PLEUROTOMA. Panama Shells. 143 



Station. — Unknown. 

 Habitat. — Panama ; 0. B. A. I 



1 specimen of this elegant little shell was obtained in the 

 calcareous sand on the shore. 



1V3. Pleurotoma ^emmulosa. Nov. sp. 



Shell long, subfusiform : brown, with some pale spots : 

 surface densely covered with small transverse and spiral ridges, 

 with the intersections developed into elegantly rounded promi- 

 nent nodules, except near the end of the last whorl, where the 

 transverse ridges are obsolete : apex acute : spire with the out- 

 lines very curvilinear : whorls eight, a little convex, with a 

 moderately impressed suture: aperture very narrow, with a 

 email sinus near the suture : labrum thickened without and 

 within : canal very short. 



Mean divergence about 33° ; length .22 inch ; breadth .08 

 inch ; length of spire .14nnch. 



Station. — Unknown. 



Habitat. — Panama ; C. B. A. I 

 1 specimen was found, 



174. Plenrotoiiia grandimaculata. Nov. sp. 

 Shell long, ovate pyramidal : black, with a single spiral series 

 of very large dingy white spots : with excessively minute incre- 

 mental and spiral striae, the latter of which are obsolete ante- 

 riorly ; with a sharp simple spiral keel a little below the suture ; 

 a little below the middle of the whorls is a sharp tuberculated 

 keel which is less developed between the tubercles; these 

 tubercles coincide with the white spots, and on the last whorl 

 are transversely elongated ; on the last whorl four or five more 

 spiral linear keels are seen : apex acute : spire conic : whorls 

 ten, concave between the keels, with the suture indistinct; 

 aperture rather narrow ; labrum moderately thickened, with the 

 sinus rather deep : labium well developed : canal very short. 



