218 BIOLOGICAL SURVEY OF 



LITERATURE 



BiRGE, E. A. 1918 The water fleas (Cladocera). "Ward and Whipple: Fresh- 

 water Biology, pp. 676-740, 121 fig. 



LiLLJEBORG, WiLHELM 1901 Cladocera Sueciae. Nova Acta Reg. Soc. Sci. 

 Upsal., ser. 3, vol. 19, pp. i-vi, 1-701, 87 pi. 



Order COPEPODA 

 Suborder BRANCHIURA (Fish Lice) 



Argulidae 

 Argulus 0. F. Miiller 

 A. ruNDULi Kroyer. (Wilson, 1902, p. 710, pi. 14.) Taken 

 in some numbers from Fundulus heteroclitus. Stations: 

 S 6, 10. 



Suborder EUCOPEPODA 



This extensive group has been divided by G. 0. Sars and 

 Brehm into 9 tribes, of which 7 are represented in our fauna. 

 Whether this very convenient system will stand the test of 

 embryological investigation remains to be seen. I will here 

 refer the reader to two discussions by Gurney (1931, pp. 22- 

 25; 1932, pp. 1-3) in his volumes on the British fresh -water 

 copepods. 



The work by Gurney just mentioned and the volume by 

 Sars on the Copepoda in his 'Account' should be familiar to 

 anyone attempting work on this group. For the parasitic 

 forms, the long series of papers by C. B. Wilson are the best 

 existing treatise. 



Key to the tribes of Eucopepoda 



1 The last cephalothoracic segment firmly 

 joined to the preceding and movably ar- 

 ticulated to the genital (first abdomi- 

 nal) segment. Fifth feet asymmetric 

 in male ; symmetric, wanting, or rarely 

 asymmetric in female. Eeproductive 

 organs asymmetric in male. Heart 



present Calanoida 



The above characters not combined ... 2 



