188 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



in greatest width, lined internally by rather tall epithelial cells, end- 

 ing well in front of acetabulum. Ovary transversely oval, lateral 

 in position, alternating from right to left side of body and varying 

 from a position on level with equatorial plane of acetabulum to a 

 position slightly in front of acetabulum, measuring 0.096 mm long 

 by 0.140 mm wide. Oviduct delicate, arising from medial end of 

 ovary and extending posteromesad for a distance greater than 

 transverse diameter of ovary before forming ootype. Ovarian 

 complex typically that of B. mesorchium. Uterus a simple 

 tube descending to near posterior margin of body before return- 

 ing to genital pore. The entire pattern of the uterus has not been 

 made out because of the numerous dark-brown ova contained in it. 

 Distal end of uterus forming weakly developed metraterm. Ova 

 27/t to 33/x by 42;a to 45/t, dark brown in color, thick-shelled, opercu- 

 lated, containing fully developed embryos when oviposited. Vitel- 

 laria follicular, occuf)ying a position just under dorsal and ventral 

 surfaces of body, lateral to caeca, seldom overlapping caeca except 

 marginally, extending from level of caudal end of caeca to level of 

 equatorial plane of oral sucker. Yolk ducts single in each lateral 

 field, uniting at level of shell gland and forming yolk reservoir. 

 Genital pore ventral, in midline just in front of acetabulum. Testes 

 elongated oval, with margins entire, in lateral fields opposite acetab- 

 ulum, depending on position of ovary for exact location (when 

 ovary is on right side, right testis is more posterior in position) ; 

 right testis 0.223 mm long by 0.164 mm wide; left testis 0.241 mm 

 long by 0.166 mm wide. Vasa efferentia uniting on entering cirrus 

 sac. Cirrus sac club-shaped, usually entirely anterior to acetabulum, 

 sometimes extending posteriad around or over acetabulum as far as 

 its posterior margin, containing an almost spherical vesicula semi- 

 nalis, a short, bulbous pars prostatica surrounded by gland cells, a 

 short ductus ejaculatorius, and a weakly developed cirrus. Excretory 

 system identical with that observed for B. mesorchium except an- 

 terior end of bladder always observed to end in short, bluntly 

 rounded cornua. 



Host. — Rana sphenocephala Cope. 



Habitat. — Small intestine. 



Locality. — Athens, Ga. 



Type specimen. — ^U.S.N.M. Helm. Coll. no. 9030. 



Remarks. — Brachycoelium georgianiu?n probably shows a closer 

 relationship to B. mesorchium than to any of the other members of 

 the genus. It can be distinguished from that species, as well as from 

 B. hospitale, B. ohesum, B. trituri, and B. lynchi, the other members 

 of the genus with which it might be confused, by the extent and 

 configuration of the vitellaria, the position of the ovary, the size. 



