ART. 18 THE TREMATODE FAMILY SCHISTOSOMIDAE PRICE 15 



acetabulum ; seminal vesicle oval and lying entirely within the cirrus 

 pouch. Genital pore 570/a caudad of acetabulum and to the left of 

 median line. Excretory system consists of a short bladder which 

 opens at excretory pore at the tip of the body, and of two slender 

 branches extending cephalad on each side of body. 



Female unlcnown. 



Cercaria unknown or unrecognized. 



Hosts. — Primary, mammals {Lynx species, probably L. uinta) ; 

 secondary, unknown. 



Location. — Mesenteric veins. 



Distribution. — North America (United States (Washington, D. C, 

 National Zoological Park) ). 



Type specimens. — United States National Museum Helminthoktgi- 

 cal Collections No. 14532, collected August 27, 1907, by Dr. M. C. 

 Hall and Dr. A. Hassall. 



PARASCHISTOSOMATIUM, new genus 



Generic diagnosis. — Schistosominae : Male unknown. Female 

 slender, flattened, and tapering toward the extremities. Cuticle 

 smooth. Oral sucker subterminal, well developed; acetabulum 

 pedunculated. Esophagus simple; intestinal ceca without lateral 

 diverticula and united caudally near posterior end of body ; common 

 cecum very short. Ovary spirally curved, in posterior third of 

 body; uterus long and filled with eggs. Vitelline follicles few in 

 number, situated posterior to ovary and between the cecal branches. 



Type species. — Paraschistosomatiuni anhingae., new species. 



PARASCHISTOSOMATIUM ANHINGAE. new species 

 Figure .35 



Specific diagnosis. — ParasoMstosomatimrh: 



Male unknown. 



Female 6.9 mm. long by 325/a wide. Body flattened and tapering 

 gradually toward the extremities. Cuticle smooth and without spines 

 except in suckers. Suckers equal in size, 143/a in diameter; oral 

 sucker subterminal; acetabulum pedunculated and situated 480/^ 

 caudad of oral sucker. Esophagus simple, bifurcating in front of 

 acetabulum ; intestinal ceca unite caudally about 460)u, from posterior 

 end of body ; common cecum 200ju, long. Ovary spiral, 585;a long as 

 measured in a straight line and exclusive of length of spiral, and 

 situated in the anterior part of the posterior third of body. Vitel- 

 laria consist of a few scattered follicles lying posterior to the ovary 

 and between the cecal branches. Genital pore is situated imme- 

 diately caudad of the acetabulum. Uterus long and filled with thin- 

 shelled eggs which measure about 70/a long by 43/a wide. 



