90 



UNIVALVES. — TURBO. 



most elegant and graceful spiral the imagination can sug- 

 gest. The shells of this form are distinguished from those 

 something similar among the Strombi and Buccina, by 

 their having a circular or orbicular mouth, which is in- 

 deed the leading characteristic of all the species through- 

 out this genus. 



Among the species of the tapering or elongated Tur- 

 bines, may be mentioned the Turbo Imbricatus, Replica- 

 tus, Acutangulus, Duplicatus, and Terebra, which are 

 the principals of the division. 



The Turbo Ulvae is found adhering to the Ulva Lac- 

 tuca. The Turbo Perversus has its whorls contrary, and 

 dwells among moss on old walls in Europe, as does also 

 the Turbo Muscorum ; and the Turbo Tumidus is often 

 found in the woods of England. Among the fresh-water 

 species the Turbo Nautileus stands conspicuous; it is often 

 affixed to plants in stagnant waters. 



The species from the ocean are principally from the 

 South seas, and among them some of the rarest are found: 

 others are from the American and African oceans, whilst 

 others are the produce of the Indian and Northern seas; 

 and several species are to be met with in tlie Mediterra- 

 nean and European seas. 



TURBO. 



Obtusatus. 



Neritoides. 



*Littoreus. 



*Tumidus. 



*Rudis. 



*Lineatus. 



Muricatus. 



Lituus. 



Punctulatus. 



*Cimex. 



*Pullus. 



*Fasciatus. 



Personatus. 



Petholatus. 



Cochlus. 



Chrysostomus. 



Echinatus. 



Tectum-persicum. 



