142 Panama Sheik. mueicid^. 



Habitat— Pusiio Portrero and Bay of Montija in Central 

 America ; Cuming ! Sowerby : also Eeeve. 

 Panama ; C. B. A. I 



1 specimen was obtained : it is of a blackish brown color, but 

 otherwise is indistinguishable from a specimen received from 

 Mr. Cuming. It is smaller and more slender and finely sculp- 

 tured than Mr. Eeeve's figure. 



171. Pleurotoma excentrical 



Synonymy. 



Pleurotoma excenlrica Sowb. in Proc. Zool. Soc. Lond. 



p. 138. - - Dec. 1833. 



Mull. Synop. Nov. Test. Viv. p. 115. May 1836. 



Reeve Conch. Icon. pi. T. f. 58. Mar. 1843. 



Station. — Coral sand at the depth of "'6 fathoms; Cuming! 

 Sowerby : also Eeeve. 



Habitat. — Gallapago Is. ; Cuming I Sowerby : also Eeeve. 

 Panama ; 0. B. A. ! 



We found 1 specimen, which probably belongs to this species. 

 It is a little longer than the figure in the Conch. Icon., and is 

 distorted only in the last whorl : spiral lines cross the ribs only 

 anteriorly. 



172. Pleurotoma exi^tia. Nov. sp. 



Shell slender : pale cream color, with very fine brown spiral 

 l^ne^f of j^hiph.the. twppr |hree upper ones are single, and the 

 rest are in pairs : with distant obtuse transverse ridges, about 

 six or seven on each whorl, obsolete on the anterior' h^ilf of the 

 last whorl : apex acute : spire with the outlines moder£^tely 

 convex : whorls six, convex, with a distinct suture : aperture, 

 narrow : labrum thickened by the last ridge a little behind the 

 edge, with a deep sinus near the suture : canal very short. 



Mean divergence abqut 34° ; length .175 inch ; breadth .06 

 inch J length of spire .1 inch. 



