the Ocean at the South Pole. 



175 



5. Contents of the stomach of a Salpa, 66° S. lat., 157° W. long. 



18^2. 

 SILICEOUS POLYGASTRICA. 



Dictyocha aculeata. 



— Speculum. 

 Fragilaria acuta. 



— graniilaia. 



— rotundata. 

 Halionyx duodenarias. 

 Pyxidicula. 



This material contained a large number of Dictyochas, which 

 endently must have been particularly sought for by the Salpa, 

 since they do not occur in the other samples, and consequently 

 appear to be a favourite food of the Salpa. 



6. Flakes floating on the surface of the ocean in 64° S. lat., 



160° W. long. 

 Tliey are like the Oscillatoria of our waters, matted with deli- 

 cate fibres and with granules interspersed through the mass. 

 The chief substance is formed of siliceous, very delicate, lateral 

 tubes of the quite new and peculiar genus Cha'toceros. The na- 

 tm-e of the granules remains doubtful. The other forms are 

 scattered through this matted substance ; all exhibit however theii* 

 di-ied-up ovaries, and consequently were collected alive, 



SILICEOUS POLYGASTRICA. 



1. AsTEROiiPHALUs Dorwinij. 



10. Dictyocha aculeata. 



7. The mass brought up by the lead from the bottom of the sea 

 in the Gulf of Erebus and Terror, at the depth of 207 fathoms, 

 in 63° 40' S. lat., 55° W. long. 



The following species, occasionally with distinct green ovaries, 

 were found in this very small sample, mixed among the apparently 

 unorganic sand, 



A. SILICEOUS POLYGASTRICA. 



