( «5 ) 



FAMILY I. TROCHOIDA, 



1. Turbo. Lin. 



Shell turbinated, mouth 

 round. 



GENERA. 



a. Turbo, Lam. (J) 



Membranous wings 2 Long tentacula, 

 on the side of the foot. 

 PI. 17, fig. 6, 7, 8, 9, 

 1 10. 



\b. Delphinula, Lam. 



iz Jc. Vermicularia. PI. 

 'l\ 19, fig, 8. 9. 



id: Turritellaj Lam. 



e. Scalaria,, Lam. (2) 

 PI. 17, fig. 1. 



- 



i 



■ 



Eyes on stems at the 

 outer bases of the tenta- 

 cula. 



2 Triangular, flattened, Ditto, 

 small tentacula. 



2 Long, slim tentacula. Ditto. 



(1) To these belong the thick, strong opercula, so frequently found in collections, 

 which were formerly employed in medicine under the name of unguis odoratus. 



(2) The mouth is encircled by a callous pad, which the animal repeats from 

 space to space as its shell increases, so as to give the appearance of ladders. 



