142 Panama Shell's,. 



Habitat. Puerto 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 blacMsh brown eolor, 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 excentrica I 



Synonymy.. 



Pleurotoma excentrica Sowb. in Proc. Zool. Soa. Lond. 



p. 138. Dee. 183S. 



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



. Reeve Coacli. Icon. pi. 7. f. 58. Mar. 1843.. 



Station. Coral sand at the depth of 6 fathoms ;: Cuming !. 

 Sowerby : also Eeeve. 



Habitat, Gallapago Is. ; Cuming! Sowerby:. also Eeeve. 

 Panama ; C. B. A. I 



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 cuoss the ribs only 

 anteriorly. 



172. Pleurotoma cxigtia. Nov. sp. 



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

 lines, of which the two or three 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 half of the 

 last whorl :. apex acute :. spire with the outlines moderately- 

 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 about 34 ; length .175 inch ; breadth .Q6< 

 inch ; length of spire .1 inch, 



