18 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 73 



The pharynx is pyriform, a little longer than broad, and con- 

 tiguous to the oral sucker. The esophagus extends to the anterior 

 border of the ventral sucker; rami of intestine reach to the posterior 

 end of the body; genital pore at the anterior border of the ventral 

 sucker, a little to the left of the median line. The cirrus appears 

 to be smooth; cirrus-pouch slender, on the dorsal side of the left 

 border of the ventral sucker, about 0.5 in length, not including its 

 continuation into the seminal vesicle, which is about 0.17 mm. in 

 length. Testes two, near together on the median line, and near the 

 posterior end of the body; second testis 0.6 mm. from the posterior 

 end. Ovary oval, with the longer diameter transverse, in front of 

 testes, most of it to the right of the median line. The ovary is 

 separated from the first testis by a short space in which lie the shell- 

 gland, seminal receptacle, vitelline ducts, and the beginning of the 

 uterus. In front of the testes, for a distance of about 8.5 mm. the 

 folds of the uterus, crowded with ova, fill the body between the 

 marginal vitellaria. For a considerable distance behind the ventral 

 sucker the uterus is somewhat tortuous in its course to the genital 

 pore. Near the ventral sucker it lies dorsal and median to the cirrus- 

 pouch. The vitellaria are lateral and lie in a narrow line along each 

 lateral margin from a point near the middle of the length to a short 

 distance in front of the ovary. 



A distinctive feature of the stained and mounted specimen is the 

 occurrence of strong longitudinal muscle bundles from the level of 

 the ventral sucker to the posterior end. Behind the testes about 24 

 of these bundles could be seen. The peculiar papillate spines are 

 also a conspicuous character. The filament, attached to an ovum, 

 is very long. The example illustrated (fig. 49) was lying isolated 

 from other ova in the metraterm, and the filament was traced with 

 the aid of a camera lucida. 



Type.—C2it No. 7934, U.S.N.M. 



STEPHANOCHASMUS species 



On August 15, 1913, a kingfisher {Oeryle alcyon) was examined 

 at Woods Hole. The only parasite found was an encysted distome 

 in the stomach. The stomach of the bird was filled with small fish 

 {Menidia notata). 



Since the worm was still enclosed in its cyst, and associated with 

 recently ingested food, with which it was probably introduced, it 

 will be best not to regard the kingfisher as a final host of this 

 parasite. 



Diameter of cyst in sea water 1.12 mm. Dimensions in balsam, 

 specimen compressed: Diameter of cyst 1.16; length of distome 1.96; 

 diameter, lateral view, anterior 0.14, at pharynx 0.21, at ventral 



