THE OPALINID CILIATE INFUSORIANS. 165 



Measurements: A, of a small individual; B^ of an elongated in- 

 dividual — 



Measurements. 



Length of body 



Width of body 



Thickness of body, anterior 



Width at same level. 

 Thickness of body, middle 



Width at same level, 

 Thickness of body, posterior 



Width at same level, 



Length of nucleus — 1 N 2 



Width of nucleus ^l'\ 



Length of endospherule 



Width of endospherule 



CiUa line interval: 



Anterior 



Middle 



Posterior 



The shorter and intermediate forms of this Cepedea quite closely 

 resemble C. hispanica, but the more elongated forms approach C. 

 longa, or better, C. ophis in shape. This species evidently shows 

 a nearer approach to the very elongated species than does C. his- 

 panica. The cilia are quite long, longer than in G. dvmidiata and 

 its several subspecies, longer than in G. longa^ but not so long as in 

 G. ophis and G. segmentata. If these species were arranged in 

 natural series they would be in the order G. dimidiata, G. hispanica, 

 G. multiformis, G. ophis, G. longa. We will, however, take up 

 later the latter two forms in reverse order without implication as 

 to phylogeny. 



CEPEDEA MULTIFORMIS [or POLYPEDATES SCHLEGEUIJ, new subspecies (?) (fig. 134). 



A specimen of this form has been deposited with the United States 

 National Museum as Cat. No. 16529. 



Host. — Polypedates schlegeUi Guenther, four infections, from 

 Japan. The type infection is from United States National Museum 

 specimen No. 23589, 48 mm. long, from Yokohama, September 1896 ; 

 L. Stejneger collector. 



Measurements. — Length of body 0.26 mm. ; width of body 0.06 mm. ; 

 length and width of nucleus, first nucleus 0.0055 mm. by 0.0028 mm., 

 second nucleus 0.0055 mm. by 0.0037 mm. (mean), third nucleus 

 0.0065 mm. by 0.00376 mm. ; diameter of endospherule 0.0013 mm. to 

 0.0016 mm. ; cilia line interval, anterior 0.0025 mm. 



This form seems very similar to the species type, although it is 



