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TREMATODE GENUS BRACHYCOELIUM — BYRD 187 



on entering cirrus sac. Cirrus sac thin-walled, usually anterior to 

 acetabulum, but sometimes extending posteriad over or around ace- 

 tabulum to end short of posterior margin of sucker, containing an 

 almost spherical vesicula seminalis, a club-shaped, muscular pars 

 prostatica surrounded by gland cells, a short ductus ejaculatorius, 

 and a weakly developed cirrus. Excretory system (pi. 8, fig. 3) 

 characteristic. Bladder opening through a dorsoterminal pore 

 guarded by a sphincter muscle ; main stem of bladder Y-shaped, with 

 short, often indistinct cornua, passing anteriad just under dorsal 

 surface of body, ending near anterior margin of anterior testis. 

 Common collecting tubules relatively long, sinuous, dividing into 

 anterior and posterior collecting tubules and these giving rise to 

 accessory tubules. Flame cells in groups, six groups in each side, 

 each group containing three flame cells. Flame cell pattern of 

 2X6X3 type. 



Host. — Desmognathus fuscus fuscus (Rafinesque). 



Hahitat. — Small intestine. 



Locality, — Athens, Ga. 



Type specimen.— U.^.'^M. Helm. Coll. no. 9031. 



Kemarks. — Brachycoelium mesorchium shows a close relationship 

 to B. hospitale but may be distinguished from that species, as well 

 as from B. ohesum, B. trituri., and B. lynchi., the other members of 

 the genus with which it may be confused, by its more nearly equal 

 suckers, the more medial position of the ovary and testes, the con- 

 figuration and distribution of the vitellaria, and the pattern made 

 by the uterus. 



BRACHYCOELIUM GEORGIANIUM, new species 



Plate 8, Figure 4 



Eight specimens of this species of worm were taken from the 

 small intestine of the grass frog {Rana sphenocephala) collected 

 from the region about Athens, Ga. 



Description. — Body spindle-shaped, bluntly pointed at both ends, 

 or elongated oval with strongly rounded ends; averaging 1.326 mm 

 long by 0.80 mm wide ; widest at level of body equator. Cuticle rela- 

 tively thin, thicker ventrally than dorsally; armed with spines to 

 near posterior margin of body. Oral sucker subterminal, muscular, 

 slightly elongated oval, 0.206 mm long by 0.191 mm wide. Acetab- 

 ulum transversely oval, measuring only one-half as much as oral 

 sucker, about one-third body length, or 0.474 mm, from anterior body 

 margin. Ratio of sizes of oral sucker and acetabulum, 2 : 1. Pre- 

 pharynx short, about 20/^ long. Pharynx muscular, transversely 

 oval, 0.055 mm long by 0.087 mm wide, surrounded by gland cells. 

 Esophagus slightly longer than transverse diameter of pharynx, sur- 

 rounded by gland cells. Caeca saclike, 0.175 mm long by 0.091 mm 



