ART. 17 PARASITES OF AMPHIBIA AND EEPTILIA HARWOOD 15 



from the middle of the pharynx to the level of the intestinal fork. 

 The ovary lies above the right margin of the acetabulum. It is a 

 globular structure 0.3 to 0.6 mm in diameter. It is followed closely 

 by a small ootype and Mehlis's gland. Lateral to the caudal margin 

 of these structures lies a seminal receptaculum about half the size of 

 the ovary. Laurer's canal leaves the female genital system at the 

 point where it is joined by the transverse vitelline ducts and, after a 

 short cephalic course, turns abruptly dorsad to open above the 

 acetabulum. The vitellaria occupy two lateral fields from slightly 

 caudal to the intestinal fork to a point the length of the testes caudal 

 to those structures. Posterior to the acetabulum they extend mesad 

 to the inner margin of the ceca, but anterior to it they extend entirely 

 across the worm. The uterus passes posteriorly in transverse loops, 

 ventral to the testes, and between the intestinal ceca. Caudal to the 

 ceca they spread out the entire width of the body. The ascending 

 loops follow the same course to the level of the ovary, where the 

 uierus passes to the left of the acetabulum and terminates in a 

 metraterm 50/x long. The eggs vary from 33ft by 17/* to 46/* by 25ix. 

 The testes are symmetrically placed and a little more than their 

 diameter behind the ovary. They are globular or oval structures 

 and measure 0.3 by 0.5 mm or more. The vas efferens of the right 

 side passes cephalad, ventral to the seminal receptaculum and 

 ootype, but bends sharply mesad behind the ovary. It meets its 

 fellow and enters the cirrus sac. The vas efferens of the opposite 

 side follows much the same course. The cirrus sac, which contains 

 a seminal vesicle, is an elongate structure curving from the genital 

 pore to the right of the acetabulum and terminating at the caudal 

 border of the ovary. The genital pore is located about halfway be- 

 tween the acetabulum and the intestinal fork. The excretory pore 

 lies at the extreme caudal tip of the body. The vesicle extends for- 

 ward and forks at the posterior margin of the testes, and the two 

 arms extend forward to the level of the genital pore. The anterior 

 arms are relatively small. 



Hosts. — Bana cafesheiana, R. sphenocephala. 



Habitat. — Intestine. 



Localities. — Houston and Huntsville, Tex. 



Type spmmew.— U.S.N.M. Helm. Coll. No. 30878. 



Remarks. — This distome most closely resembles Glypthelmins 

 quieta., but it may readily be distinguished from this form by the 

 transverse band of vitellaria, the location of the testes behind the 

 transverse vitelline duct, and the tendency of the uterus to pass ven- 

 tral to the testes rather than between them. 



