PELAGIC AND INTERMEDIATE DEPTHS FAUNA. 15 



Euphausi* with other Sehizopods and Hyperids and Araphipods consti- 

 tuted the mass of pelagic animals at Stations 4654 and 4676. 



Acalephs, mainly Liriope and Glossocodon, filled the nets at Station 4671. 

 At Station 4743 Crystallodes swarmed with a few other Acalephs and 

 Siphonophores. 



At Stations 4712, 4715 a surface haul contained mainly transparent 

 types : Sagitta, Doliolum, Pteropods. 



Halobates were quite common at the stations where the swarms of 

 pelagic animals occurred. A large Tornaria with rows of feathery vibratile 

 cilia was also not uncommon on such occasions. 



When coming across such masses of Salpse, of Cytteis, or Cymbulia or 

 swarms of other pelagic animals as to make a thick soup of the water and 

 its contents, one cannot fail to be struck with the huge quantity of minute 

 pelagic organisms which must be devoured by these larger pelagic animals. 

 An excellent example of this is the instance given of the contents of the 

 guts of Salpce, at Stations 4650, 4660, and 4709. They contained among 

 other Diatoms : Planktoniella, Rhizosolenia, Coscinodiscus, Asteromphalus, 

 and Synedra, many Dinoflagellates such as Ceratium, Peridinium, Steiuiella, 

 and a great number of Radiolarians : 



Acanthonia CoUosphajra - Coelodeudrum 



Acanthochiasma EUipsostylus Dorotaspidai 



Acanthometron Hexalouche Acantliaria 



Zygacantha Diploconus Lithocampe 



Acanthostaurus Haliomnia Aulosplucra 



Qiiadiilonche Coionidium 



Astioloplius Rliopalastrum 



Between Panama and the Galapagos and from the Galapagos to Callao 



we found very commonly in our tow-nets, from 300 fathoms, Tuscarora, 



Tuscarusa, Aulosphoera,and others. In depths of 300 fatlioms to the .surface, 



the tow-net was rich in Tintinnidnj, either dead or moribund Planktoniella?, 



and Dinoflagellata. Among these were species of Ceratium. of Peiidinida?, 



Gonyaulax, Phalacroma, Pyrocystis, Cyttarocylis, Undella, and Dictyocysta. 



On the surface Planktoniella sol predominates, with Asteromphalus, Biddul- 



phia, and Thalassiothrix. Among the Dinoflagellata we oljtained species of 



Ceratium, of Peridinium, and species of other Peridinida^ ; among the Protozoa 



were a number of Sticholonche ; among the Acantliaria were especially to be 



noticed Acanthometron, Acanthostaurus, Ampliilonche. CoUozoum, Thalassi- 



cola, and a number of Chirospira murravana and a few species of Challongeridaj 



were frequently found. 



