223 Zoological Socletij. 



expanso ; columelld bipUcatd, sed piled tertid inferiore obso letd; 



plied snperiore in dente acuto desinente, sinu inferiore magno ; um- 



bilico parvo. Axis 16 lin. 



Hah. The west coast of America, between 12° 2' and 21° 32' north 



latitude ; viz. Gidf of Papagaj'^o, in from eight to fourteen fathoms ; 



San Bias, in seven fathoms. 



The elevations which cross this shell are remarkably disposed. If 

 the finger-nail is driven over the shell, from the base towards the 

 apex, it meets with no resistance, but if in the contrary direction it 

 is obstructed at every elevation. The squareness of the last whorl 

 and the straight outer lip have a mutual relation, since they are de- 

 pendent on each other ; and these characters, taken collectively, will 

 be of value in making a diagnosis between nearly allied species. 

 Cancellaria albida. Cane, testd oblongd, subattenuatd, eanccl- 

 latd, alhescente ; aiifractibus septenis, inierstitiis transversis vel 

 subquadratis ; aperturd oblongd; labro aeuto, intiis suleato ; eolii- 

 melld biplieatd, plied tertid inferiore obsoletd ; vmbilico minimo, 

 suboecnlto ; eanali iuediocri, contorto. Axis 13 lin. 

 Hab. The west coast of America, between 2° 47' south, and 9° 55' 

 north latitude ; viz. Bay of Guayaquil, Panama, and Veragua, in from 

 seven to twenty-three fathoms. 



Cancellaria cremata. Cane, testd oblongd, subattenuatd, fused, 

 lueidd ; anfractibus quinis, eaneellatis, ifiterstitiis magnis, trans- 

 versis vel subquadratis ; aperturd oblongd, superne plied unicd ; 

 labro intiis suleis subdistantibus, labio interno expanso ; columelld 

 tripUeatd ; umbilico mediocri ; eanali breviusculo. Axis 10 lin. 

 Hab. Bay of Panama ; from a muddy bed in from four to ton fa- 

 thoms. 



The figures in the ' Conchological Illustrations,' Cancellaria 9 and 

 10, appear to me to represent two distinct species, both of which were 

 collected in the Sulphur. Fig. 10 corresponds more closely with the 

 description of C. indentata, and'to this I would limit the species. The 

 opinion which I had formed from the specimens in my own posses- 

 sion, became fully confirmed in the examination of those in Mr. Cu- 

 ming's collection, and a fine shell belonging to him enables me to 

 enrich the description. It may be desirable to remark that M. Kie- 

 ner has copied both figures, and assigns them to one species. 



Cancellaria corrugata. Cane, testd bucciniformi, fused ; an- 

 fractibus quaternis, subventricosis, rugis parvis longitudinalibus 

 confertis indutis, Uneis impressis decussatis ; aperturd oblongd, 

 fused; labro intiis suleato; columelld plicis duabus albidis instrucld; 

 umbilico nullo ; eanali mediocri. Axis 8 lin. 

 Hab. Bay of Guayaquil. From seven fathoms; mud. 

 Cancellaria elata. Ca7ic. testd ovatd, elongatd, acuminatd ; an- 

 fractibus septenis costatis, superne angulatis, Uneis elevatis decus- 

 satis ; suturdprofundd; aperturd ovali ; peritremate superne dis- 

 juncto ; labro intiis suleato ; columelld triplicatd, plica inferiore 

 maximd ; umbilico parvo, subocculto ; eanali inflexo. Axis 9 lin. 

 Hab. A single specimen was obtained at Panama, from thirty fa- 

 thoms. 



