214 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Note the ectosarc, very wide except at the anterior end of the body, 1 

 where it is so narrow as hardly to be discernible. 



Fig. 184. — Opalina chorophilIj from Chokophilu.s tuiseriatus, X 117 diameters. 



Opalina chorophiU, United States National Museum specimen 

 No. 16570. 



Host. — Chorophilus occidentalis (Baird and Girard), two infec- 

 tions, one from Georgia, another (from which were taken the para- 

 sites deposited in the United States National Museum) from United 



States National Museum 

 specimen No. 29189, 32 

 mm, long, from Hast- 

 ings, Florida, June, 1901 ; 

 Brimley, collector. 



M easurements of a 

 large individual. — 

 Length of body 0.555 

 mm.; width of body 

 0.124 mm.; thickness of 

 body 0.025 mm. ; diam- 

 eter of nucleus 0.00425 

 mm. to 0.0051 mm., mean 

 0.0045 mm.; length of 

 endospherule 0.0015 

 mm.; width of endo- 

 spherule 0.001 mm. ; cilia line interval, anterior 0.0021 mm., middle 

 0.004 mm., posterior 0.004 mm. 



Opalina chorophili, United States National Museum No. 16571. 

 Host. — Chorophilus ornatus (Holbrook), two good infections, from 

 Texas. The specimens of the parasite deposited with the United 



Fig. 185. — Opalina chorophili, from Chorophilus 

 occidentalism x 117 diameters. 



