Papers to ivhich Reference is Made. 313 



the head with that of the body follows the extension of the an- 

 terior edge of the valves and runs nearly perpendicular to the 

 long axis of the animal. In Pleuroxus, Chydorus and allied 

 genera, this line runs far back toward the posterior end of the 

 valves. Monospilus belongs very plainly to the first group of 

 genera. 



LIST OF PAPERS TO WHICH REFERENCE IS MADE. 



Birge, '78. Notes on Cladocera: E. A. Birge, Madison, 1878. 

 Trans. Wis. Acad., vol. IV. - 



Birge, '91. List of Crustacea Cladocera from Madison, Wis. : 

 E. A. Birge, Madison, 1891. Trans. Wis. Acad., vol. 

 VIII. 



Daday, '88. Crustacea Cladocera Faunae Hungaricse: E. Daday 

 de Dees, Budapest, 1888. 



Eylmann, '86. Beitrag zur Systematik der Europaeischen 

 Daphniden: E. Eylmann, Freiburg i. B. , 1886. Ber. 

 Naturforsch. G-esellsch. zu Freiburg, B. II. 



Forbes, '90. On some Lake Superior Entomostraca : S. A. 

 Forbes, Washington, 1890. Rept. Fish Com., 1888. 



Forbes, '93. A preliminary Report on the Aquatic Invertebrate 

 Fauna of the Yellowstone National Park, Wyoming, and of 

 the Flathead Region of Montana: S. A. Forbes, Washing- 

 ton, 1893. Bull.U. S. Fish Com., 1891. 



Gruber and Weismann, '78. Ueber neue oder unvollkommen 

 gekannte Daphniden : A. G-ruber and A. Weismann, 

 Freiburg, 1878. Ber. Naturforsch. Gesellsch. zu 

 Freiburg. 



de Guerne et Richard, '91b. Entomostraces recueillis par 

 M. Ch. Rabofc en. Russie et en Siberie: J. de Guerne et 

 J. Richard, Paris, 1891. Bull. Soc. Zool. France, 1891. 



