THE EUGLENOIDINA OF OHIO 423 



than body; secondary flagellum a little longer than primary 

 flagellum. 



L. ISjLi. D. 7fi. 



Distribution, Europe. Standing water. 



12. Gen. MARSUPIOGASTER Schewiakoflf. 



Rigid, elongately striate ; periplast thin ; 1 primary and 1 sec- 

 ondary flagellum, the latter equal at least in length to the former, 

 and both arising from a pocket-like excavation; reproduction un- 

 known ; swimming with a trembling movement. A single species. 



1. M. striata Schew. (Fig. 5, PI. XXVI). 



Oval, flattened, anteriorly obliquely truncate; primary flagel- 

 lum as long as body ; secondary flagellum 1 V-2 times length of body. 

 L. 27/x. D. 15/x. 

 Distribution, Sandwich Islands (Oahu). 



13. Gen. ENTOSIPHON Stein. 



Form oval, short, slightly compressed ; ventral furrow absent ; 

 two flagella, each approximately the length of the body, arising 

 from the depression at anterior end ; mouth anterior opening into 

 a tube through which nourishment is taken in the form of small 

 granules ; pellicula with longitudinal carinae or furrows ; principal 

 vacuole vvdth several small accessory contractile vacuoles; move- 

 ment creeping, often with a trembling motion. 



Habitat, fresh water and marine. 



Distribution, cosmopolitan. Three species. 



TABLE OF SPECIES. 



Ai Pellicula with distinct longitudinal furrows; rod-like organ 

 attaining posterior part of body. 



B^ Furrows 4-8 in number .... I.E. sulcatum 



B- Furrows 10-12 in number 2. E. ovatuni 



A^ Pellicula with only indistinct furrows; rod-like organ ex- 

 tending only half the length of the body . . . 3. E. obliquum 



*1. E. sulcatum (Duj.) (Fig. 6, PI. XXVI). 



Oval, emarginate anteriorly; 4-8 longitudinal striae; primary 

 flagellum about as long as body; secondary flagellum slightly 

 longer than body; rod-like organ attaining posterior part of the 

 body. 



