SUBCLASS EUFLAGELLATA 



333 



divided into two suborders after the method of Hartmann and 

 Chagas, which is as follows: — 



A. No tendency to bilateral symmetry in undividing forms- 



Suborder I, Monozoa Hartmann and Chagas, 1911. 



B. More or less tendency to bilateral symmetry in undividing 



forms — Suborder 2, Diplozoa Hartmann and Chagas, 1911 . 



Suborder I. Monozoa Hartmann and Chagas, 1911. 



Definition.- — Protomonadina without tendency to bilateral sym- 

 metry in undividing forms. The anterior flagella vary from one to 

 many, in addition to which a trailing fiagellum or undulating mem- 

 brane may be present. 



Classification. — ^This suborder can be divided into_some ten 

 families as follows : — 



Diagnostic Table of the Monozoa. 



A. One -fiagellum f resent : — ■ 



L With a collar — Family i, Craspedomonadidce Stein, 1878. 

 n. Without a collar : — 



{a) Einetonucleus not separate from the nucleus — 



Family 2, OicomonadidcB Senn, 1900. 

 {h) Kinetonucleus separate from the nucleus — ■ 

 Family 3, Trypanosomidce Doflein, 1901. 



B. Two flagella present : — 



I. Both anterior: — • 



(a) Unequal — ^Family 4, Monadidce Stein, 1878, emen- 



davit Senn, 1900. 

 (6) Equal — Family 5, AmphimonadidcB Kent, 1880, 

 emendavit Biitschli, 1884. 

 n. One anterior and one trailing fiagellum: — • 

 \a) Trailing fiagellum free :— 



1. In horny sheath and with lip or proboscis-like 



process — Family 6, Bikcecidce Stein, 1878. 



2. Without sheath or process- — Family 7, Bodo- 



nidcE Biitschli, 1884. 

 (h) Trailing fiagellum in part attached to the body — 

 Family 8, Cercomonadidce Kent, 1880, emendavit 

 Biitschli, 1884, 



C. Three to six anterior flagella, with or without one trailing 



fiagellum (except Emhadomonas with one anterior and one 

 cytostomic fiagellum) — Family 9, Tetramitidce Kent, 1880. 



D. Numerous anterior flagella — Family 10, Callimastigidce da 



Fonseca, 1915. 



Of these ten families we are concerned with only five, of which one, 

 the Trypanosomidse, because of its importance, we shall leave till 

 tne next chapter; so that at present we will consider the following 

 families only: — • 



