of Microscopical Organisms. ^349 



sixteen rays, as above, which, however, are of (lid'cn'iit 

 colors, giving the frustule the appearance of a four-colored 

 star. This species may be distinguished from C. antirjua 

 by its large granules on the rim. It may be C. ? radiala 

 of Brightwell, of which I have seen no figure. 



Before dismissing the interesting forms obtained in the 

 cruise of the Dolphin, it may be well for the sake of com- 

 parison with results obtained elsewhere, and which will be 

 noticed in a subsequent paper, to give a list of the sound- 

 ings not already described. These are four in number as 

 follows : — 



1. Lat. 1° 01' 29'' N. Depth 43 fathoms. April, 1852. 

 Long. 46° 17' 46" W. 



Contents. — Calcareous nullipores and corals. When 

 washed the following were obtained. 



Staiiroptera aspera. Grammatophora. 



Svnedra. Biddulphia pulchella. 



Fragillaria? in bands. Coscinodiscus subtilis. 

 Pinnularia interrupta. 



Many large Globig-erince, and soft parts of Polythnlamia. 



2. Lat. 2° 36' 52" N. Depth 58 fathoms. Long. 47° 

 45' 02" W. 



Nullipores and large Polythalamia, which, on washing, 

 yielded many sponge spicules, abundant Fragillaria, Navi- 

 cula formosa ?, P. interrupta, and one specimen of Si/rin- 



g-idium. 



3. Lat. 0° 20' 58" N. 27 fathoms. Long. 46° 18' 

 31" W. 



Fine quartzose sand, which yielded almost nothing by 

 drying and floating. The fine washings gave some sponge 

 spicules, some Polythalamia and Diatoms. 



Actinoptyclms senarius. Coscinodiscus lineatus. 



Amphora ovalis. Triceratium favus. 



Melosira sulcata. Biddulphia. 



Navicula Lyra. Plates of Synapta tenuis. 



Stauroptera aspera. Quinqueloculina. 



Synedra. 



