BucciNUM. Panama SheMs. 67 



Habitat.— T&hoga. ; C. B. A. ! 



More than 500 specimens \Ter6 collected, all occupied by 

 hermit crabs. 



66 Nassa TVilsoni.— Nov. sp. 



Shell ovate conic, ventricose : blackish brown, with a dingy 

 white spiral band, at or a little above the suture : with six- 

 teen to twenty small ribs, some of the last of which are obso- 

 lete on the convexity of the whorl, and of which one next be- 

 hind the varix is larger ; with many spiral raised lines, which 

 are smaller on the summits of the ribs, and which are nearly 

 obsolete in the region where the ribs are obsolete : spire with 

 the outlines curvilinear : apex acute : whorls seven, slightly 

 convex, with a distinct suture : last whorl ventricose, ante- 

 riorly with a small spiral canal : aperture suborbicular : labrum 

 subacute, much thickened within and without, with a few 

 sharp ridges within : labium thickened, not appressed : notch 

 deep. 



Mean divergence about 58° j length .32 inch ; breadth .19 

 inch ; length of spire .18 inch. 



This pretty little species is named in honor of Dr. Thomas 

 B. Wilson, of Philadelphia, the munifioent patron and success- 

 ful cultivator of Natural History. 



Station. — ^Unknown. 

 Habitat. — ^Panama ; C. B. A. ! 

 5 specimens were obtained. 



51. Bnccinum crassuin. 



Synonymy. 



Phos crassus Hinds Voy. Sulph. Moll. p. 38. pi. 10. f. 1, 2. 1844. 



A. Ad. Ann. and Mag. Nat. Hist. VIII. No. 43. 



p. 71. July 1851. 



