42 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 



age diameter of the more numerous fragments is 0.5 mm., but one piece 

 attains 1 cm. in diameter. The rock is an augite-andesite, colored dark 

 green by a high percentage of chloritic material. The fragments are 

 angular, not rounded. 



Fiiie Washings (24.80 per cent), brownish-green amorphous matter con- 

 taining only a very few minute mineral particles. 



No. 3. Station 4505, 5th November, 1904. 

 Lat. 3° 11.6' N.; long. 84° 57.4' W.; depth, 1705 fathoms. 



GLOBIGERINA OOZE : dark gray, slightly plastic, dries into lumps coher- 

 ent to a small extent only ; no macroscopic elements. 



Calcium carbonate : 38.35 per cent, shells, complete and broken, of 

 Foraminifera belonging mostly to the genera Globigerina and Pulvinulina, 

 Echinoid spines, coccoliths, and rhabdoliths. 

 Residue: 61.65 per cent: — 



Siliceous Organisms (0.5 per cent), a few Sponge spicules, Radiolaria, and 

 diatoms. 



Minerals (1.5 per cent), a few grains of pale augite and magnetite with 

 a mean diameter of 0.2 mm. These minerals are masked by an abundance 

 of small gray lumps, recalling in their general appearance comminuted 

 pumice. One fragment of volcanic glass was detected, which probably be- 

 longed to a piece of Pele's hair, as it is rod-like and semi-circular, with the 

 bore occupying the greater part of the diameter. 



Fine Washings (59.65 per cent), amorphous, flocculent matter, brown 

 when wet, gray when dry, in which exceedingly minute particles of augite 

 can be seen, but in small amount, together with broken Sponge spicules. 

 The following is a list^ of the species of Foraminifera observed in the 

 from this station : — 



Hajdophragmium emaciatum, Brady. 

 Vemeitilina pygmwa (Egger). 

 Gaudryina pupoides, d'Oib. 



" " var. chilostoma, Rss. 



Bulimina elegans, d'Orb., var. exilis, Brady. 

 Ehrenbergina serrata, Ess. 

 Lagena sulcata (W. & J.), var. irite^'ntpta, 



Will. 



SilocuUna depressa, d'Orb. 



" " var. murrhyna, Schw. 



" irregularis, d'Orb. 



Spiroloculina tenuis (Czjzek). 

 Miliolina tricarinata (d'Orb.). 



" trigonula (Laink.). 

 Haplophragmium nanum, Brady. 

 " anceps, Brady. 



1 The lists of species of Foraminifera in the deposits from Stations 4505, 4691, 4705, and 4717 

 have been drawn up by Mr. F. G. Pearcey, formerly an assistant in the Challenger Office, now of the 

 Bristol Museum. 



