396 OHIO BIOLOGICAL SURVEY 



35. T. raciborskii Wolosz. (Fig. 11, PI. XX). 



Oval, surface thickly covered on both ends with heavy short 

 spines ; flagellum 3 times length of body. 

 L. 40/x. D. 30/i. 

 Distribution, Java. Plankton of Sawa River. 



*36. T. globularis (Awerinz.), (Fig. 12, PI. XX). 



Spherical, covered with short scattered spines ; flagellum open- 

 ing without collar although an annular thickening often present; 

 flagellum? 



L. 20/x. 



Distribution, Russia (Bologoje). North America (Gambler, 

 Ohio). 



Specimens which must be referred to this species were found 

 in a sample of water from a pool at the foot of Bishop's Hill, 

 Gambler, Ohio, and also from the Cincinnati Storage Reservoir. 

 The shell was green in color and covered with short blunt spines 

 regularly arranged. No prominent collar was noticeable. 



D. 27/x. 



37. T. westii Wolosz. (Fig. 13, PI. XX). 



Broadly oval, slightly widened anteriorly ; thickly covered with 

 extremely fine spicules ; flagellum ? 

 L. 18/x. D. 15/x. 

 Distribution, Java. Plankton of Bawa River. 



*38. T. americana Lemm. (Fig. 14, PI. XX). 



Spherical, with about 12 extremely long (12^() spines scat- 

 tered irregularly over surface and with a cylindrical collar 7/* 

 in height with spherical enlargement on the end ; flagellum ? 



Li. 13/x. 



Distribution, North America. With Eunotia pectinalis 

 (Kiitz.). Mirror Lake, O. S. U., Columbus, O. 



39. T. aegyptiaca Lemm. (Fig. 15, PI. XX). 



Spherical, thickly covered with fine spines; with prominent 

 collar and posterior spike; flagellum ? 

 L. 56.4/i. 

 Distribution, Cosmopolitan? Standing water. 



