4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



median branches. Excretory vesicle long and slender, with numer- 

 ous lateral branches, which anastomose to form an extensive dorsal 

 and ventral network. Genital pore preacetabular, situated at base 

 of cephalic cone; cirrus pouch not extending caudally beyond pos- 

 terior margin of acetabulum; testes profusely branched, tandem in 

 position, and situated in the equatorial zone. Ovary branched, pre- 

 testicular, situated to one side of median line ; seminal receptacle ab- 

 sent; Laurer's canal present. Vitellaria very profusely developed, 

 extending from base of cephalic cone to posterior end of body, com- 

 pletely filling posttesticular area, and extending both dorsal and ven- 

 tral to intestinal ceca. Uterus coiled in the form of a rosette, sit- 

 uated between acetabulum and ovary. Eggs large, without thicken- 

 ing of posterior pole, circular in cross section. Parasitic in bile ducts 

 o,f herbivorous and omnivorous mammals. 



Type species. — Fasciola hepatica Linnaeus, 1758. 



FASCIOLA HEPATICA Linnaeus, 1758 



Plate 1, Figure 1 



Synonyms. — Planario) latiuscula Goeze, 1782, p. 169; Distonia he- 

 paticutn (Linnaeus, 1758) Abildgaard (?) ; Fasciola humana Omoiin., 

 1790, p. 3053; Fasciolaria hepntica Encycl. Metropolitana, 1845, p. 

 141; Distomum caviae Sonsino, 1890, p. 100; Gladocoelium hepaticuTn 

 (Linnaeus, 1758) Stossich, 1892, p. 7. 



Description. — Fasciola: Body flat and leaf like, 13 mm long by 3.7 

 mm wide in region of ovary ; cephalic cone 1 mm long. No cuticular 

 spines were present on the specimen examined by the writer. Oral 

 sucker subterminal, 387/^ long by 542/x wide ; acetabulum transversely 

 oval, 542|ii long by 697/* wide, situated 1.2 mm from anterior end of 

 body. Digestive tract as described for F. hepatica by other writers. 

 Testes profusely branched, occupying the entire intercecal field from 

 the level of the ovary to about one-fourth of the body length from 

 the posterior end. Cirrus pouch ovoid, not extending caudad be- 

 yond center of acetabulum ; cirrus strongly muscular, not protruded. 

 Ovary branched, situated to right of median line immediately 

 cephalad of testis ; Mehlis's gland globular, 341/* in diameter, situated 

 in median line. Vitellaria profusely developed, extending to level 

 of acetabulum on the right side, but stopping abruptly about 1 mm 

 caudad of acetabulum on the left side ; caudall}' the vitelline follicles 

 completely fill the posttesticular area. Uterus closely coiled and 

 occupying the intercecal field between the anterior testis and acetabu- 

 lum; genital pore 186/* cephalad of anterior margin of acetabulum. 

 Eggs oval, 120/t to 127/* long by 60/* to 67/* wide. 



Hosts. — Herbivorous mammals and man; marine mammals 

 {Orcinus orca^^Orca gladiator; Balaenoptera acutorostrata— B . 

 Tostrata) . 



