476 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 87 



« b 



FiGUEB TS.—Protoopalina octomixa Fantham: a, X 75; b, a nucleus, X 800. (After Fantham.) 



3 in daughter cells with their nuclei recently from division (Fantham's 

 fig. 6) (see dimension under P. caccosterni) . 



Fantham figures an arrangement of the lines of cUia that differs 

 markedly from any I have ever found in any opalinid. In all other 



FiGUEE 3Q.—Protoopalina ovalis Fantham, X 470. (After Fantham.) 



species studied the lines are parallel and spiral. Fantham shows them 

 as converging to the two ends of the body. It would be well to 

 reobserve these animals as to this feature. The liues of cUia were not 

 discovered in my rather poorly preserved F. ovoidea (Metcalf, 1923a). 



PROTOOPAUNA STEJNEGERI Metcalf 



Figure 31 



Host: Ascaphus truei Stejneger, from the Olympic and Siskiyou 

 Mountains in extreme Northwestern United States. 



For the sake of having all known opalinids at least briefly mentioned 

 in U. S. National Museum Bulletin 120 or in this paper, which is 



