40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



the same as that described by Jagerskiold for Monosto^num lacteuvi; 

 on the basis of this similarity he transferred M. cochlearifornie to the 

 genus Galactosomum^ making the two genera synonymous. Travas- 

 sos (1929) apparently recognizes this arrangement, but Witenberg 

 (1929) regards the two genera as distinct "because of differences in 

 the arrangement of the genital glands." The writer (Price, 1931) 

 has shown that the arrangement of the genital glands is subject to 

 considerable variation within a genus and is a character of no ge- 

 neric importance in the Heterophyidae. 



In the same paper, Witenberg proposed a new genus, Gercaur- 

 ioides^ as the basis for a new subfamily, Cercarioidinae, the type 

 species, G. aharonii, being characterized by having a dilated anterior 

 part of the body set off by a slight constriction from the more 

 cylindrical posterior part. To this new genus, Nazmi (1930) added 

 an additional species, G. l)aylisi. A comparison of the descriptions 

 shows no essential differences between these species and those belong- 

 ing to the genus Oalactosomum. The anterior widening of the 

 body in G . aharonii and in G. haylisi is onlj^ slightly more pronounced 

 than that in G. cochlearifoi-ine; the arrangement of the genital 

 glands, the course of the uterus, and the terminal portions of the 

 genital ducts also appear to be similar. Therefore, the writer 

 regards Gercarioides Witenberg as a synonym of Galactosoiii'wn 

 Looss, the two species G. aharonii Witenberg and G . haylisi Nazmi 

 becoming G. aharonii (Witenberg) and G. haylisi (Nazmi), re- 

 spectively. 



GALACTOSOMUM ERINACEUM (Poirier, 1886) Bittner and Sprehn, 1928 



Plate 9, Figure 39 



/Synonyms. — Distonvwm erinacevmi Poirier, 1886, pp. 37-38; Astio- 

 trema erinacea (Poirier, 1886) Stossich, 1904, p. 2. 



Description. — Galactosonvmn : Body elongated, 3 mm long by 800/a 

 wide, the anterior half of the body being wider than the posterior 

 half. Cuticle beset with spines, which become less numerous toward 

 the posterior end of body. Oral sucker 300/a in diameter. Excretory 

 vesicle tubelike, curving between the testes, and extending anteriorly 

 to the vicinity of the ovary. Pharynx small, ITjH long, the width 

 being almost equal to the length, and situated about 10/x from the 

 oral sucker. Esophagus short and narrow; intestinal ceca simple 

 and extending to the posterior end of the body. Genital pore 100/* to 

 800ju, caudad of the oral sucker ; seminal vesicle long, slender, and with 

 muscular walls. Testes globular, 300/t in diameter, situated diago- 

 nally in the posterior third of the body. Ovary globular, 150/a in 

 diameter, situated near the equator of the body ; receptaculum seminis 



