AKT. 17 PARASITES OF AMPHIBIA AND EEPTILIA HAEWOOD 17 



The esophagus in properly expanded specimens is somewhat longer 

 than the pharynx. The wide ceca extend to the posterior end of 

 the body. The ovary lies beside the acetabulum and is irregularly 

 lobed. It is 0.65 to 0.83 mm in length and 0.32 to 0.45 mm in width. 

 The vitellarian follicles are arranged in 19 to 24 groups of irregular 

 size and shape. It is difficult to count the individual follicles in each 

 group, but they seem to range from 1 to 2 dozens. The uterus is 

 arranged much like that of Haematoloech<iis 'parviplexus Irwin. 

 There are a few loops at the anterior end of the ovary, then the 

 uterus turns caudad, passes between the testes, and after a series 

 of loops in the posterior end of the body there are the usual longi- 

 tudinal folds outside the intestinal ceca, and then the uterus follows 

 the same route cephalad to the genital pore in the pharyngeal region. 

 There is a little difference in the lengths of the longitudinal folds 

 in my material. They may extend only to the cephalic border of 

 the posterior testis or to the cephalic border of the anterior testis. 

 Not infrequently the uterine fold on the ovarian side of the body is 

 somewhat shorter than its mate. The eggs vary from 21/x by IT/x to 

 17/Li by 13ju. The testes are oval elongate bodies, somewhat irregu- 

 lar in outline. Not infrequently they are pointed at the anterior 

 end. The two overlap for half their length. The posterior testis 

 is usually slightly larger. It measures 0.8 to 1.2 mm in length and 

 0.34 to 0.7 mm in width. The anterior testis is 0.7 to 1.1 mm in 

 leno-th, and 0.32 to 0.65 mm in width. The size of the testes shows 

 but very little correlation with the size of the worm. The distance 

 of the posterior testis from the posterior end varies too much to be 

 of any use as a character. The seminal vesicle is a large oval sac 

 lying beside the ovary. The genital field is approximately two-fifths 

 of the length of the body, but here again the variation is so great 

 that the character must be of very doubtful use. In a worm 5.5 

 mm long the genital ^eld measured but 1.8 mm, while in a worm 

 5.25 mm long the genital field measures 2.2 mm. 



Hosts. — Rana catesbeiana and B. clmiiitans. 



Habitat, — Lung. 



Locality. — Houston, Tex. 



Ty^e s/?^m^im.— U.S.N.M. Helm. Coll. No. 30879. 



Remarks. — This species most closely resembles Hacmatoloeclius 

 farvipleodus Irwin, but it may be distinguished from that form by 

 the smaller pharynx, the larger acetabulum, the smooth cuticula, 

 the smaller ^g^g., and the longer longitudinal folds of the uterus. 

 H. hrevipleams also has a smooth cuticula, but in this species it is 

 exceptionally thick, whereas in H. foedae it is very thin. The 

 present species also differs from H. hreviplexus in size, relatively 

 smaller acetabulum, and the unlobed testes. 

 126821— .32 2 



