148 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.88 



developed. In a specimen mounted in balsam, copulatory organ 

 everted, the length of the prostate is 0.70 mm., its diameter 0.14 mm., 

 ejaculatory duct somewhat convoluted. In a series of sagittal sec- 

 tions, copulatory organ retracted, the length of the prostate is 0.56 

 mm., diameter, 0.50 mm. ; ejaculatory duct much convoluted. Seminal 

 vesicle tubular, convoluted, dorsal to and behind ventral sucker ; first 

 testis some distance back of ventral sucker; folds of uterus behind 

 ovary and also between ventral sucker and first testis; vitellaria 

 behind ventral sucker, extending nearly to ovary. Ova, 0.027 by 

 0.019 mm. to 0.03 by 0.021 mm. 



Measurements, balsam, lateral view : Length, 12.00 mm., maximum 

 diameter, 1.12 mm.; oral sucker, length, 0.70 mm., breadth, 0.63 mm.; 

 pharynx, length, 0.35 mm., breadth, 0.14 mm.; ventral sucker, 0.91 

 mm., breadth, 0.63 mm. ; anterior end to posterior border of ventral 

 sucker, 2.38 mm. ; anterior end to first testis, 3.36 mm. ; second testis 

 to ovary, 0.28 mm. ; ovary to posterior end, 4.42 mm. 



Host. — Ocean sunfish {Mola mola). 



Record of collections. — Eleven (U.S.N.M. No. 8383), collected 

 July 20, 1914, from intestine of host. 



One, collected September 3, 1925, from intestine of host. Length 

 of neck, 4 mm., length of body back of ventral sucker, 40 mm.; 

 length of ventral sucker and pedicel, 3 mm. 



Several, collected July 19, 1926, found in intestine of host; num- 

 ber not recorded. 



Thirteen, collected July 13, 1927, in intestine of host. 



Genus OROPHOCOTYLE Looss, 1902 



OROPHOCOTYLE FOLIATA (Linton) 



Distomnm foliatum Liuton, Proc. U. S. Nat. Mas., vol. 20, pp. 532-534, pi. ."50, 

 figs. 1-3; pi. 51, figs. 1-4, 189S; Bull. U. S. Fisli Comm. for 1899, p. 282, 

 1900; iUd; p. 4GG, 1901.— Sumneb, Osburn, and Cole, Bull. U. S. Bur. 

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



Orophocotyle foliata (Linton), Looss, Centralbl Bakt., Parasit., vol. 31, p. 644, 

 1902.— Odhner, Zool. Anz., vol. 77, p. 175, 1928. 



Odhner ^^ is of the opinion that Monticelli's Distomnm calyptroco- 

 tyle is the immature form of D. foliatum. 



Smooth; ventral sucker with accessory lobes, often pedicelled, 

 much larger than oral; genital pore a short distance behind oral 

 sucker; copulatory organ short; ejaculatory duct rather short, con- 

 voluted; prostate not large; convoluted seminal vesicle in front of 

 ventral sucker, some of its folds dorsal to prostatic portion of 

 ejaculatory duct. First testis, in some cases near, even on a level 



1= Zool. Anz., vol. 38, p. 525, 1911 ; vol. 77, p. 175, 1928. 



