170 PROCEEDINGS OF THE NATIONAL MUSEUM vol.88 



From remora: Two (U.S.N.M. No. 8409), collected August 3, 

 1911 ; one of these was encysted in the stomach wall. 



Measurements in balsam : Length, 3.78 mm. ; breadth, at level of 

 oral sucker, 0.07 mm., at level of ventral sucker, maximum, 0.30 mm., 

 thence tapering to 0.14 mm. at posterior end ; oral sucker, length, 0.08 

 mm., breadth, 0.06 mm.; ventral sucker, length, 0.11 mm., breadth, 

 0.10 mm. When one of these distomes was fixed under pressure the 

 characteristic constrictions of the intestinal rami in large measure 

 disappeared (figures 346, 347). 



DISTOMA species 

 Plate 26, Figtjkes 349, 350 



Record is here made of two trematodes from the kingfish. Both 

 specimens are more or less macerated, and the very numerous ova 

 obscure the genitalia in great degree. 



Neck slender and tapering, body of about uniform breadth; pre- 

 pharynx and esophagus both present, the latter relatively long ; cirrus 

 pouch large and elongated, enclosing the seminal vesicle ; testes in the 

 posterior third, their outlines obscured by ova; ovary median, in front 

 of testes, and a short distance behind the posterior end of the cirrus 

 pouch, apparently lobed. The vitellaria, consisting of six or eight 

 follicles on each side, extends from the level of the ovary forward to 

 the level of the posterior end of the cirrus pouch. The uterus, 

 crowded with ova, fills the body from the cirrus pouch to the pos- 

 terior end. The metraterm is much expanded and has thick, muscular 

 walls. Musculature of ventral sucker weak. 



These trematodes resemble unidentified forms from Orthopristis 

 chrysopterus (Bull. U. S. Bur. Fish., vol. 24, pp. 379, 380, figs. 216, 

 218, 1905). 



Host. — Kingfish {Menticin^hus saxatilis). 



Record of colUctwris : One (U.S.N.M. No. 8410), collected Sep- 

 tember 11, 1907. Anterior third, from level of genital pore, slender, 

 tapering ; posterior two thirds of length rather slender and of nearly 

 uniform breadtli. Measurements in balsam : Length, 2.21 mm. ; 

 breadth, anterior, 0.07 mm., at level of genital pore (0.5 mm, from 

 anterior end) 0.28 mm.; diameter of oral sucker, 0.06 mm., of ventral 

 sucker, 0.075 mm. ; pharynx, length, 0.036 mm., breadth, 0.024 mm. ; 

 length of prepharynx, 0.09 mm., of esophagus, 0.42 mm. ; ova, 0.021 

 by 0.012 mm. 



One, collected July 21, 1926. Slender, fusiform, anterior end miss- 

 ing. Measurements in balsam : Length, 2.10 mm. ; breadth, from level 

 of genital pore to posterior end, 0.28 mm. ; ova, 0.021 by 0.015 mm. 



