PELAGIC AND IXTER^MEDIATE DEPTHS FAUNA. 15 



Euphausiaj witli other Schizopods and Ilyperids and Amphipods consti- 

 tuted the mass of pelagic animals at Stations 4G54 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 snrface lianl contained mainly transparent 

 types : Sagitta, Doliolura, Pteropods. 



Plalobates 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 Salpa?, of Cytosis, 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 Salpa?, at Stations 4650, 4660, and 4709. They contained among 

 other Diatoms : Planktoniella, Rhizosolenia, Coscinodiscus, Asteromphalus, 

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

 and a great number of Radiolarians : 



Acanthonia CoUosplucra Coelddeiidrum 



Acanthochiasma Ellipsostylus Dorotas})idio 



Acantlioinetron Hexalouche Acantluu'ia 



Zjgaeantha Diploeonus Lithocampe 



Acantliostaurus Haliomina Aulos[)li;eia 



Quadrilonclie Covonidiuiu 



Astrolophus Rhopalastruni 



Between Panama and the Galapagos and from the Galapagos to Callao 

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

 Tuscarusa, Aulosphcera, and others. In depths of 300 fathoms to the surface, 

 the tow-net was rich in Tintinnida^, either dead or moribund Planktoniella^, 

 and Dinoflagellata. Among these were species of Ceratium, of Peridinida3, 

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

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

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

 Ceratium, of Peridinium, and species of other Peridinidte ; among the Protozoa 

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

 noticed Acanthometron, Acantliostaurus, Amphilonche. Collozoum, Thalassi- 

 cola, and a number of Chirospira murrayana and a few species of Challengeridae 

 were frequently found. 



