Protozoa and Rot if era at Havana, III. 38^8 



102. A. aculeata Ehebg. 



This is a winter species. It was present in towings from 

 all the substations from November to June, reaching its 

 greatest abundance in May. 



103. A. aculeata valga Ehrbg. 



Found in towings from the Illinois Eiver and Thompson's 

 Lake during April, 1895. 



104. A. cochlearis Gosse. 



This was the commonest representative of its genus, and 

 was present every month in the year, most abundantly from 

 April to September. It was found in towings from all of the 

 substations. 



105. A. serrulata Ehrbg. 



Found once — in a towing from the Illinois Eiver in Decem- 

 ber, 1895. 



NOTHOLCA GosSE. 



Lorica ovate, truncate and six-spined in front, sometimes 

 produced behind ; dorsal surface marked longitudinally with 

 alternate ridges and furrows ; extruded eggs not usually 

 carried. 



106. N. acuminata Ehrbg. 



This is clearly a winter species, being present during both 

 years in towings at nearly all of the substations from October 

 to May. It reached its greatest abundance during March 

 and x\pril. It was found both among vegetation and in open 

 water. 



107. N. long-ispina Kell. 



Found only in towings from the Illinois Eiver in Janu- 

 ary, 1895. 



• Order IV. SCIETOPODA. 



Family PEDALIONIDiE. 



Pedalion Hudson. 



Limbs arranged around the body in pairs, and parallel to 

 its longitudinal axis ; two stylate ciliated appendages on the 

 posterior dorsal surface. 



