1025 



Öfversigt af Kougl. Vetensknps-Akiulemiens Förhandlingar 1900. N:o 9. 



Stockliolni. 



Plankton from the Red Sea. 

 By P. T. Cleve. 



(Commuiiicated 1900, November 14.) 



I have received two sets of plankton samples from the Red 

 Sea, one coUected by the late Swedish naturalist Dr. E. Nyman, 

 from the 25th of February to the Ist of March 1897, and an- 

 other by the lamented Swedish zoologist Dr. C. AuRiviLLlus, 

 from the 19th to the 24th of February 1899. No observations 

 on the teraperature of the water or the salinity correspond to 

 the samples collected by Dr. Nyman, which were examined for 

 phytoplankton and tintinnodea only. The collections of Dr. 

 AüRiviLLius are accompanied by observations on the temperature, 

 and simultaneously samples of water were taken for determining 

 the salinity by"Prof. 0. Pettersson, who kindly communicated 

 the hydrographical data, mentioned in the following. 



In the following report on the plankton of the Red Sea I 

 have included some data, concerning the copepoda, published 

 by GiESBRECHT in his work »Systematik und Faunistik der pela- 

 gischen Copepoden:> Berlin 1892. 



Copepoda. 



Acartia centrura Giesbr. — Assab (Giesbr.). — Not noted 

 outside the Red Sea. 



A. erythraea Giesbr. — 13° — 16° N. 43' — 41" E. {temp. 

 24,5—24,8; sal 36,35—37,41). — AssAB (Giesbr.) ^ I found 

 this species in samples from the Malay Archipelago. 



