color, faintly 
marked with longitudinal- purple blotches, which are only 
well 
