124 



CONCHOLOGY. 



Shell. This genus appears to be the connecting Unk 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. Thirt3'-four 

 species. 



Monodonta biColor. 



M. pagodus. 



M. tectum-persicum. 



M. papillosa. 



M. coronaria. 



M. -^gyptiacea. 



M. carchedonius. ■ 



M. modulus. 



M. Listeri. 



M. tectum. 



M. labio. 



M. Australis, 



M. canalifera. 



M. viridis. 



M. fragarioides. 



M. constricta. 



M. tricarinata. 



Monodonta badia. 

 M articulata. 

 M. lugubris. 

 M. punctulata. 

 M. caniculata. 

 M. seminigra. 

 M. rosea. 

 M. lineata. 

 M. rugosa. 

 M. zebra. 

 M. reticularis. 

 M. trochlea. 

 M. atrata. 

 M. obscura. 

 M, concamerata. 

 M. odontis. 

 M. pulcherrima. 



4. Genus Turbo. PI. XI. 



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. Inhabits the 

 Indian and American seas. Fifty-one species. 



Turbo marmoratus. Turbo muricatus. 



T. imperialis. T. littoreus. 



T. torquatus. T. ustulatus. 



