388 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
rather exceptional circumstances, the deposit itself being a Globigerina Ooze 
forming at a very moderate depth (1142 fathoms). In Station 297 of the 
“Challenger,” where there is also a Globigerina Ooze, the manganese nod- 
ules present are perfect nodules, and there is, moreover, a great abundance 
of palagonitic tuff, not met with in the case of this formation. 
PHOSPHATIC CONCRETION. 
At Station 4642 (lat. 1° 30.5’ S.; long. 89° 35’ W.; depth, 300 fathoms ; 
7th November, 1904), the trawl brought up an irregularly-shaped phosphatic 
concretion, four inches long, reddish-brown, very hard, and of high specific 
gravity. A fresh fracture shows it to be composed of numerous shells of 
Foraminifera, cemented by a reddish-brown matrix of amorphous phosphate 
of lime. The carbonate of calcium amounts to 36.36 per cent, the remain- 
ing portion being composed of phosphate of lime, with a little iron oxide 
(2 or 3 per cent at most), and insoluble residue. The latter is formed of 
mineral particles represented principally by plagioclase and augite. No 
glauconite is present. The surface is slaggy-looking, vacuolar, and rough to 
the touch; the only places where it has a shining appearance are inside the 
larger vacuole. The nature of the surface is the same everywhere, and 
organisms are growing on it in different places, so that the nodule could 
not have been embedded to any great extent in the deposit. 
Suarxks’ TEETH AND CETACEAN BONES. 
The remains of whales and sharks brought up from the floor of the 
Pacific during this cruise of the “Albatross” were submitted to Dr. C. R. 
Eastman, who had previously reported’ on the similar remains procured by 
Dr. Alexander Agassiz on his earlier cruise in 1899-1900, and the following 
notes on the teeth and tympanic bones dredged at the various stations are 
taken from Dr. Eastman’s report :?— 
“Station 4656, depth 2222 fathoms. There were brought up by the 
dredge from the bottom at this station 10 sharks’ teeth, amongst which 4 
are recognizable as belonging to the genus Lamna, 1 to Oxyrhina, | to Car- 
charodon, this last being a fine specimen, and the rest merely fragments. 
The cetacean material consisted of 1 tympanic bulla of Hyperoodon, | peri- 
1 Mem. Mus. Comp. Zoil., Vol. XXVI., p. 179, 1903. 
2 Bull. Mus. Comp. Zodl., Vol. L., pp. 80-82, 1906. 
