UNIVALVES — TURBO. 151 



The shells of the seventh division are celebrated for 

 the beauty and variety of their coloring ; the T. phasianus 

 in particular, has its colors disposed in resemblance of 

 the plumage of the Pheasant. 



A considerable variation in form characterizes the 

 eighth division ; the shells being obtuse at both ends. 



The similarity which exists between the shells of the 

 ninth division and those of the corresponding class in the 

 Strombus and Buccinum, is strikingly observable in 

 the T. imbricatus, T. replicatus, T. acutangulus, T. du- 

 plicatus, and T. terebra; but the circular form of the 

 mouth distinguishes them from the tun'eted species 

 of the other two genera : their shape is that of a 

 well proportioned spire, with thirty or forty whorls 

 gradually diminishing, and terminating in a very acute 

 point. 



The last division contains the depressed species, of 

 which may be particularised the T. nautileus: this 

 shell is often found atiixed to plants in stagnant waters. 



Among the rare and beautiful species of the Turbines 

 the T. scalaris and T. phasianus are the most conspicu- 

 ous. The value of the T. scalaris depends upon its size 

 and perfection, choice specimens having been sold for 

 £30, while inferior may be purchased at 10s. The greater 

 number of those species which are found in the South 

 Seas are extremely rare. 



The generic name, Turbo, is derived from the Latin, 

 and has the same signification with the Greek derivative 

 of the preceding genus. 



