50 
Family SCHISTOSOMID^E. 
Genus SCHISTOSOMA^ Weinland, 1858. 
Generic diagnosis. — Schistosomidye (sexes separate): Male: Broad with ven- 
trally curved lateral margins, forming the canalis gynsecophoriis. Intestinal ceca 
unite some distance caudad of the acetabulum. Genital pore median, caudad of 
Fig. 85. — Anterior portion of male Human Blood 
Fluke {Schistosoma hscmatobium) , showing the ana- 
tomical characters: oc., acetabulum; pc., cerebral gan- 
glion; gl., glands of esophagus (es); i., intestine; nda., 
acetabulum. Copulatory organs ab- 
sent; genital glands confined to a 
small area at the anterior end of 
canalis gyna^cophorus; 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 hscma- 
tohium (Bilharz, 1852). 
'The Human Blood Fluke — SCHIS- 
TOSOMA H.®MATOBIUM& 
(Bilharz, 1852) Weinland, 1858. 
[Figs. 84 to 88.] 
Specific diagnosis. — Schistosoma. 
Male: Whitish, 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 liulbs. Female: Whitish to 
dark red brown, 15 to 20 mm. long. 
Suckers as iu male. Skin with 
minute spines. Intestine as in male, 
« Synonyms. — Schistosoma Wein- 
land, 1858; Gynsccophorus Diesing, 
dor.^al anterior nerve; oidp., dorsal posterior nerve; ig 5 g. Bilharzia Cobbold, 1859; The- 
nla., lateral anterior nerve; nva., ventral anterior ,, • rr\ t n 7 • 
■ 1 , . 7 17-1 cosoma 31oqum-landon, 1860; Schis- 
nerve; nvp., ventral posterior nerve; p>lv., lateral 1 ’ ’ 
posterior nerve; gp., genital pore; t., testicles; vs., tosomum B. Blanchard, 1895. 
vesicnla seminalis. (After Looss, 1895, pi. 2, fig. 18.) ^^Synonyms. — Distomum Juvmato- 
hium Bilharz, 1852; Schistosoma 
hcematohium (Bilharz) Weinland, 1858; Giimrcojihorus hxmatobius (Bilharz) Diesing, 
1858; Bilharzia hxmatohia (Bilharz) Cobbold, 1859; (?) Bilharzia magma Cobbold, 
1859; Thecosorna hccmalohium {BiVaarT.) Moquin-Tandon, 1860; Distoma capense Yi 2 LV- 
ley, 1864, nomen nudum; Bilharzia capensis Harley, 1864; Bilharzia hxmatohia 
hominis Kowalewski, 1895; (?) Bilharzia hrcmatohia magma (Cobbold) Kowalewski, 
1895; Schistosomurn hxmatohium (Bilharz) Blanchard, 1895. 
Bibliography. — For bibliography, see Huber (1894, pp. 294-305). For detailed 
anatondcal study, see Looss (1895, pp. 1-108) and Leuckart (1894, pp. 464-534). 
