in the Ocean at the South Pole. 
121 
and with Coscinodiscus, which on softening in water generally 
exhibited their green ovaries, perhaps originally brown. 
5. Contents of the stomach of a Salpa, 66° S. lat., 157° W. long. 
1842. 
SILICEOUS POLYGASTRICA. 
1. 
Actiniscus Lancearius. 
8. 
Dictyocha aculeata. 
2. 
Coscmodiscus Apollinis. 
9. 
-- Speculum. 
3. 
— singulatus. 
10. 
Fragilaria acuta. 
4. 
— gemmifer. 
11. 
— granulata. 
5. 
— lineatus. 
12. 
— rotundata. 
C. 
— Lunce. 
13. 
Halionyx duodenarias. 
7. 
— subtilis. 
14. Pyxidicula. 
This material contained a large number of Dictyochus, 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 C/uetoceros, The 
nature 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. 
Astero7nphalus Darwinii. 
10. 
Dictyocha aculeata. 
2. 
— 
Hookerii. 
11. 
— fiinoculus. 
3. 
— 
Bossii. 
12. 
— Ornamentum, 
4. 
— 
Buchii. 
13. 
— Speculum. 
5. 
— 
Humboldtii, 
14. 
Fragilaria Amphiceros. 
6. 
Cii.-utoceiios Dichceta. 
15. 
— granulata. 
7* 
— 
Tetrachceta. 
16. 
PIemiaulus obtusus. 
8. 
Coscinodiscus lineatus. 
17. 
Lithobotrys dcnticulata. 
9. 
— 
subtilis. 
