FissuRELLA. Panama Sheik. 237 



35*. Fissurella inicrotrema. 



Synonymy. 



Fissurella microtrema Sowb. in Proc. Zool. Soc. Lond. p. 125. Nov. 1834. 



Miill. Synop. Nov. Test. Viv.p. 156. May 1836. 



Chenu 111. Conch, pi. 1. f. 11. 



Orb. Voy. Amer. Merid. Moll. p. 413. 1843. 



Keeve Conch. Icon. pi. 1. f. 44, Dec. 1849. 



The shells before us seem to be intermediate between this 

 species and F. rugosa Sowb., as these species are figured by 

 Sowerby and by Eeeve. We are indebted to Mr. Cuming for 

 specimens which enable us to determine the species. 



lotion. — Under stones at low water ; Cuming I Eeeve. 



Habitat — Real Llejos ; Cuming! Sowerby: also Eeeve. 



West Columbia ; Cuming I in sched. 



Panama ; C. B. A, I 

 We obtained 10 specimens in various stages of growth. 



368. Fissurella mus. 



Synonymy. 

 Fissurella mus Eeeve Conch. Icon. pi. 16. f. 120. Aug. 1850. 



Var. Two of our specimens difier from the type in having 

 the fissure shorter and the region around it more elevated. 



Station. — Unknown. 



Habitat. — Unknown ; Eeeve. 

 Panama ; C. B. A. I 

 8 specimens were collected. 



359. Fissurella nlgropunctata. 



Synonymy. 



Fissurella nigropunctata Sowb.inProc.Zool.Soc.Lond.p.l25.Nov.l834. 

 Miill. Synop. Nov. Test. Viv. p. 156. May 1836. 



JULY, 1852. 60 Anil. Lro. Nat. Hist. 



