126 GENUS XXVIII. TURBO. 



Linngeus describes 49 species, Gmelin has added 53, and 



Dr. Turton 51. Total, 152. 



Lamarck divides this genus into five, as follow : 



Turbo. Shell conic or slightly tapering ; the aperture entire 

 and round, and not toothed ; the two lips always dis- 

 joined in the upper part (see Turbo Cochins, pi. 8./. 99). 



Cyclostoma. Shell wheel-shaped or conical, without longi- 

 tudinal ribs, the last whorl larger than the others ; the 

 aperture round, the margin circular and uninterrupted 

 (see T. Delphinus, pi 8. /. 98). 



ScALARiA. Shell tapering, with acute longitudinal raised ribs 

 running down all the length of the spire ; the aperture 

 nearly circular, the margin uninterrupted and reflected 

 (see T. scalaris, pi. 8. /. 100). 



TuRRiTELLA. Shell tapering ; the aperture rounded, with 

 the two lips disjoined in the upper part, and a notch in 

 the right lip (see T. Terebra, pi. 8. /. 102). 



Pupa. Shell cylindrical, the last turn of the spire, somewhat 

 produced, not being larger than the preceding ; the aper- 

 ture irregularly roundish or oval ; the margin continued 

 circularly (see T. Uva, pi. 8. /. 101). 



Mr. Parkinson observes that the genus Cyclostoma contains 

 both sea and land shells, which he divides, and calls the sea 

 shells Delphiimla, and the land shells Cyclostoma. 



