ART. 18 THE TEEMATODE FAMILY SCHISTOSOMIDAE PRICE 



3. Intestinal ceca of male unite near junction of anterior and middle thirds of 



body; testes eight to nine in number; ovary in anterior half of body; egg 

 120/u to 160m long by 60ai to 70/i wide, with well-developed lateral spine. 



S. mansoni, p. 6. 

 Intestinal ceca of male unite near equator of body ; testes four to five in 

 number ; ovary near junction of posterior and middle thirds of body ; egg 

 120m to IGOytt long by 40/i to GOm wide, with terminal spine. 



S. haematobium, p. 5. 



4. Testes three to six in number ; ovary in posterior half of body ; egg spindle- 



shaped, symmetrical, IGO/n to 180^ long by 50/x to 80fi wide, with tenninal 



spine S. bovis, p. 8. 



Testes usually more than six in number ; ovary near equator of body 5. 



5. Egg oval, 92At to 120^ long by 42^ to 72/x wide, with terminal spine. 



S. indicum, p. 11. 



Egg spindle-shaped, asymmetrical, 248/i to 400^ long by 52^ to 72^ wide, with 



terminal spine S. spindalis, p. 9. 



SCHISTOSOMA HAEMATOBIUM (Bilharz, 1852) V/einland, 1858 



Figux'es 1 — 4 b 



Siinonynhs. — Distoma haematohimn Bilharz, 1852. pp. 72-76 (in 

 Homo, Egypt) ; Gynaeco phoi^us haenuitohius (Bilharz. 1852) Die- 

 sing, 1858. pp. 356-357; Bilharzia haematoMa (Bilharz. 1852) Cob- 

 bold, 1859, p. 364; Bilharzia magna Cobbold, 1859, p. 364; Thecosoma 

 haematohium (Bilharz, 1852) Moquin-Tandon, 1860, p. 342; Bilharzia 

 capensis Harley, 1864, p. 63; Gynaecophoi'us magnus (Cobbold, 1859) 

 Stossich. 1892, p. 6; Bilharzia haeinatohia hominis Kowalewski, 1895, 

 p. 26; Bilharzia haeinatohia magna (Cobbold, 1859) Kowalewski, 

 1895, p. 27. 



Specific diagnosis. — Schistosmna: 



Male 4 to 15 mm. long by about 1 mm. wide. Anterior part of 

 body short, subcylindrical ; posterior part long, flattened, and with 

 lateral edges infolded ventrally, forming the gynaecophoric canal. 

 Cuticle tubercuiate and spiny. Oral sucker subtermiiial, elongated 

 anteroposteriorly, and lined with fine spines; acetabulum circular, 

 pedunculated, spiny, and situated a short distance caudad of oral 

 sucker. Esophagus short and surrounded by esophageal glands; 

 immediately in front of acetabulum the esophagus bifurcates to 

 form the paired intestinal ceca, the two branches extending caudad 

 to about the equator of the body, where they unite to form a common 

 cecum, which terminates near the posterior end of the body. Testes 

 4 to 5 in number, situated dorsally near the beginning of the 

 gynaecophoric canal. Seminal vesicle spherical, situated in front 

 of the anterior testis. The genital pore opens in the median line 

 at the beginning of the g_vnaecophoric canal. 



Female about 20 mm. long, filiform, and with a maximum width 

 of 250|W. Cuticle without spines, except in suckers and at posterior 

 end of body. Digestive tract similar to that of male. Ovary elon- 



