370 Illinois State Laboratory of Natural History. 



FURCULARIA Ehrbg. 



Body generally larviform, cylindrical, with a tendency to 

 enlargement in the lumbar region ; front conical, broad, and 

 deep ; eye single, frontal, sometimes wanting ; incus forci- 

 pate, much developed, protrusile ; toes two, furcate, usually 

 conspicuous. 



39. F. forficula Ehrbg. 



This species was scarce, being taken only in May, 1896, 

 in surface towings at the mouth of Quiver Lake. 



40. F. longiseta Ehrbg. 



This rather peculiar form was found only in Quiver Lake. 

 In July and August, and once in March, a few were taken. 

 It occurred both among vegetation and in the towings. 



EOSPHORA Ehrbg. 



Body oblong, head dilated and furnished with protrusile 

 auricles; foot very distinct, with telescopic joints and fur- 

 cate toes ; eyes three, one large, cervical, two minute, frontal. 



41. E. aurita Ehrbg. 



One morning in July, 1894, we saw a large quantity of red 

 scum on the river. Upon examining it several specimens of 

 this rotifer were found. In September of the same year it 

 was again found, on the west shore of Quiver Lake, among 

 vegetation. 



DiGLENA Ehrbg. 



Body subcylindric but very versatile in outline, often swell- 

 ing behind and tapering to the head ; eyes two, minute, 

 situated near the edge of the front ; foot furcate, trophi forci- 

 pate, generally very protrusile. 

 4 '2. D. g-randis Ehrbg. 



This large form was found only in Quiver Lake in 1894, 

 once in August, and again in October. 

 43. D. catellina Ehrbg. 



Tills species was found in small numbers during August in 

 the red scum at the mouth of Quiver Lake. 



