18 "ALBATROSS" EASTERN TROI'ICAL PACIFIC EXPEDITION. 



From 800 fathoms at Station 4728 many of the Copepods, Diatoms, and 

 RadioLarians brought up in the net were dead. 



From 800 fathoms at Station 4732, the net sent down on the serial line 

 contained a great deal of dead and moribund stuff. 



At 300 fathoms at Station 4736 a great many dead Diatoms, Copepods, 

 Radiolarians, Globigerinoe, and Dinoflagellates were found. 



The poor hauls made after leaving Easter Island, and composed of dead 

 and moribund and battered stuff, occur beyond the limits of the Humboldt 

 stream, where the pelagic fauna gets no food ; it is dying and dropping to 

 the bottom. 



At Station 4710, in a surface haul, much debris of Diatoms, Dinoflagellates, 

 Tintinnids, and Radiolarians was obtained. 



At Station 4721, though still in the current, the Diatoms in the fine nets 

 had greatly diminished in number. 



The next Station, 4722, is still poorer in Diatoms, and at Station 4725 

 about half-wa}' to Manga Reva very few Diatoms were collected. 



In the Eastern Tropical Pacific area, GlobigerinaB increase in number in 

 the warmer water. This is very marked on the way from the Galapagos 

 to Manga Reva. 



At Station 4679, we met in the warmer waters representative tropical 

 forms of Dinoflagellates, forms not seen since leaving the Galapagos: Gonio- 

 doma, Gonyaulax, Piialacroma, Histoneis, Ornithocercus, Ceratocorys, Dino- 

 physis; among Radiolarians: TrypanospliEera, Conchidium, Cornutella, Choeni- 

 cosphgera. The abyssal fauna, as we entered the Humboldt current going 

 north from the Galapagos, gradually became • richer in spite of the bottom 

 being covered with manganese nodules. 



The distribution of the pelagic and bottom fauna can be seen at a 

 glance on Plate 3''. The curves drawn show in a general way the area over 

 which the, pelagic fauna is rich, poor, or barren. The northern limit of 

 the rich pelagic fauna (1) runs somewhat north of the equator from Long. 

 120' W. and nearly parallel with it as far as the northern Galapagos Islands ; 

 thence it runs in a northeasterly direction to a point south of Mariato 

 Point. 



The southern limit of the rich pelagic fauna (1) coincides with that of 

 the rich trawl hauls. It runs east to Long. 105^ W., makes a bend to the 

 .south, cro!5sing the 100° W. Long, at about Lat. 15° S., and then trends in 

 a southeasterly direction, crossing Lat. 20° S. at Long. 90° W. The southern 



