NASSA. Panama Shells. 59 



IV ASS A. Mr. Powis has described in the Proceedings 

 of the Zoological Society of London, 1835, pp. 95, 96, seven 

 species of this genus from Panama and from other parts of 

 the same Zoological province. "We obtained fourteen species, 

 two (perhaps three) of which answer to the descriptions by 

 Mr. Powis. 



43. Nfassa canescens. Nov. sp. 



Shell rather long, ovate conic : pale brown on all the 

 raised portions of the surface, with the interspaces pale gray : 

 with ten or eleven very prominent narrow ribs, and many 

 raised spiral lines, which are not interrupted by the ribs, and 

 of which two on the middle of the whorls and some anteriorly 

 are larger : spire with the outlines nearly rectilinear : apex 

 acute : whorls eight or nine, subangular in the middle, with a 

 well impressed suture ; last whorl moderately ventricose, an- 

 teriorly spirally subcanaliculate : aperture subelliptical : labrum 

 subacute, much thickened by a varix a little behind the edge, 

 finely grooved within : labium finely wrinkled, a little dilated 

 but not appressed : notch large and deep. 



Mean divergence about 50 ; length 1.05 inch ; breadth .6 

 inch ; length of spire .6 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A ! 

 1 specimen was obtained. 



44. Nassa collaria. Nov. sp. 



Synonymy, 

 liassa collaria, Gould MSS. 



Shell ovate conic : dingy white, with a dark reddish 

 brown band on each side of the whorl : with, on each whorl, 

 about ten or twelve ribs, which are smaller and more approxi- 



