THE OPALINID CILIATE IXFUSORIANS. 209 



from recent division, are spherical or nearly so. The rest are elon- 

 gated, usually much so. The elongated nuclei distinguish it from 

 species somewhat similar in form. 



OPALINA TERRAE-MARIAE, new species. 



Type. — United States National Museum No. 16568. 



Host. — Hyla evittata Miller, one abundant infection, from United 

 States National Museum specimen No. 32106, 43 mm. long, from 

 Easton, Maryland, September 8, 1903, H. L. Clark, collector. 



Measurements of an ordinary individual. — Length of body 0.177 

 mm. ; width of body 0.133 mm. ; thickness of body, anterior 0.01 mm., 

 middle 0.03 mm., posterior 0.0217 mm.; diameter of nucleus 0.004 



Fig. 179. — Opalina tbrbak-mariae, X 117 diameters. 



mm. to 0.00575 mm. ; cilia line interval, anterior 0.0019 mm., middle 

 0.003 mm., posterior 0.0045 mm. 



In spite of the short, broad form of most individuals of this spe- 

 cies, it still seems to be related to the general ohtrigona group, for 

 some individuals show an obtrigona-like posterior end. It seems a 

 distinct species. 



OPALINA COPEI, new species. 



Type.— United States National Museum No. 16586. 



Host. — Rana copei Boulenger, two infections from Pico Blanco, 

 Costa Eica, W. M. Gabb, collector ; of these the type infection is from 

 United States National Museum specimen No. 30654, 42 mm. long. 



