10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



Family BRACHYCOELIIDAE S. J. Johnston, 1912 



Genus BKACHYCOELIUM Dujardin, 1845 



This genus is laiown in North America by two species from the 

 vermilion-spotted newt, and one species from a North American 

 snake, which died in a London zoo. The following adds three more 

 species. 



BRACHYCOELIUM HOSPITALE Stafford, 1900 



This fluke was described by Stafford (1900) from Canadian sala- 

 manders. I refer to it some specimens taken from Roma sphenoce- 

 phala. Stafford's (1903) later description is for the most part ade- 

 quate, but my material shows a few variations that need to be men- 

 tioned. Stafford gives the ratio of the oral sucker to the acetabulum 

 as 4 : 3. In my material this ratio varies from 3 : 2 to 4 : 3. The eggs 

 in fully matured individuals fall very close to the dimensions given 

 by Stafford, but in young individuals they are very variable in size. 



BRACHYCOELIUM STORERIAE, new species 



Plate 1, Figukh 3 



Specific diagnosis. — Brachycoelium: Body length 1.19 mm, width 

 0.25 mm. The cuticula is thin, and very fine spines are imbedded in 

 it in the region of the oral sucker, but these disappear before the 

 middle of the body is reached. The oral sucker is subterminal and 

 measures 140;u, in diameter. The acetabulum measures 84)u, by 100/x. 

 The ratio of oral sucker to acetabulum, therefore, approximates 3 : 2. 

 The anterior margin of the acetabulum is 0.42 mm from the anterior 

 end. It, therefore, lies entirely caudal of the posterior limit of the 

 first third of the body. A very short prepharynx leads to the oval 

 pharynx, which measures 38/x by 46//,. The esophagus is rather long, 

 measuring about 0.126 mm. At its posterior end lie the two short, 

 divergent ceca, which just reach the acetabulum. The ovary lies on 

 the right side of the body at the level of the acetabulum. It is a 

 nearly spherical structure, TO/x in diameter. The rest of the ovarian 

 complex could not be made out with certainty, but it is believed that 

 the ootype and Mehlis's gland lie median and dorsal to the ovary. A 

 structure that appears to be a seminal receptacle lies median to the 

 cephalic margin of the ovary. The exact course of the uterus can not 

 be traced. The eggs lie in the posterior portions of the body, behind 

 the ovary but to some extent overlying the testes. Apparently the 

 uterus passes around the left side of the acetabulum to the median 

 genital pore. The genital pore lies just anterior to the acetabulum. 

 The vitellaria are extensively developed. They extend from a line, 

 the width of the pharynx behind that structure, to the level of the 

 testes. They are within the dorsal portions of the body and occupy 



