studies on niariiU' Oslnuods 



U).-) 



and c-bristles of the male first antenna and the development of the endopodite of the 

 second antenna in the male. 



With regard to the b- and c-bristles on the first antenna of the male one might say with 

 fairly great certainty that originally in the sub-ordo Cypridinifarmes they were not provided 

 with suctorial organs for seizing the female. For in this group an equipment of this kind has 

 so far been observed only in the sub-family Cypridininae; in all the representatives known 

 so far of the sub-family Philomedinae and of the families Rutidermatidae. Sarsiellidae and 

 Asteropidae such organs are, on the contrary, entirely lacking. 



With regard to the other of the two characters mentioned one might say with equally 

 <>ieat certainty that the endopodite of the male second antenna in the Cypridiniformes was 

 originally developed as a more or less powerful, three-jointed clasping arm used for seizing 

 the female. As early as 1890 (p. 218) G. W. MtJLLER expressed this view. This assumption is 

 supported by the occurence of an endopodite modified in this way both in the sub-families 

 Cypridininae and Philomedinae and in the family Asteropidae. In the family Sarsiellidae tracer 

 of such a development can still be verified. In the family Rutidermatidae males are unknown. 



A classification of the genera belonging to the sub-family discussed here according to 

 these two characters shows the following result: 



The b- and 

 c-bristles 

 with 



suckers. 



\ 



The b- and c-bristles have proxi- 

 mally a rather short and powerful 

 branch, furnished at about the 

 middle with a rather large and 

 powerful sucker; distally of this 

 (jne or two rather long and power- 

 ful branches are found, which have 

 distally one or usually a row of 

 very small suckers all of about 



the same size. 

 The b- and c-bristles with a power- 

 ful rather long branch, furnished 

 distally with a number of suckers 

 of moderate size, all arranged in 



an umbel. 

 The b- and c-bristles with one or 

 more rather short branches all 

 with a rather powerful sucker in 



the middle. 



Cypridinodes 

 Cypridina 

 (sensustr. etmeo) 

 Macrucypridina 

 Vargula 



Dolona 



The endopodite of the 



male second antenna 



is not developed a,s a 



clasping organ. 



Codonocera 



The b- and 

 c-bristles 



without anv' | 

 suckers. ' 



(ugantocypris 



Crossophorus 



The endopodite of the 

 male second antenna 

 ileveloped as a power- 

 ful clasping organ. 



CUissijicalioii nccor- 



diivg to lliexf 



rlinrnrlcrs. 



