50 
Family SCHISTOSOiSIlD.E. 
Genus SCHISTOSOMA^ Weinland, 18S8. 
Genekic diagnosis. — Schistosomidpe (sexes separate): Male: Broad with ven- 
trally curved lateral margins, forming the canalis gymecophorns. Intestinal ceca 
unite some distance caudad of the acetabulum. Genital pore median, caudad of 
acetabulum. Copulatory organs ab- 
sent; genital glands confined to a 
small area at the anterior end of 
canalis gymecophorns; testicles com- 
posed of about five divisions; vesic- 
ula seminalis small, pars prostatica 
not evident. Female: Filiform. 
Uterus very long; may contain 
numerous eggs, with terminal or 
subterminal spine. 
Habitat. — Veins of mammals. 
Type species. — Schistosoma lisema- 
tohium (Bilharz, 1852). 
The Human Blood Fluke — SCHIS- 
TOSOMA HiEMATOBIUM& 
(Bilharz, 1852) Weinland, 1858. 
[Figs. 84 to 88.] 
Specific diagnosis. — Schistosoma. 
Male: AVhitish, 4 to 15 mm. long, 1 
mm. broad; anterior portion of 
body 0.6 mm. long. Oral sucker 
about same size as acetabulum, 
which is anterior, immediately 
caudad of bifurcation of intestine. 
Skin with numerous small warts. 
Esophagus short; intestinal ceca 
reunite caudad of testicles; caudal! y 
of acetabulum, 4 to 6 glandular tes- 
ticular bulbs. Female: "Whitish to 
dark red brown, 15 to 20 mm. long. 
Suckers as in male. Skin with 
Fi(i. 85. — -\nterior portion of male Human Blood minute spines. Intestine as in male. 
Fluke (Schistosoma haematobium) , showing the ana- 
tomical characters: ac., acetabulum; gc., cerebral gan- 
glion; gl., glands of esophagus (es): i., intestine; nda., 
dorsal anterior nerve; ndj)., dorsal posterior nerve: 
nla., lateral anterior nerve; nva., ventral anterior 
nerve; nvp., ventral posterior nerve; ph’., lateral 
posterior nerve; gp., genital pore; t.. testicles; rs., 
vesicula seminalis. (After Looss, 1895, pi. 2, fig. 18.) 
« Synonyms. — Schistosoma Wein- 
land, 1858; Gynxcophorus Diesing, 
1858; Bilharzia Cobbold, 1859; TI:e- 
cosoma Moquin-Tandon, 1860; Schis- 
tosomurn K. Blanchard, 1895. 
^Synonyms. — Distomum hxmato- 
hiam Bilharz, 1852; Schistosoma 
hxmatohium (Bilharz) "Weinland, 1858; Gyniecophorus hxmatohius (Bilharz) Diesing, 
1858; Bilharzia hccmatohia (Bilharz) Cobbold, 1859; (?) Bilharzia magna Cobbold, 
1859; Thecosoma hxmatohium (Bilharz) Hoquin-Tandon, 1860; F>istoma capense YLscr- 
ley, 1864, nomen nudum; Bilharzia capensis Harley, 1864; Bilharzia hxmatobia 
hominis Kowalewski, 1895; (?) Bilharzia hxmatobia magna (Cobbold) Kowalewski, 
1895; Schistosomurn hxrnatobium (Bilharz) Blanchard, 1895. 
Bibliogkaphy. — For bibliography, see Huber (1894, jip. 29-1—305). For detailed 
anatomical study, see Looss (1895, pp. 1-108) and Leuckart (1894, pp. 464-534). 
