300 Panama Shells. SOLENID^E. 



Of this species, hitherto unique in the Cumingian collection, 

 we obtained only 1 specimen of the convex valve. Col. Jewett 

 also brought a convex valve to Dr. Gould, and retained another 

 odd valve from Mazatlan. 



508. Corbllla . Sp. indet. a. 



This species has some resemblance to C. Taheitensis. We 

 obtained at Panama but 1 valve, which is probably immature. 



509. Corbllla . Sp. indet. b. 



Two left valves were obtained at Panama. 



Family SOLENID^E. 



510. Solecurtus affinis. Nov. sp. 



Shell much elongated, compressed cylindric, well rounded at 

 both extremities; ventral edge straight or slightly arcuated: 

 white beneath a deep yellowish brown epidermis : with unequal 

 striae of growth : beaks not prominent, a little behind the mid- 

 dle of the shell : umbones compressed along the middle : liga- 

 ment broad, with stout nymphasal callosities : teeth small, one 

 in the left, and two in the right valve. This is the analogue of 

 8. Caribceus. 



Length 2.25 inches; height .8 inch; breadth .55 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 

 10 specimens were collected. 



511. Soleii rudis. Nov. sp. 



Shell solid, straight or slightly recurved ; with the posterior 

 extremity abruptly truncated nearly perpendicularly; ante- 

 riorly with very thick rounded margins: white beneath a 

 brown deciduous epidermis, which is produced much beyond 

 the margins : with only indistinct striae of growth on the shell ; 

 with some radiating lines on the epidermis : beaks inconspicu- 



