8 THE GENUS TRACHELOMONAS, 



Nearly all the forms described in this paper have been ob- 

 served in a living condition, the character of the flagellum and 

 of the body in each case leaving no doubt that the organism was a 

 genuine Trachelomonas. The specimens were carefully measured 

 in detail, and drawn mostly to the scale of 1500 diameters, which 

 has been reduced in the reproduction to 1000. The magnifica- 

 tion employed in observation was that of ^ inch objective with 

 lodiam. ocular. 



INFUSORIA. 



Family EUGLENIDJE Stein. 



Genus Trachelomonas Ehr. 



Synonyms : — Lagenella pro parte, Chcetoglena p.p., and Chceto- 

 ty'phla*' Ehrenberg; Lagenella Schmarda; Cryptoimonas Dujardin 

 p.p., (Jhonemonas and Trypemonas Perty; CryjAoglena Clap, et 

 Lachmann; Lagu7icula Fisher, Proc. Araer. Soc. Micros., 1880. 



Trachelomonas volvocina Ehr. (PI. i., f.l). 



Diam.5, 10, 12, 16, 18, 20, 22, 24, 25, 26, 27, 30 /x. 



Everywhere, very common. 



Lorica perfectly spherical, with smooth clear membrane pale 

 yellow to dark red. Very seldom found with a neck. Sizes over 

 27 i-L diam. are very rare; I have observed only a single specimen. 

 Dangeard, Les Eugleniens, p. 128, has included oval forms in this 

 species; these, however, belong to Track, interinedia Dang., q.v.^ 

 var. levis mihi. 



Var. PELLUCIDA Playf. 



Diam. 4-10 //.. Lorica quite colourless. 



Botanic Gardens 158; Auburn 139; Lismore 176, 183. 



Cf. Biol. Richm. R., these Proceedings, 1914, p. 141, PI. viii., 

 f.3. Klebs, Organis. einig. Flagellatengr., p.319, has noted a 

 variety, y hyalina, but, in his form, it is the body that is colour- 

 less, without chlorophyll. 



* Senn, Flagellata, p. 176, gives the name as Chcetophlj/a Ehr.; Stein and 

 Lemmermann refer to it as GhcvtotypJUa Ehr. 



