NOTES ON ANTARCTIC ROCKS. 465 
In 1874, H.M.S. Challenger visited the neighbourhood of the 
supposed Termination Land of Wilkes, and drift fragments were 
brought up by the dredge of granite, dioritic rocks, quartzites, 
clay shales etc. Tetrasporew were so abundant over wide areas 
as to give the sea a peculiar green colour, and the sea swarmed 
with diatoms. In 1883! the Zalisman dredged from depths 
mostly of between 4,000 to 5,000 métres, common granite, horn- 
blendie granite, pegmatite, granulites rich in muscovite and 
microcline, with two specimens respectively of diorite and diabase, 
and numerous specimens of gneiss and hornblendic gneiss. The 
gneisses were found to be more abundantly represented than the 
volcanic rocks. The following minerals are recorded as having 
been observed in the gneiss :—microcline, zircon, sphene, apatite, 
rutile, garnet, tourmaline, biotite, muscovite, magnetite, epidote, 
amphibole, pyroxene, diallage, and enstatite. 
Amongst rocks probably of volcanic origin may be mentioned 
seven specimens of augitic labradorite rocks, two of basalt, and 
eight of andesites partly hornblendic, besides five specimens of 
pumice, eight of basic scorie more or less palagonitic, and ten 
Specimens of very basic tuffs. Amongst metamorphic rocks 
dredged by the Talisman, may also be mentioned five specimens 
of mica schists with tourmaline, microcline, sphene and epidote, 
fifteen specimens of sericite and very epidotic quartz schists rich 
in rutile, besides argillaceous schist with erystals of biotite and 
garnet and numerous particles of graphite. 
Amongst other rock specimens dredged were many representing 
undoubted sedimentary rocks, ¢.g., sixteen of arkose very quartzose, 
nineteen of sandstones, and sixty-three of limestone. Some of 
the limestones are marble, some are oolitic, and thirty-one are 
fossiliferous, the fossils consisting chiefly of indeterminable bivalve 
shells. Some fragments of hard yellowish magnesian limestones 
contain sections of Gyroporella, and are therefore very probably 
J *Fouqué and Lévy—Comptes Rendus de I’Académie des Sciences, 
anvier — Juin, 1886, cir., pp. 793 — 795. 
Dp—Dee. 4, 1895, 
