FISSURELLA. Panama Shells. 237 



35?. Fissurella microtrema. 



Synonymy. 



Fissurella microtrema Sowb. inProc. Zool. Soc. Lond. p. 125. Nov. 1834. 



Mull. Synop. Nov. Test. Viv.p. 156. May 183C. 



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



Orb. Voy. Amer. Merid. Moll. p. 473. 1843. 



Reeve Conch. Icon. pi. 7. 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. 



Station. Under stones at low water ; Cuming ! Eeeve. 



Habitat. Keal Llejos ; Cuming! Sowerby: also Eeeve. 



West Columbia ; Cuming ! in sched. 



Panama ; C. B. A. ! 

 We obtained 10 specimens in various stages of growth. 



358. Fissurella inns. 



Synonymy. 

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



Yar. Two of our specimens differ from the type in having 

 the fissure shorter and the region around it more elevated. 



Station. Unknown. 



Habitat. Unknown ; Eeeve. 

 Panama ; C. B. A. ! 

 8 specimens were collected. 



359. Fissurella nigropunctata. 



Synonymy. 



Fissurella nigropunctata Sowb. in Proc. Zool. Soc. Lond. p. 1 25. Nov. 1 834. 

 Mull. Synop. Nov. Test. Viv. p. 155. May 1836. 



