162 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



spherule 0.001 mm. ; cilia line interval, anterior 0.0012 mm., middle 

 0.0024 mm., posterior not clear. 



This large Cefedea^ though found in a subspecies of Rana esculenta, 

 differs clearly from the Cepedea found in the latter host. It is a 



r 



a 



large, slender form with all its nuclei oval. 

 It belongs more to the longa group than 

 to the dimiduita group, though its short 

 cilia and small endospherules are like 

 those of C. dimidiat<j(. It seems as in- 

 termediate species between the dimidiata- 

 like forms and the very elongated forms. 

 Many of the individuals in my infections 

 are coiled and twisted, as I have never 

 seen C. dijiiidiata^ and as G. longa usually 

 is found to be. Its oval nuclei also are 

 longa-\\kQ. 



CEPEDEA CANTABRIGENSIS, new species. 



O Q- 



>o O' 



OO 

 O O 



0" 



O O 



o 



P-O 



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Type. — United States National Museum 

 Cat. No. 16552. 



Hosts. — RaTia cantdbr'igensis Baird, five 

 infections, from northwestern United 

 States and Manitoba ; and Rana cantahn- 

 gensis latiremis (Cope), five infections, 

 from Alaska; of the latter the type in- 

 fection is from United States National 

 Museum specimen No. 15488, from Fort Cosmos, northern Alaska; 

 Stoney, collector. 



Measurements of a inediuni-sized individual. — Length of body 

 0.346 mm.; width of body 0.084 mm.; length and breadth of nuclei, 

 first nucleus 0.005 mm. by 0.004 mm., second nucleus 0.00575 mm. by 



= nOO 



Pig. 130. — Cepedea his- 

 panica, x 460 diam- 

 ETERS. 



