144 Panama Shells. mubicid^. 



Mean divergence about 38° ; length .95 inch ; breadth .35 

 inch ; length of spire .62 inch. 



Having received from Mr. Ouming specimens of this species 

 labelled P. zonulata, we infer that it has been confounded with 

 that species in collections. Mr. Cuming's specimens are said, 

 in the MS. catalogue to have come from the Philippine Is., 

 but as their specific identity with our species is unquestionable, 

 it is probable that the catalogue is erroneous. 



Station. — [Jnknown. 



Habitat. — Panama ; C. B. A. ! 



We obtained 1 fresh and 1 faded specimen. 



175. Pleurotoma iikcrassata. 



Synonymy. 



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



" p. 138. - - - . Dec. 1833, 



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



Bottce Kiener Iconog. p. 33. pi. 15. f. 2. 



incrassata Reeve Conch. Icon. pi. 9. f. Y6. Apr. 1843. 



Station.— Sandy mud at the depth of 6 to 10 fathoms ; Cum- 

 ing I Sowerby : also Eeeve. 



Habitat. — Panama, and Monte Christi ; Cuming I Sowerby. 



Mazatlan ; Botta 1 (?) Keener. 



Bay of Panama, &c. ; Cuming I Eeeve. 



Mazatlan; MelchersI Menke. 



Panama ; C. B. A. I 

 1 specimen was obtained. 



176. Pleurotoma nigrerrima. 



Synonymy. 



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



P- 187. Dec. 1883. 



