PLANKTON-TYPES. DE.SMO-PLANKTOX. 



23 



Limi 



Phalcroma cuneus 3° S.— 



P. dorypliorum 12"^ S.— 



P. Hindmarchii 9^N.- 



P. rapa 20° S.- 



P. operculalum 17° S.— 



Podolampas bipes 16° S.- 



P. palmipes 20° S.- 



Pyrophacus horologium .. 20° S.— 



Steiniella mitra 7°N.- 



Pyrocystis fusiformis 29° S.— 



P. pseudonoctiluca 25° S.- 



Asterolampra marylandica 9°N.— 



A. rotula 21° S.- 



Cha)loceros peruvianus... 21° S.— 



C. coarctatus 25° S.- 



C. tetrastichon 10° N.- 



Climacodium biconcavum 26° S.- 



C. Frauenfeldianum 12° S.- 



Hemiaulus llauckii 24° S.- 



H. Heibergii 6° N.- 



Rbizosolenia acuminata.. 35° S.— 



R. Castracanei 35° S.- 



TrichodesmiumThiebaultii 26° S.- 



It appears from the above li.st that the animal plankton is re- 

 presented by a considerable number of copei^oda, tintinnodea and 

 radiolaria. The ))hytoplankt()n is poor in diatoms, in respect to both 

 the numl)er of species and the number of individuals, the bulk of it 

 being re[)resented by Triclindc^ntliinK Pi/roci/sds and various dino- 

 flagellates. 



Most of the species of the l)esmo-plankton go far 1o the south 

 and as a rule to 40° or 50° N. Nevertheless, some species may 

 occasionally and as rare specimens drift together with the Styli- 

 lankton still faiiher norllnvaids, or to about 60° N. Most of thed 

 species of the Desmo-plankton occur besides in the Mediterranean, 

 many of them also in the l*acilic and the Indian Ocean. 



