in the Ocean at the South Pole. 175 



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



1842. 



SILICEOUS POLYGASTRICA. 



1. Actiniscus Lancearius. 8. Dictyocha aculeata. 



2. Coscinodiscus Apollinis. 9. — Speculum. 



3. — cingulatus. 10. Fragilaria acuta. 



4. — gemmifer. 11. — granulata. 



5. — lineatus. 12. — rotundata. 



6. — Luna. 13. Halionyx duodenarias. 



7. — subtilis. 14. Pyxidicula. 



This material contained a large number of Dictyochas, which 

 evidently 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. 



They are like the Oscillatorice 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 Chatoceros. The na- 

 ture of the granules remains doubtful. The other forms are 

 scattered through this matted substance ; all exhibit however their 

 dried-up ovaries, and consequently were collected alive. 



SILICEOUS POLYGASTRICA. 



1. Asteromphalus Darwinii. 10. Dictyocha aculeata. 



2. — HooJcerii. 11. — Binoculus. 



3. — Rossii. 12. — Ornamentum. 



4. — Buchii. 13. — Speculum. 



5. — Humholdtii. 14. Fragilaria Amphiceros. 



6. Ch^etoceros Dichceta. 15. — granulata. 



7. — Tetrachceta. 16. Hemiaulus obtusus. 



8. Coscinodiscus lineatus. 1/. Lithobotrys denticulata. 



9. — subtilis. 



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 7 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. 



1. Anaulus 8calaris. 5. Coscinodiscus Luna. 



2. Biddulphia ursina. 6. — stfbtilis. 



3. Coscinodiscus Apollinis. 7. — velatus. 



4. — cingulatus. 8. Fragilaria rotundata. 



