Protozoa and Hot if era at Hnvana, III. 365 



the preceding species it is omnivorous. Aster lonclla, Pedi- 

 astridii, Volvox ijlo])ator, Codonella cratcra, Anurcea tecta, and 

 A. eochlearis were common in its food. 



21. A. herrickii de Guerne. 



The record of this species presents a similar history for 

 each of the two years. It appeared in April and May, reach- 

 ing its maximum in May ; was not seen at all in June, and 

 but once in July; and in August and September it occurred 

 extensively, but was not common. Like A. 2)t'iodonta, it 

 was found in the river and more permanent lakes, — Quiver, 

 Dogfish, and Thompson's, — but not in the two shallower 

 lakes, Phelps and Flag — liable to dry up more or less in late 

 summer. 



Professor Forbes, in studying this species, found several 

 small parasites within the body. They were apparently one- 

 celled, very changeable in shape, and seemed to have three 

 fiagella-like pseudopodia. 



Two specimens of BrachiouKs iniliteiris were found in the 

 stomach of one example of this Asplanclina, and Auiinea 

 eochlearis, Volvox glohator, and Bosinina also serve as food 

 for it. 



22. A. girodi de Guerne. 



Taken only in towings from Flag Lake, during April, 1896. 



ASPLANCHNOPUS DE GuERNE. 



Like Asplanchna, but with a ventral retractile foot, ending 

 in two toes. 



23. A. myrmeleo Ehrbg. 



Xotommata myrmelpo Elirbir. 



This fine large rotifer was present in small numbers from 

 May to September. It occurred in collections from Quiver 

 Lake, Dogfish Lake, and the Illinois Piiver, and was found 

 both in the open water and among vegetation. Individuals 

 can be easily recognized in the water without a lens by their 

 large size and sluggish movements. They are great eaters, 

 and their stomachs are almost invariably filled with other 

 rotifers and crustaceans, sometimes so gorged with food that 



