140 Panama Shells, MURICID^E. 



Pleurotoma collaris Mull. Synop. Nov. Test. Viv. p. 117. May 1836v 

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



Station. Muddy sand at the depth of 8 fathoms ; Cuming E 

 Sowerby : also Reeve. 



Habitat' Bay of Caraccas ; Cuming ! Sowerby :. also Reeve. 



West Columbia ; Jay. 



Panama ; C. B. A, ! 

 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 Kiener, 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 corrugata. 



Synonymy. 



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



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

 tttrricula Sowb. (non Macgillivray) in Proc. 



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



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