124 CONCHOLOGY. 
Shell. 'This genus appears to be the connecting link between 
the Trochus and Turbo; distinguished from the former, by an 
entirely rounded aperture, slightly depressed; from the latter, by 
the toothlike projecting angle the truncated columella occasions at 
the base; an operculum. Inhabits the Chinese seas, Thirty-four 
species. 
Monodonta bicolor. Monodonta badia. 
4, Genus Turbo. 
M. pagodus, M articulata. 
M. tectum-persicum. M. lugubris. 
M. papillosa. M. punctulata. 
M. coronaria. M. caniculata. 
M. Agyptiacea. M. seminigra. 
M. carchedonius. M. rosea. 
M. modulus. M. lineata. 
M. Listeri. M. rugosa. 
M. tectum. M. zebra. 
M. labio. M. reticularis. 
M. Australis. _ M. trochlea. 
M. canalifera. M. atrata. 
M. viridis. M. obscura. 
M. fragarioides. M,, concamerata. 
M. constricta. M. odontis. 
M. tricarinata. M. pulcherrima. 
PL At. 
Animal. Very similar to that of Trochus, the sides sometimes 
ornamented with tentacular appendages, varying in number and 
form; head proboscidiform ; tentacula thin and setaceous. 
Shell. Depressed conical, or subturreted; sometimes umbili- 
cated, frequently carinated at its circumference; interior pearly; 
aperture round or depressed, the middle of external edge hollowed ; 
edges rarely joined by a callosity; columella arched, rarely 
twisted, not truncated at the base; an operculum. JInhabits the 
Indian and American seas. Fifty-one species. 
- Turbo marmoratus. Turbo muricatus. 
T. imperialis. T., littoreus. 
T. torquatus. T. ustulatus. 
