Protozoa and Roti/cra at Havana, III. 317 



second circlet of cilia sometimes present at the 

 opposite end of the body. Three families. 

 2. Subclass Suctoria. Cilia present only in the free- 

 swimming young ; food absorbed by tubular tentacles ; 

 reproduction by budding, rarely by division. Eight 

 families. 



Class 8ABC0DINA. 



Subclass RHIZOPODA. 



Order EHIZOPODA. 



Family AMOEBID^. 



Amoeba Boky. 



Body naked, with pseudopodia; contractile vacuole and 

 nucleus present; reproduction by bipartition in the active 

 condition. 



1. A. proteus Rosel. 



This species appeared only in towings from the river chan- 

 nel at E in September. 



2. A. radiosum Ehrbg. 



A few examples of this interesting form were taken in the 

 tow-net in Phelps Lake in July. 



Pelomyxa Greeff. 



Amceba-like, naked, usually quite large (up to 2 mm. in 

 diameter), moving by means of short, broad pseudopodia, and 

 commonly more or less slug -like when in motion. Nuclei 

 very numerous. 



3. P. villosa Leidy. 



This was found sparingly in June, July, and August : in 

 July with the preceding species in towings from Phelps Lake ; 

 and on the other occasions at C in bottom towings and in col- 

 lections from the vegetation along the east shore. 



