acAliAKiA. Panama Shells. 197 



Mr. Eeeve, in referring only to tlie MSS. of a private collec- 

 tion for the name of this species, appears to have overlooked the 

 name and the tolerably correct figure in Wood's Index. Three 

 extreme varieties are well represented by the figures in 'the 

 Conch. Icon. Most of our specimens are intermediate between 

 fig. a and fig. b, having a second row of tubercles moderately 

 developed above the middle of the last whorl, with a fcorres- 

 ponding keel on the spire. 



The operculum is very thick and deeply sculptured, A deep 

 indentation corresponds to the apex, and deep narrow furrows 

 occupy arcs of about 300° ; of these furrows, the larger is mid- 

 way between the apex and the margin, and three others are 

 exterior to it. The surface is granular, and the sides of the fur- 

 rows are rugose. 



Station.-,-On rocks, not far from the low water mark of the 

 neap tides. 



Habitat. — Unknown ; Wood. 



West Columbia ; Cuming ! Eeeve. 



Panama ; C. B. A. I 

 We collected 160 specimens on the reef at Panama. Half 

 grown shells were numerous. 



285. Scalaria hexag^oiia. 



Synonymy. 



Scalaria heaagma Sowb. in Proc. Zool. Soc. Lond. p. 29. Feb. 1844. 



Sowb. Thes. Conch, p. 98, No. 60. pi. 



33. f. 67. - - - - 1844. 



Station. — In the sands ; Sowerby. 



Habitat. — Acapulco; Col. MofiatI Sowerby. 



Acapulco; Jay. 



Panama ; 0. B. A. J 

 1 specimen was found. 



JULY, 1852. 50 Aim. Lto. Nat. Hist. 



