618 



COMMANDER KNOCKER ON PELAGIC SHELLS. [Nov. 26, 



Table 



' Much crystalline sand, full of microscopic shells. 



Every da_v, when the weather and the speed of the ship allowed it, 

 I took specunens of each sort 1 procured and gummed them on 

 cardboard, marking date, latitude, and longitude ; thus the Table 

 must be correct. 



Respecting the spiral shells {Cheletropis, Sic), of which I found 

 many varieties, I only casually notice them, being unable to name 

 them. 



I have followed Mons. Rang's nomenclature chiefly, but in a few 

 cases have put "var." (variety) against some of the columns, as the 

 species differ somewhat from those figured in his work. 



