140 Panama Shells. MUElCiDiE. 



Pleuroloma collaris MUll. Synop. Nov. Test. Viv. p. 117. May 1836, 



Reeve Conch. Icon. pi. 15. f. 120, July 1843. 



Station.— Unddj sand at the depth of 8 fathoms ; Cuming I 

 Sowerby : also Keeve. 



Habitat.— Bay of Caraccas ; Cuming I Sowerby : also Keeve. 



West Columbia ; Jay. 



Panama ; 0. B. A. I 

 4 specimens were collected. 



167. Pleurotoma concinna. Nov. sp. 



Shell fusiform : white, tinged more or less with reddish 

 brown : with numerous crowded small ribs, which become ob- 

 solete near the labrum, and crowded spiral striae, which are finer 

 on the spire : apex acute : spire with moderately convex out- 

 lines: whorls eight, angular along the middle, with a mode- 

 rately impressed suture : aperture very long and narrow : la- 

 brum very much thickened a little behind the edge, with the 

 sinus deep and very near the suture : canal scarcely distinct 

 from the aperture. It resembles P. triticea Eaener, and may be 

 a Mangelia. 



Mean divergence about 43° ; length .42 inch ; breadth .17 

 inch ; length of spire .18 inch. 



Station. — Unknown. 



Habitat. — Panama ; C. B. A. ! — 1 specimen was obtained. 



168. Pleurotoma comigata. 



Synonymy. 



Pleurotoma corrugata Sowb. (non Kiener) in Proc. Zool. 



Soc. Lend. p. 137. - - Dec. 1838. 



turricula Sowb. (non Macgillivray) in Proc. 



Zool. Soc. Lond. p. 137. - - Dec. 1833. 



Umil ZrrHula \ ^""- ^^""P- ^°^- Test- Viv. p. 114. May 1836. 



