No. 2322. TREMATODE FAMILY HETEROPHYIDAE— RANSOM. 531 



border of the ovary ; chitinous rodlets of genital 

 sucker 70 to SO in number; eggs about 30 fi 



long , (heterophyes group) — 3. 



Length usually less than 0.9 mm. may reach 1 

 mm. ; vitellaria with 10 to 12 lobules in each 

 lateral field extend only as far forward as the 

 level of the posterior border of the ovary ; 

 chitinous rodlets of genital sucker 25 to 75 in 

 number; eggs about 20 m long (fraternus group) 4. 



3. Length 1 to 1.7 mm. ; eggs light brown ; in man, 



dog, cat, and (?) fox Heterophyes heterophyes. 



Length 0.75 to 0.95 mm.; eggs bright yellow; in 

 Milvus aegyptius Heterophyes pallidus. 



4. Cuticular scales relatively long and narrow, very 



close together; chitinous rodlets of the genital 

 sucker 65 to 75 in number ; in Pelecanus onocro- 



talus Heterophyes fraternus. 



Cuticular scales relatively broad and coarse with 

 rather wide intervals between them ; chitinous 

 rodlets of the genital sucker 25 to 35 in number 5. 



5. Oral, ventral, and genital suckers not greatly dif- 



ferent in size; intestinal ceca do not extend 



beyond the posterior borders of the testes 6. 



Ventral sucker much larger than the others, 2 to 3 

 times the diameter of the oral sucker ; intesti- 

 nal ceca reach posterior borders of testes, some- 

 times reaching excretory vesicle ; eggs a deep 

 dark brown in color ; in dog and cat Heterophyes dispar. 



6. Maximum length 0.46 mm. ; free edges of cuticular 



scales ending in a number of very fine points ; 

 ventral sucker about 56 /i in diameter ;^ color of 

 eggs never darker than a light yellowish-brown ; 



in Pelecanus and Milvus Heterophyes inops. 



Maximum length 0.5 to 0.9 mm. ; ventral sucker 

 70 to 90 M in diameter; color of eggs a bright 

 brown; in cat and dog Heterophyes aegualis. 



HETEROPHYES HETEROPHYES (Siebold, 1852) Stiles and Hassall. 1900. 



Figs. 1, 2. 



■ 1852. Distoma heterophyes Siebold 1852/^, pp. 62-64, pi. 5, figs. 16-17 (in 



Homo; Egypt). 

 18.55. Distoma heterophyes hominis Diesing, 1855c, p. 64. 

 1858. Dicrocoelium heterophyes (Siebold, 1852) Weinland, 1858a, p. 86. 

 1860. Fasciola heterophyes (Siebold, 1852) Moquin-Tandon, 1860or, p. 347. 

 1866. Heterophyes aeyyptiaca Cobbold, I8660, p. 6 (type of Heterophyes; 



Distoma heterophyes renamed). 

 1890. Mesogonimus heterophyes (Siebold, 1852) Railliet, 1890w, p. 143. 

 1899. Coenogonimnus heterophyes (Siebold, 1852) Looss, 1899b, pp. 585, 586, 



619 (type of Coenogonim-us). 



1899. Cotylogonimus heterophyes (Siebold, 1852) Luhe, 1899fc, p. 539 (type 



of Cotylogonimus) . 



1900. Heterophyes heterophyes (Siebold, 1852) Stiles and Hassall, 1900a, 



p. 563. 



