THE OPALINID CILIATE INFUSORIAXS. 217 



sufficiently well preserved to be measured accurately. In figure c 

 note the endospherules ( ? ) invading the ectosarc in great number, a 

 condition not understood. In many species a few endospherules may 

 pass scatteringly into the ectosarc, but in no others has such whole- 

 sale invasion of the ectosarc been observed. 



OPALINA UELENAE PIIYLLOMEDUSAE, new suljapicics. 



Type. — United States National Museum Cat. No. 16578. 



Hos-t. — Phyllomedusa deenicolor (Cope), two abundant infections 

 from ^Mexico, the type infection being from United States National 

 ^Museum frog No. 6037, 53 mm. long, BischofF collector. 



Measurements of an ordinary hulividual. — Length of body 0.3 

 mm. : width of body 0.16 mm. ; thickness of body 0.046 mm. ; diameter 

 of nucleus 0.0031 mm. to 0.0036 mm. ; diameter of endospherule 0.0017 

 mm. to 0.0022 mm. 



.O'o'p* ,*o 





Fii;. 189. — Opali.n'a iiei.enae piiyi.uimedusae : n, .MA<;.\iFirr) 117 I)IAmetki',.s ; 6, a itir 



OF THE BODY MAGNIFIED 4G0 DIAMETKUS. 



This Opalina is similar to 0. helenae, but has shorter cilia and is 

 not sharp-pointed posteriorly in any individual seen. 



OPALINA MORELETEI, new species (flj?. 190). 



T ijiic. — United States National Museum Cat. No. 16577. 



Host. — Agalychnis tnoreJetei (Dumeril), two infections, from 

 (Juaiemala. the type infection being from United States National 

 Museum specimen No. 24827, 65 mm. long, collected by H. Hogue. 



Measurements of a hroad individual. — Length of body 0.287 mm.: 

 width of body 0.1S2 mm.; thickness of body 0.016 mm.; diameter of 

 nucleus 0.00225 mm. to 0.003 mm., mean 0.00275 mm.; diameter of 

 endospherule 0.00075 mm.; cilia line interval, anterior 0.00171 mm., 

 middle ().003 mm., posterior 0.0041 mm. 



There are broader and narrower forms in this species, but none are 

 pointed behind. The nuclei are very small and the cilia are -iiort. 

 The endospherules are minute. 

 83103—23^ 15 



