182 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



ing coiled seminal vesicle and eversible cirrus, with approximately- 

 posterior half lying dorsally to anterior margin of acetabulum. Ovary 

 oval in shape, small, 0.07 to 0.12 mm. long by 0.11 to 0.17 mm. wide, 

 located immediately behind posterior testis, lateral in position, with 

 outer margin pressed close against either right or left cecum. Seminal 

 receptacle large, globular, located posteromedially to ovary. Vitel- 

 laria composed of 8 to 12 large oval follicles on each side of body, lo- 

 cated immediately posterior to ovary. Uterus convoluted filling 

 greater part of body posterior to ovary, then passing to either right or 

 left of posterior testis and ovary, dorsal to anterior testis, to describe 

 two or three lateral loops dorsal to acetabulum before ascending to 

 genital pore. Mature ova dark brown, 46;u, to 53/a long by 27/* to 

 32/A wide. 



Host. — Toxostoma rufum (Linnaeus). 



Habitat. — Liver. 



Locality. — Georgia : Athens. 



Tyve 57?ec^7?^€n.— U.S.N.M. Helm. Coll. No. 37122. Additional 

 specimens, Nos. 36755 and 36756. 



RemarTcs. — Brachylecithum exochocotyle is described from more than 

 75 specimens removed from the liver of a brown thrasher, Toxostoma 

 rufum., obtained at Athens, Ga. This infection, the only one (2.44 

 percent) encountered in 41 brown thrashers examined from various 

 localities, occurred as a double infection with Lyperosomumj oswaldoi. 

 The bird, which was found in a dying condition with its liver almost 

 completely destroyed, was the only host examined that showed definite 

 evidence of being harmed by its dicrocoeliid infections. 



Brachylecithum exochocotyle can be separated from B. stunkardi., 

 which it resembles very closely, by its shorter and wider body, its rela- 

 tively smaller oral sucker, its large oval testes, its relatively smaller 

 ovary, and especially in the difference in size and appearance of the 

 vitelline follicles. 



Genus ATHESMIA Looss, 1899 



ATHESMIA HETEROLECITHODES (Braan, 1899) 



Figure 36, f 



Distomum Jieterolecithodes Beaun, Zool. Anz., vol. 22, p. 3, 1899. 



Athesmia reelfooti Denton, in Petri, Trans. Amer. Micr. Soc, vol. 61, p. 60, 1942. 



A single mature specimen belonging to the genus Athesmia was dis- 

 sected from the liver of a Florida gallinule, Gallinula chloro'pus 

 cachinnans Bangs, collected at Keelfoot Lake, Tenn. It is possible to 

 assign this material to A. heterolecithodes (Braun, 1899), although 

 our specimen differs somewhat from this species as redescribed by 

 Jacoby (1899a, b) in having a narrower and longer body, relatively 

 shorter ceca, more posterior genital pore, and a smaller cirrus pouch. 



