146 



PROCEEDINGS OF THE ISTATIONAL. MUSEUM 



VOL. 88 



tal pore at level of posterior edge of oral sucker; copulatory organ 

 large; ejaculatory duct convoluted, surrounded by prostatic cells; 

 convoluted seminal vesicle, dorsal to ventral sucker; first testis some 

 distance behind ventral sucker; vitellaria mainly behind ovary. 



Measurements made on a series of sagittal sections: Length, 10.00 

 mm.; maximum breadth, 1.60 mm.; oral sucker, lengili, 0.70 mm., 

 breadth, 0.91 mm.; pharynx, length, 0.42 mm., breadth, 0.21 mm.; 

 ventral sucker, length, 1.19 mm., breadth, 1.40 mm.; anterior end to 

 posterior edge of ventral sucker, 3.78 mm.; anterior end to first 

 testis, 5.18 mm.; second testis to ovary, 0.56 mm.; ova, maximum, 

 about 0.033 by 0.021 mm. 



Table 36. — Measurements of four specimens of Accacoelium contortum in Mlsam. 



Measurement 



Length - 



Maximum breadth 



Oral sucker, length 



Oral sucker, breadth 



Pharynx, length, 



Pharynx, breadth 



Ventral sucker, length 



Ventral sucker, breadth 



Length of ventral sucker and pedicel 



Mm. 

 16.00 



1.00 

 .56 

 .50 

 .28 

 .14 

 .77 

 .66 



2.10 



JSost. — Ocean sunfish {Mola mola) . 



Record of collections. — A collection (U.S.N.M. No. 8379), of July 

 20, 1914. Number not recorded in notes. Heads and necks inserted 

 in mucous membrane of pharynx ; body slender, cylindrical, tapering 

 to posterior end, yellowish. These worms were still active after lying 

 in sea water over night. 



Twenty -five (U.S.N.M. No. 8380), collected September 3, 1925, in 

 one mass in pharynx of host. These distomes were found by Dr. 

 G. A. MacCallum while examining the gills of a sunfish. 



Twenty-five, collected July 19, 1926, in anterior portion of alimen- 

 tary canal, and on gills. 



Genus ACCACLADOCOELIUM Odhner, 1928 

 ACCACLADOCOELIUM MACROCOTYLE (Diesingr) 



Distomum macrocotyle Diesing, Linton, Proc. U. S. Nat. Mus., vol. 20, pp. 522, 

 523, pi. 45, figs. 8-10, pi. 46, figs. 1-5, 1898 ; Bull. U. S. Fish Comm. for 1899, 

 p. 282, 1900 ; ibid., p. 466, 1901.— Sumner, Osbukn, and Cole, Bull. U. S. Bur. 

 Fish., vol. 31, pt. 2, p. 583 1911. 



Aocacladocoelhim macrocotyle (Diesing), Odhneb, Zool. Anz., vol. 77, p. 172 

 1928. 



