130 Record?; of ihe Indian Muf^euw. [Vol. XV, 



b. With C. V. 



a^. ('. V. in a single row. 

 a". Body oval. 



a^. Body straight dorse -ventrally. 



a'*. Body (^ongately oval, length = 3 to 5 times the breadth ; sometimes 

 obliquely truncate posteriorly. C. V. 9-10 or more ; macronucleus 

 elongated and axial. 



.3. A. naidos. Stein (A. ivermis, Kent.) 



b*. Body elongately oval with rounded ends ; length equal to or les.' than 

 twice the breadth ; 0. V. large, 3-5 in number ; raacionucleus elongately 

 oval. 



4. A. ovata. Clap. 



b'. Body curved dorso- ventrally in a longitudinal direction, oval with rounded 

 ends; C. V. 4-6 in number; long ribbon-shaped macronucleus with 

 rounded ends. 



5. A. cojivexa. Clap, 

 b'-. Body not oval in shape. 



a*. Body bilobed with a constricted portion in the middle ; anterior lobe 

 swollen and oval ; posterior lobe less so and pointed behind ; C. V. 

 4-7 in number ; macronucleus oval and placed at the anterior end. 



G. A. ccchJcariformis, Leidy. 



b^. Body not bilobed. 



a*. Body elongately club-shaped ; dilated anteriorly and obliquely trun- 

 cate ; posterior end attenuate, rounded or acuminate ; V. V. or 7 ; 

 longitudinal striae lew in i vimber with distinct intervals. 



7. A. davnia, Leidy. 



b*. Body elongated and vermiform. 



a^. Body cylindrical, little or not flattened, rounded anteriorly and 

 acutely pointed posteriorly ; cilia long ; C. V. 7 ; macronucleus 

 with club-shaped anterior end. 



S. A. qxtranoides, Pierantoni (5). 



b^. Body flattened ; macronucleus ribbon-shaped ; C. V. numerous (about 

 30 in number). 



a^ Animal free-swimming with ordinary movement, mieronucleus 

 spherical and granular. 



9. A. filnm. Clap.* 



b^. Animal moving by vermicular contractions of the body ; micro- 

 nucleus inconspicuous. 



10. A. vermuiiJaria, Leidj'.* 



b^. C V. in 2 rows. 



a^. Body oval in shape, 



a^. Body oval, more pointed anteriorly than posteriorly, sometimes both 

 ends rounded • macronucleus with lateral expansions (not distinctly 

 branched) and with a distinct nucleus membrane ; mieronucleus fusi- 

 form and placed obliquely in the outermost layer of endojalasm at a 

 distance from the macronucleus. 



11. A. ulhiri, Cepede. 



}>^. Body elongately oval, widest anteriorly, often with a number of satellites 

 {A. prolifera), macronucleus axial, band-like ; mieronucleus fusiform in 

 posterior body half. 



12. A. modulata, Miiller. 

 {A. brasilii, Leg. and D^lbosc•q). 



c^ Body triangular, narrow and rounded anteriorly, truncate posteriorly. 



13. A. jxicJn/drili, Clap, 

 c^. C. V. scattered irregularly. 



a^. Body curved dorso -ventrally in a longitudinal direction. 



* The species A . filvm and A . vermicularis are considered identical by Schewiakoff (6), 

 but are taken to be distinct and separate by Cepede (2). 



