JUN 2 1898 

 ARCHIV FOR MATHEMATIK OG NATURVIDENSKAB. B. XX. Nr. 4. 



On some South-African Pliyllopoda raised 

 from dried mud. 



With 4 autographic Plates. 

 Bv G. 0. Sars. 



Introduction. 



On the 13th April of last year (1897) I received, through 

 the kindness of Mr. J. V. Hodgson of the Biological 

 Association of Plymouth, a considerable quantity of dried 

 mud taken by his brother from a shallow lake («vley») in 

 the neighbourhood of Port Elizabeth, Cape Colony. Though 

 the mud at first sight did not present any promising aspect, 

 it was found, on a preliminary microscopical examination, to 

 contain a quantity of ephippia of a Daphnia, and detached 

 valves of one or two species of Cypris. Moreover, some 

 fragments of the carapace of an Apus, and of the shell of 

 an Esiherià, were detected, and these facts seemed indeed 

 to prove that the mud was serviceable for hatching opera- 

 tions. These were immediately entered upon, several aquaria 

 being arranged to receive small parcels of the mud. My 

 first attempts, however, were by no means successful, probably 

 owing to the comparative lowness of the temperature at that 

 time. But in the course of the following month (May), when 

 warm, sunshiny weather prevailed, the hatching went on in 



