Protozoa and Rot if era 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 SABCODINA. 



Subclass RHIZOPODA. 



Order BHIZOPODA. 



Family AMOEBID^. 



Amoeba Bory. 



Body naked, with pseudopodia ; contractile vacuole and 

 nucleus present ; reproduction by bipartition in the active 

 condition. 



1. A. proteus Bosel. 



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. 



Amoeba-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. 



