684 



PROTOZOOLOGY 



H. aesculacantha Jarocki and Jacubowska (Fig. 321, b). 30-52/i by 

 24-40/i ; in stagnant water. 



Fig. 321. a, Astylozoon Jallax, Xl70 (Engelmann) ; b, Hastatella aescula- 

 cantha, X580 (Jarocki); c, Ojnsthonecta henneguyi, X500 (Lynch and 

 Noble); d, e, Ophridiuni sessile (d, Xl.5; e, X65) (Kent); f, 0. vernalis, 

 Xl60 (Stokes); g, Scyphidia constricta, X360 (Stokes); h, Paravorticella 

 clymenellae, X65 (Shumway). 



Genus Opisthonecta Faure-Fremiet. Conical; ends broadly- 

 rounded; a ring of long cilia close to aboral end; adoral zone about 



