64 Panama Shells. pukpuridjk. 



Habitat. — Atlantio Ocean, on the shores of Africa ; Kiener. 

 " Bay of Montija, West Columbia ;" Cuming ! 



Reeve. 

 Payta ; Petit in sched. 

 Taboga and Panama ; C. B. A. ! 

 22 specimens were collected. 



51. Nassa Panaiuensis. — Nov. sp. 



Shell long ovate conic : bluish olivaceous, with a whitish 

 spiral line below the middle of the whorls ; colors more dis* 

 tinot on the ribs ; whitish near the upper part of the labrum ; 

 anteriorly with a pale spiral band, which is sometimes obso- 

 lete : with, on each whorl, about eleven narrow acute ribs, 

 which are obsolete anteriorly ; with very minute spiral striae, 

 which are less distinct below the middle of the whorls : spire 

 with the outlines moderately curvilinear : apex acute : whorls 

 eight, slightly convex, with a distinct suture ; last whorl not 

 ventrioose : aperture elliptical ; labrum thickened by a stout 

 varix : labium thickened but riot appressed : notch deep. 



Mean divergence about 37°; length .58 inch; breadth .25 

 inch ; length of spire .35 inch 



Station. — Under stones, a little above low water mark, in 

 company with several species of Columbeila. 



Habitat. — Panama ; C. B. A. ! 



"We collected about 1500 specimens on the reef. 



52. IVassa proxiina — Nov. sp. 



L Shell like that of N. versicolor (v. infra), but much more 

 slender, with the ribs less prominent, and very densely covered 

 with very minute uninterrupted striSe, which give a silky 

 lustre to the surface. 



Mean divergence about 38°; length .44 inch; breadth .21 

 inch.; length of spire .28 inch. 



