42 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



viz. Gulf of Papagayo, 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 dependent on each other ; and these characters, taken collectively, 

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



172. Cancellaria albida, Hinds, 1. c. p. 47, (Plate XII, fig. 9, 10.) Testa oblonga, subat- 

 tenuata, cancellata, albescente ; anfractibus septenis, interstitiis transversis vel subquadratis ; aper- 

 ture oblonga ; labro acuto, intus sulcato; columella biplicata, plica tertia inferiore obsoleta; umbi- 

 lico minimo, subocculto ; canali mediocri, contorto. 



Inhab. 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. 



173. Cancellaeia cremata, Hinds, 1. c. p. 48. Testa, oblonga, subattenuata, fusca, lucida ; 

 anfractibus quinis, cancellatis, interstitiis magnis, transversis vel subquadratis ; apertura oblonga, 

 superne plica unica ; labro intus sulcis subdistantibus, labio interne expanso ; columella triplicate ; 

 umbilico mediocri ; canali breviusculo. 



Inhab. Bay of Panama ; from a muddy bed in from four to ten fathoms. 



The figures Cancellaria 9 and 10, in the " Conchological Illustrations," ap- 

 pear to me to represent two distinct species, both of which were collected in 

 H. M. S. Sulphur. Fig. 10 corresponds more closely with the description of C. 

 indentata, and to this I would limit the species. Fig. 9 will then represent the 

 above. 



174. Cancellaria corrugata, Hinds, X. c. p. 48, (Plate XII, fig. 1,2.) Testa bucciniformi, 

 fusca ; anfractibus quaternis, subventricosis, rugis parvis longitudinalibus confertis indutis, lineis 

 impressis decussatis ; apertura oblonga, fusca ; labro intus sulcato ; columella plicis duabus albidis 

 inslructa; umbilico nullo ; canali mediocri. 



Inhab. Bay of Guayaquil. From seven fathoms, mud. 



175. Cancellaria elata, Hinds, 1. c. p. 48, (Plate XII, fig. 3, 4.) Testa ovata, elongata, 

 acuminata ; anfractibus septenis costatis, superne angulatis, lineis elevatis decussatis ; sutura pro- 

 funda; apertura ovali; peritremate superne disjuncto; labro intus sulcato; columella triplicate ; 

 plica inferiore maxima; umbilico parvo, subocculto; canali infiexo. 



Inhab. A single specimen was obtained at Panama, from thirty fathoms. 



This shell will always be readily distinguished by its elongated form, 



