Protozoa (ind Iiofifeni at Havana, III. 869 



October. It seems to be most at home creeping among the 

 vegetation, such as was so abundant at substation C in 

 Quiver Lake. 



A very fine rotifer, arresting the attention by its unusual 

 activity and attractive lorica. 



Family NOTOMMATIDiE. 



Taphrocampa Gosse. 



Body fusiform or cylindrical, annulose, furnished with two 

 furcate toes ; tropin forcipate ; cilia very limited or wanting. 



34. T. annulosa Gosse. 



Infrequent, l)eing found only at substation C in Quiver 

 Lake, among vegetation and in open water, from July to 

 September of the first year. 



NOTOMMATA GosSE. 



Body cylindrical, not annulose, furnished ])ehind with a 

 projecting tail; evertile and protrusile ciliated auricles on 

 the head ; brain large, usually containing opaque chalk 

 masses ; trophi virgate. Numerous species, in some of which 

 one or more of these characters may be lacking. 



35. N. aurita Ehrug. 



Infrequent ; taken among vegetation in the Illinois Eiver 

 in July. 



36. N. cyrtopus Gosse. 



Infrequent, occurring during February in towings from the 

 Illinois Eiver. 



37. N. tripus Ehrbg. 



Occurred only during June and July, in both surface and 

 bottom towings from Quiver Lake. 



38. N. lacinulata Ehrbg. 



This form was found once, in July, when a few were taken 

 among the vegetation at the mouth of the "Pumpkin Patch ;" 

 a bay full of wild rice and other vegetation, communicating 

 with the west side of Quiver Lake, near the head of the lake. 



