12. Nassa. Lam. 



Oval ; mouth terminated 

 below by a deep notch. 

 PL 10, fig. 23. 



13. Purpura. (1) Lam. 

 Oval. Pi. 11, % 2. 



a. Purpura. 



b. Monoceros, Montf. 



. Ricinella, Lam. 



14. COxNCHOLEPAS. (2) 



Lam. 



Patelliform ; outer lip 

 dentated ; spire very 

 small : operculum oval, 

 horny. PI. 10, fig. 17. 



15. Cassidaria. Lam. 

 Morio: Montfort. 



Conical ; mouth effu- 

 sive ; notch terminating 

 in a small canal reflected 

 to the left at the base. PI. 

 11, fig. 6. 



( 40 ) 



Columella covered wit h 

 a plate. 



" 1 



[Entomostoma ta . ) 



Marine. 



Y. Animal, p. 69. 



Columella naked, flat- Marine. 

 tened. V. Animal, p. 69. 



A spine projecting from the base of the outer lip. 

 PI. 11, fig. 3. 



Lip of the columella toothed. PI. 11, fig. 4. 



A furrow from the 

 cavity of the summit ter- 

 minating between the 

 two anterior teeth of the 

 mouth. 



Columella covered by 

 a simple plate formed by 

 the left lip. 



Marine. 

 Coast of Peru. 

 Animal unknown. 



Marine. 



V. Animal, p. 



70. 



16. Cancellaria, (3) Lam. 



Ova), last whorl ven- Columella with com- 

 tricose, right lip furrow- pressed folds and a plate 

 ed within the mouth ; formed by the inner lir 

 almost entire at the base. 

 PI. 11, fig. 6. 



Marine. 



V. Animal, p. 69. 



:>. 



(1) Foss. at Courtagnon. 



(2) Lamarck placed the Conchokpas with the Patella, but most zoologists seem 

 now to agree with Bruguiere in approaching it to the Buccinum, since, according 

 to Dombey's report, the animal is furnished with a tendinous operculum, which 

 only partly closes the shell. The muscular impression, like a large horse-shoe open 

 in front, has some resemblance to that of the Calyptraa. 



(3) Foss. at Grignon; Piedmont ; Environs of Florence. 



