PLEUROTOMA. Panama Shells. 139 



granules next above the suture, and a not very prominent keel 

 above the middle of the whorls ; on the last whorl three other 

 keels appear, which are more or less granulated: apex very 

 acute : spire with convex outlines : whorls eleven, angular un- 

 der the spiral keel, beneath it concave, with an indistinct suture : 

 aperture long, with a rather deep sinus : canal very short, wide. 

 This species has some resemblance to P. discors. It must also 

 resemble P. Meklmsi Menke, Zeitschr. 1851. p. 20. 



Mean divergence about 38° ; length .8 inch ; breadth .28 

 inch ; length of spire .5 inch. 



Station. — Unknown. 



Habitat. — Panama ; 0. B. A. ! 

 Only 1 specimen was obtained. 



165. Pleurotoina Mcanalifera. 



Synonymy. 



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



p. 136. - - - Deo. 1833. 



.. . Miill. Synop. Nov. Test. Viv. p. 



112. - - - May 1836. 

 Reeve Conch. Icon. pi. 12. f. 103. May 1843. 



Station. — Sandy mud at a depth of 10 fathoms ; Cuming ! 

 Sowerby : also Eeeve. 



Sabitat. — Shores of Central America ; Cuming I Sowerby : 

 also Miiller. 



Bay of Montija ; Cuming ! Eeeve. 



Taboga ; C. B. A. ! 

 We found only 1 specimen. 



166. Plenrotoma collaris. 



Synonymy. 



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



p. 139. Deo. 1833. 



