CUMINGIA. Panama Shells. 287 



strias ; in the lower posterior area with unequal fine raised 

 radiating lines ; in the anterior half with radiating ribs, which 

 are ornamented with small thick vaulted scales ; beaks small, 

 prominent : umbones prominent, somewhat flattened : lunule 

 defined by the anterior ribs, a little depressed : ventral margin 

 scalloped anteriorly. It is allied to P. pholadiformis Lam. 

 Length .92 inch ; height .42 inch ; breadth .44 inch. 



Station. Unknown. 



Habitat. Panama; C. B. A. ! 

 1 specimen was obtained. 



478. Saxicava tennis! 



Synonymy. 

 Saxicava tennis (?) Sowb. in Proc. Zool. Soc. Lond. p. 88. Aug. 1834. 



The description of this species is too meagre to enable us to 

 identify oar shell confidently. 



Station. In soft stones near half tide level. 



Habitat. Pacosmayo and Lambeyeque ; Cuming ! Sowerby. 



Panama ; C. B. A. ! 



1 specimen was found in the same stone with Alodiola, sp. 

 indet. e. 



Family MACTKID^E. 

 479. Cumingia eoarctata. 



Synonymy. 



Cumingia eoarctata Sowb. Gen. pi. . f. 4. 



- Sowb. in Proc. Zool. Soc. Lond. p. 34. Mar. 1 833. 



- Reeve Conch. Syst. pi. 49. f. 4. Sept. 1841. 



- Hanley Supp. Wood Tnd. Test. pi. 12. f. 37. 1845? 



Station. Sandy, muddy bottom, 7 fathoms water ; Cuming ! 

 Sowerby. 



