228 Panama Shells. CALYPTR^EID,E. 



Habitat Unknown ; Deshayes. 



Mazatlan ; Melchers ! Menke. 

 Mazatlan ; E. Jewett ! Gould MSS. 

 Taboga and Panama ; C. B. A. ! 



28 specimens were collected. 



According to Dr. Krauss, C. hepatica occurs at the Cape of 

 Good Hope. We have several specimens, collected at the Cape 

 by Dr. K., of his convex variety, which differs from our shells 

 in having the septum very deeply placed, and the beak very 

 prominent. The depressed variety figured by Dr. K. may more 

 nearly resemble the Pacific shell, but we have no specimens for 

 comparison. Probably, however, the Cape shells belong to a 

 distinct species : but as the habitat of the original type was not 

 known, and as the original description is applicable to both, 

 we must leave this question undecided. 



347. Crepidula incurva. 



Synonymy. 



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



Lond. p. 40. May 1834. 



Brod. in Trans. Zool. Soc. 



Lond. pi. 29. f. 6. 1835. 



- Mull. Synop. Nov. Test. 



Viv. p. 150. May 1836. 



Orb. Voy. Amer. Merid. 



Moll. p. 468. 1843. 



Station. On dead shells dredged from sandy mud, at a depth 

 ranging from 6 to 10 fathoms ; Cuming ! Broderip. 



Our specimens were found adhering to living shells at and 

 near low water mark. Its favorite station was on the shell 

 which we have mentioned as Trochus sp. indet. b, almost every 

 one of which supported one or more of this Crepidula. Turbo 

 saxosus was next in the frequency with which it furnished 

 specimens. The species was found also on Columbella rugosa, 

 C. varia, Bmcinum ringens, Purpura tecta, P. undulata, Trochus 



