226 Panama Shells. 



the middle, with a small sinus at the left, a broad one at the 

 middle of the edge, and none at the right side. 



Length .23 inch : breadth .14 inch ; convexity .07 inch. 



Station. On Cerithium irroratum, q. v. 



Habitat. Taboga ; C. B. A. ! 



This species was not observed until after the shells arrived 

 here. When cleaning a quantity of C. irroratum, 45 specimens 

 were obtained. 



344. Crepidula echinus. 



Synonymy. 



Cabjptrcea (Crepipatdla) echinus Brod. in Proc. Zool. Soc. 



Lond. p. 39. May 1834. 



Brod. in Trans. Zool. Soc. 



Lond. I. 203. pi. 27. f. 1. 1835. 



Miill. Synop. Nov. Test. 



Viv. p. 148. May 1836. 



Crepidula Lam. An. sans Vert. VII. 



650. No. 23. (Desh. ed.) 1838. 



Lam. An. sans Vert. III. 

 Pt. 1. p. 239, No. 23. 

 (Desh. ed. tert.) 1841. 



Station. Under stones at low water. 



Habitat. Lobos I. ; Cuming ! Broderip- also Miiller. 



Peru ; Deshayes : also Jay. 



Panama ; 0. B. A ! 

 18 specimens were obtained. 



345. Crepiclula excavata. 



Synonymy. 



Calyptrcea (Crepidula) excavata Brod. in Proc. Zool. Soc. 



Lond. p. 40. May 1834. 

 Brod. in Trans. Zool. Soc. 



Lond. I. 205. pi. 29. f. 7. 1835. 



