166 The Mastigophora 



C, D), Hollande's system seems to have certain advantages in the present 

 stage of taxonomic progress. 



Suborder 1. Euglenoidina. These flagellates have one or more flagella, 

 may or may not contain chlorophyll, are not holozoic, may be metabolic, 

 or may have a rigid pellicle. The flagellar sheath is not swollen at the 

 base. On the basis of flagellar equipment, Hollande (110) recognized 

 the families Euglenamorphidae, Eutreptiidae, Distigmidae, Euglenidae, 

 and Menoidiidae, but the erection of definitive families may require more 

 information than is now available. 



The following genera may be assigned to the suborder: Ascoglena Stein (202; Fig. 4. 

 33, N); Astasia Dujardin (236, 238, 239, 240; Fig. 4. 35, C, E, H, I); Colacium Ehren- 

 berg (123, 202; Fig. 4. 35, O, P); Cryptoglena Ehrenberg (202; Fig. 4. 35, F); Distigma 

 Ehrenberg (108, 172, 236; Fig. 4. 35, Q), without chroraatophores; Distig)nopsis Hol- 

 lande (110; Fig. 4. 35, A); Euglena Ehrenberg (124, 202; Fig. 4. 34, A-D. G); Euglena- 

 morpha Wenrich (277;, Fig. 4^ 33, B), from tadpoles; Eiitreptia Perty (202; Fig. 4. 35, 

 B); Eutreptiella da Cunha (Fig. 4. 34, E); Hyalocephalus Pringsheim (236), a colorless 



Fig. 4. 36. A. Peranemopsis striata Lackey; one long anterior flagellum; 

 no second flagellum like that of Peranerna, and only one pharyngeal-rod; 

 length, 90-110^ (after L.). B. Urceolus cyclostomus (Stein) Mereschkowski, 

 showing vestibule, reservoir, pharyngeal-rod apparatus, nucleus, ingested 

 food; x933 (after Klebs). C. Peranerna trichophorum (Ehrbg.) Stein, 

 slightly contracted, ventral vieu' showing pharyngeal-rod apparatus and 

 trailing flagellum adherent to the body; in swimming, the anterior flagel- 

 lum (shown in part) is extended as in Peranemopsis (A); schematic (after 

 Chadefaud). D. Pharyngeal-rod apparatus of P. trichophorum, right lateral 

 aspect; schematic (after Chadefaud). E. Heteronema acus (Ehrbg.) Stein; 

 ingested Euglena in a food-vacuole not yet separated from the reservoir; 

 flagella shown leaving cytostome; x2240 (after Loefer). 



