364 Illinois State Laboratory of Natural History. 



Callidina Ehrbg. 



Eyes wanting. 



17. C. elegans Ehrbg. 



This species was found once, in September, in towings 

 from Dogfish Lake. 



Order III. PLOIMA. 



Family ASPLANCHNIDiE. 



\ ASPLANCHNA GossE. 



Body sac-like, foot wanting; corona with two apices; 

 tropin (Fig. 3, F), two plates working together like the jaws 

 of an insect, not inclosed within a mastax. Viviparous. 



18. A. ebbesbornii Hudson. 



This large species was found once during June, in a surface 

 towing from the river at E, in company with A. priodonta. 

 So far as I know, it has not been previously recorded from 

 the United States. It is a fine, attractive form, and not 

 easily confused with other species of this genus. 



19. A. brightwellii Gosse. 



This form was the most abundant representative of its 

 genus in the field studied by us. It was widely distributed 

 among the various substations, and present during nearly the 

 entire year, reaching its maximum in July and August. It 

 appropriates almost everything in the way of food: Asteri- 

 oitclla, Codonclla cratera, iJi^ffiiu/ia glohnlosa, Anunea coch- 

 l(((ris and .1. tecta have all been found in stomachs of 

 individuals of this species. 

 20 A. priodonta Gosse. 



This species was found from April to September in both 

 years. In 1894 it was most abundant in May and June, and 

 in 1895 the maximum was reached in August. It occurred 

 mostly in towings from the Illinois River and from Thomp- 

 son's Lake, but was also fcnmd in Quiver and Dogfish lakes. 

 This form, like most of the members of this genus, is dis- 

 tinctively pelagic. None were found among vegetation. Like 



