2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



passes under the A^entral surfaces of the ovary and seminal receptacle. 

 The seminal receptacle is just posterior to the ovary and nearly 

 median. The vitellaria are lateral, occur in unorganized chains of 

 follicles, and extend from about the level of the acetabulum poster- 

 iorly to a point about halfway between the posterior testis and the 

 posterior end of the body. 



Tijye species. — Haplornetrana intestinalis, new species. 



HAPLOMETRANA INTESTINALIS, new species 



Description. — Hap-loinetrana: Rather small, slender distomes, of 

 somewhat variable length and width. Mature specimens are about 

 5 mm. long and 0.48 mm. to 0.63 mm. in maximum width; thus, the 

 length is about eight to ten times the maximum widih. There is 

 no constriction between the anterior and posterior portions of the 

 body (pi. 1, fig. 1). The cuticle is spinous, especially in the 

 anterior region. 



The oral sucker is about 0.256 mm. to 0.32 mm. in diameter; it 

 is larger than the acetabulum and subterminal in position. The 

 acetabulum is about 0.176 mm. to 0.24 mm. in diameter and is sit- 

 uated in the anterior sixth of the body length. The suctorial disk 

 of the acetabulum is continued dorsally as a cone-shaped mass of 

 muscular tissue. 



The muscular pharynx is preceded by a short prepharynx. The 

 former is 0.11 mm. to 0.14 mm. wide and 0.08 mm. to 0.10 mm. long, 

 is nearly contiguous to the oral sucker, and is roughly one-half its 

 size. The esophagus is long and very slender. The intestinal ceca 

 are lateral in position, extending posteriorly from the bifurcation 

 to a point within a short distance from the posterior tip of the 

 body. In some specimens the ceca are of unequal length. 



Since it was impossible to study the specimens in the living state, 

 the precise structure of the excretory system can not be described. 

 One stained specimen shows paired saclike bladders extending an- 

 teriorly beyond the intestinal bifurcation, similar to those described 

 by Looss for Haplometva cylrndrica. These branches of the Y reach 

 nearly to the oral sucker. The excretory pore is terminal. 



The genital pore is anterior to the acetabulum and median, or 

 nearly median, in position. The cirrus pouch is slender and curls 

 about the suctorial disk of the acetabulum. (PL 1, fig. 2.) It is found 

 either to the left or to the right of the disk. The testes are tandem 

 and median; they occupy all, or nearly all, the intercecal space and 

 in some specimens are partially superimposed upon the ceca laterally. 

 Usually the testes are separated from each other by a distance some- 

 what less than their diameter. The posterior margin of the pos- 

 terior testis marks the approximate equator of the body. The diam- 

 eter of the testes is about 0.32 mm. to 0.368 mm. In the specimens 



