•210 
THE VOYAGE OF H.M.S. CHALLENGER. 
*Xanci(Ia subtilis, Greg. 
ThalassiotJu'ix longissima, var. antarctica, 
Cl. et Gruu. 
*Sy?iedm lanceolata, Cstr. 
„ nitzschioides, Grun. 
,, Jiliformis, Grim. 
Thalassionema nitzschiodes, var. lanceo- 
lata, Grun. 
*Tmchysp1ienia australis, Petit, var. 
antarctica, Schwarz. 
*Diatoma rhomhicum, 0’Me.,var. oceanica, 
nov. 
Nitzschia constncta, var. antarctica, nov. 
^Rhizosolenia styliformis, Brightw. 
,, furcata, n.sp. 
*Corethron criophilum, Cstr. 
Ilemiaulus antarcticus, Ehrenb. = Eucam- 
p>ia halaustium, Cstr. , and var. minor. 
Asteromphalus hooherii (Ehrenb.), Ealfs. 
,, forma buchii, Ehrenb. 
,, forma humboldtii, Ehrenb. 
,, forma cuvierii, Ehrenb. 
,, forma denarius, Janisch. 
,, darwinii, Ehrenb. 
Ilyalodiscus radiatus, O’Me., var. arctica, 
Grun. 
* Actinocyclus oliveranus, O’Me. 
Coscinodiscus margaritaceus, Cstr. 
* ,, lunse, Ehrenb. 
,, excentricus, Ehrenb. 
* Indicateo the peculiarly Antarctic species. 
Coscinodiscus atlanticus, Cstr., and var. 
„ lineatus, Ehrenb. 
,, lentiginosus, Janisch. 
,, ,, var. maculata, 
Grun. 
Coscinodiscus africanus, var. wallichianas, 
Grun. 
Coscinodiscus subtilis, Ehrenb. 
t ,, ,, var. glacialis, Grun. 
,, tumidus, Janisch. 
,, ,, var. fasciculata, 
nov. 
Coscinodiscus radiatus, Ehrenb. 
t , , decrescens, var. polaris, Grun . 
+ Coscinodiscus decrescens,\Qx. repleta,Qr\m. 
„ fasciculatus, A.S. 
,, griseus, var. gallopagensis, 
Grun. (?) 
Coscinodiscus curvulatus, maculata, nov. 
„ tuber culatus, Grev., var. 
excentrica, nov. 
Coscinodiscus tuberculatus, var. antarctica, 
nov. 
Coscinodiscus elegans, Grev. 
,, robustus, Grev. 
„ ,, var. minor. 
„ antarcticus, Cstr. (nov. 
Grun.). 
Coscinodiscus denarius, A.S. 
,, marginatus, Ehrenb. 
t Species also recorded from the Arctic zone. 
A.S all the Diatom de^josits, so far Jis we know, are confined to the Southern or 
.Antarctic Oceans, or to the northern parts of the North Pacific, none of the species of 
Fo/aminifera, Kadiolaria, or Diatoms characteristic of the tropical regions arc found in 
them ; Coccoliths and Rhabdoliths arc absent, except in a few of the more northerly 
samples in the southern hcrni.sphere. 
The carbonate of lime varies from 2'00 per cent, in 1975 fathoms to 30 ‘34 per cent, 
in GOO fathoms, the average being 22'9G per cent. By far the larger part of this 
