30 PROCEEDINGS OP THE NATIONAL MUSEUM vol.8] 



from the anterior end. Genital pore preacetabular and median in 

 position. Testes spherical or lobed, slightly oblique in position and 

 situated in the posterior part of the body. Ovary biscuit shaped; 

 seminal receptacle generally spindle shaped, situated caudad and to 

 the right of the ovary ; Mehlis's gland indistinct. Vitellaria lateral 

 to intestinal ceca, consisting of eight groups of follicles on each side 

 of body divided into two regions by a break between the fourth and 

 fifth groups, and extending from a short distance caudad of the 

 acetabulum to the ends of the intestinal ceca. Uterus consisting of 

 transverse coils which extend intercecally from the ovary to the 

 acetabulum. Eggs oval, 29/x, to 33/x long by 12|u, to 14/i, wide. 



Hosts. — Delphinus tacuschi {])voh&h\y^ Sot alia tucuxi)^ (?) 

 Orcaella hrevirostris. 



Location. — Not given ; probably bile ducts. 



Distribution. — Sou:th America (Brazil — Barra do Rio Negro), 

 (?) Asia (India). 



Cobbold (1876) reported what he thought was this species from 

 Orcaella hrevirostris, the specimens upon which the report was based 

 having been collected in " the North-eastern Province of India " by 

 Dr. John Anderson, superintendent of the Indian Museum, Calcutta. 

 The character which apparently caused Cobbold to regard the form 

 from India as the same as that from Brazil was the "irregularly 

 serrated " margin of the body, since he states : " I know of no other 

 trematode possessing these sinuosities." The description and figure 

 which he gave are quite different than those given by Diesing (1855) 

 and by Weski (1900). The writer doubts whether the form which 

 Cobbold calls Distoma lancea is the same as Diesing's species, but on 

 account of the incompleteness of his description and figure, no opin- 

 ion is expressed as to its probable affinities. 



Subfamily Metorchiinae Liihe, 1909 



Suh family diagnosis. — Opisthorchiidae : Excretory pore ventral; 

 stem of excretory vesicle usually short, ventral to testes. Vitellaria 

 extend cephalad of acetabulum. Uterine coils frequently overlap 

 ceca and extend cephalad of acetabulum. 



Type geniis. — Metorchis Looss, 1899. 



KETS" TO GENERA OF METORCHIINAE OCCUREING IN MARINE MAMMALS 



1. Posterior end truncate and suckerlike Pseudamphistomum (p. 31). 



Posterior end rounded Metorchis (p. 30). 



Genus METORCHIS Looss, 1899 



Generic diagnosis. — Metorchiinae: Body rounded posteriorly and 

 attenuated anteriorly. Cuticle usually covered with spines. Intes- 

 tinal ceca extend to posterior end of body. Testes large, usually 



