40 Panama Shells. 



CYPRJEID^B. 



Kiener's figure represents a mature specimen, probably not an 

 old one, with the columellar teeth not fully developed. We 

 are indebted to Mr. Redfield for the gift of his best specimen, 

 which appears to be full grown and perfect without the pus- 

 tulous surface. Col. Jewett also collected several specimens 

 of the same variety at Mazatlan. Perhaps the acquisition of 

 this character is the last change which the shell undergoes. 



14. Margiitella minor. Nov.sp. 



Shell ovato : white, or pale horn color, sabtransparent ; 

 rather thin, smooth : spire slightly elevated : whorls about 

 three (?) with a very indistinct suture : aperture linear : lip 

 rather thin at the margin, thickened behind, posteriorly as- 

 scending the spire : columella with two well developed plaits 

 at the end, with a third one less developed, and sometimes 

 with a fourth Avhich is more or less indistinct. Length, .09 

 inch : breadth, .063 inch : some of our specimens, which ap- 

 pear to be full grown, are much smaller. 



This little shell closely resembles the Caribbean species, 

 M. Lavalleana Orb. (M. minima Guild,): the most obvious 

 difference is in the outline, which in the Caribbean species is 

 broader across the upper part of the last whorl, the lip conse- 

 quently being, at this part, more excurved. 



Station. Unknown. 



Habitat. Panama ; C. B. A ! 



We obtained 10 more or less perfect specimens from the 

 calcareous sand, which had been washed up near the sea wall 

 of Panama. 



15. ITIargiiiclla sapotilla. 



Synonymy. 



Marginclla sapotilla Hinds in Proc. Zool. Soc. Loud. p. 74. April, 1844. 



- Hinds inVoy. Sulph. Moll. pi. 13. f. 10, 11. 1844. 



Thes. Conch, p. 383. No 39. pi. 77. f. 150-1. 1846. 



