22 CONCHOLOGY. 
Solarium granulatum. Solarium levigatum. 
S. perspectivum. S. stramineum. 
S. hybridum. S. variegatum. 
S. luteum. 
2. Genus Trochus. Pl. XI. 
Animal. Spiral, having the sides of the body often ornamented 
with digitated or lobed appendages, and provided with a short 
foot, rounded at its two extremities; head provided with two 
tentacula more or less elongated, having the eyes upon a dilation 
of their external base; mouth without superior tooth, but fur- 
nished with a spiral lingual band. 
Shell. Marine, found in almost all parts of the world, some 
smooth, others knotted, spined, tuberculated, or undulated ; thick, 
generally pearly, spire sometimes depressed, at others elevated and 
pointed at the summit, sharp or carinated at its circumference, fre- 
quently umbilicated, not always; aperture transversely depressed, 
the margins not united at the upper part; columella arched and 
twisted, often projecting forward; operculum horny, thin, with 
numerous spiral whorls, increasing from the centre to the circum- 
ference. Inhabits the European seas. Ninety-nine living species. 
Eight fossil. 
Trochus imperialis. Trochus jujubinus. 
T. longispina. T. Javanicus. 
T. solaris. T. annulatus. 
T. Indicus. T. doliarius. 
T. radians. T. granulatus. 
T. pileus. T. granatum. 
T. calyptreformis. T. moniliferus. 
T. fimbriatus. Tres: 
T. brevispina. T. ornatus. 
T. rotularius. T. bicingulatus. 
T. stella. T. calliferus. 
T. stellarius. T. umbilicaris. 
T. asperatus. T. undatus. 
T. rhodostomus. T. Pharaonis. 
T. spinulosus. T. sagittiferus. 
