8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



the follicles do not extend medially much beyond the inner limits of 

 the intestine in the testicular and pretesticular zones, but com- 

 pletely fill the posttesticular zone. The uterus is relatively short, 

 consisting of a few loops confined to the intercecal field between the 

 ovary and acetabulum; vagina about one-half the length of cirrus 

 pouch, muscular, and without spines. Eggs 90/* to 97)u, long by 45jli 

 wide, oval in outline, but more or less triangular in cross section; 

 shell yellow, thickened to form a knoblike projection at posterior 

 pole ; opercular pole flat. 



Host. — Phocaena. fhocoena {=Phocaena communis). 



Location. — Bile ducts. 



Distribution. — Europe; North America (United States). 



Remarks. — The above description is based upon specimens 

 (U.S.N.M. Helm. Coll. No. 8415) collected by Dr. G. A. MacCallum, 

 June 27, 1925, from the liver of Phocaena yhocoena at Woods Hole, 

 Mass. Two additional lots of specimens have also been examined. 

 The first of these (U.S.N.M. Helm. Coll. No. 3379) was collected 

 by Prof. Max Braun from the liver of Phocaena commu/nis at 

 Warnemiinde, and identified as CampuJa ohlonga. The date of col- 

 lection is not given, but it is probable that this is a part of the ma- 

 terial upon which his (1900) description of this species is based. 

 The second lot of specimens (U.S.N.M. Helm. Coll. No. 16682) is 

 labeled " Campula ohlonga.^ liver, Phocaena co')n7nunis, Millport. 

 August 15, 1908, determined by Wm. Nicoll." In the case of this 

 material, there appears to be no doubt that this represents a part 

 of the specimens described by Nicoll in 1909. The specimens com- 

 prising both of these lots agree in all essentials with those from the 

 MacCallum collection. 



One of the outstanding characters which distinguish C. ohlonga 

 from all other species of the genus is the presence of anal openings. 

 These structures are quite distinct and were found to occur in all 

 specimens examined. 



Anal openings have been reported as occurring in species belong- 

 ing to the family Echinostomatidae by Leiper (1908) and by Odhner 

 (1910c) ; in the Steringophoridae by Odhner (1911) ; in the Accacoe- 

 liidae by Looss (1912) ; in the Azygiidae and AUocreadiidae, and in 

 JSchistorchis cameus (syn. Pleorchis olig orchis; family uncertain) by 

 Odhner (1928) ; in the Opecoelidae by Ozaki (1925; 1928) ; and in 

 the Diploproctodaeidae by LaRue (1926) and by Ozaki (1928). 

 Stunkard (1930) also demonstrated the presence of these openings 

 in Distomum sp. of Linton, 1899, and proposed a new genus and 

 species, Bianium conca^u/m^ for this trematode. 



The genetic significance of the occurrence of anal openings in 

 these worms is not clear. In two of the families, Opecoelidae and 

 Diploproctodaeidae, these structures are present in all species in- 



