186 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



from the vicinity of Athens, Ga. The specific designation is selected 

 because of the medial position of the testes. 



Description. — Body moderately large, elongated elliptical in out- 

 line, somewhat cylindrical in transsection ; 1.3 mm to 2.7 mm long, 

 averaging 1.7 mm; 0.42 mm to 0.69 mm wide, averaging 0.54 mm; 

 widest at level of acetabulum. Cuticle relatively thin throughout, 

 armed with moderately fine spines anteriorly to level of testes. Oral 

 sucker subterminal, 0.165 mm i^ diameter. Acetabulum 0.116 mm 

 in diameter, located about one-fourth body length, or 0.45 mm, from 

 anterior end of body. Ratio of sizes of oral sucker and acetabulum, 

 approximately 7 : 5. Prepharynx present, about 50/* long. Pharynx 

 muscular, 0.04 mm long by 0.07 mm wide, surrounded by numerous 

 rather small peripharyngeal gland cells. Caeca fairly large, 0.21 

 mm long, 0.09 mm in maximum width, lined internally by a mem- 

 brane of tall epithelial cells, ending short of level of anterior margin 

 of acetabulum. Ovary alternating from right to left side of mid- 

 line, always partially dorsal to acetabulum, at level of equatorial 

 plane of acetabulum or slightly in advance of that position, with 

 margin entire, transversely oval, 0.096 mm long by 0.14 mm wide. 

 Oviduct slender, sinuous, arising from medial end of ovary. Ootype 

 at about posterior margin of ovarian side of acetabulum, lined in- 

 ternally by a ciliated membrane. Laurer's canal present. Seminal 

 receptacle flask-shaped. Shell gland rather voluminous, entirely sur- 

 rounding ootype. Uterus greatly convoluted, descending limb form- 

 ing half loops on ovarian side, reaching to near posterior margin 

 of body; ascending limb forming half loops in posterior body op- 

 posite descending limb, but forming complete loops across body just 

 posterior to testes before passing between testes to make other com- 

 plete transverse loops in front of testes, then passing to genital pore. 

 Metraterm weakly developed. Ova numerous, thick-shelled, oper- 

 culated, containing fully matured embryos when oviposited, measur- 

 ing 27/Lt to 33/i by 45/i. to 52ju,. Vitellaria composed of rather large 

 follicles, tending to form two or three clusters on each side of body, 

 lateral in position, extending from level of posterior margin of ace- 

 tabulum to level of bifurcation of caeca, overlying caeca to near 

 bifurcation. Yolk ducts single on each side, uniting immediately 

 posterior to shell gland and forming a small crescent-shaped yolk 

 reservoir. Genital pore ventral, in midline just in front of ace- 

 tabulum. Testes transversely oval, margins entire, with inner mar- 

 gins touching or overlapping midline, one slightly in advance of 

 other, depending on position of ovary (right testis posterior in posi- 

 tion when ovary is on right side), situated in area just posterior to 

 acetabulum; right testis 0.112 mm long by 0.143 mm wide; left testis 

 0.104 mm long by 0.153 mm wide. Vasa eflferentia delicate, uniting 



