140 PROCEEDINGS OF THE NATIONAL. MUSEUM Tor,. 88 



From sea raven: One, collected October 11, 1911. Measurements 

 in balsam : Oral sucker, length, 0.22 mm. ; breadth, 0.25 mm. ; pharynx, 

 length, 0.14 mm., breadth, 0.18 mm.; ventral sucker, length, 0.63 mm., 

 breadth, 0.70 mm. Specimen contracted, intestines in dense coils at 

 posterior end ; anatomy obscured by masses of ova. 



From silver hake: One, collected October 31, 1911. In formalin, 

 body plump, nearly cylindrical; neck short, subcylindrical, curved 

 ventrad, concealing the ventral sucker; length, 4 mm.; diameter, 

 2 mm. Measurements in balsam, appendix retracted: Length, 3.36 

 mm. ; breadth, 1.54 mm. ; diameter of oral sucker, 0.28 mm., of phar- 

 ynx, 0.22 imn., of ventral sucker, 0.70 mm. ; ova, 0.015 by 0.012 mm. 



From silversides : Few, collected August 25, 1906. Three, collected 

 August 10, 1910. One, collected August 11, 1910. Measurements, life, 

 compressed : Length, 5,36 mm. ; breadth, 1.82 mm. ; diameter of oral 

 sucker, 0.25 mm., of pharynx, 0.18 mm., of ventral sucker, 0.61 mm. ; 

 ova, 0.018 by 0.012 mm. ; folds of uterus voluminous. Two (U.S.N.M. 

 No. 8367), collected July 30, 1929. 



From kingfish : One (U.S.N.M. No. 8368), collected August 28, 1928. 

 Thirty-four fishes, from 75 to 123 mm. in length, examined. Length, 

 in balsam, 8 mm. ; maximum breadth, 2 mm. from anterior end, 1.82 

 mm., tapering to about 0.28 mm. near each end; diameter of oral 

 sucker, 0.18 mm., of pharynx, 0.14 mm., of ventral sucker, 0.49 mm; 

 distance from anterior end to ventral sucker, 0.42 mm.; ova about 

 0.015 by 0.012 mm., much crowded and difficult to measure. 



From toadfish: Three, collected August 15, 1899. Flesh color, ex- 

 cept where the ova impart a yellowish tinge and the vitellaria a 

 brownish color ; plump, and of exceeding diversity of shape ; posterior 

 end with concentric wrinkles, often button-shaped. Body cylindri- 

 cal, neck conical and very extensible. In some cases the neck and ven- 

 tral sucker would be on a slender stalk, and the greater part of the 

 body gathered into a globular mass at the posterior end. Then, in a 

 few seconds, the worm would become nearly spherical. Length of 

 one at rest, 5 mm., diameter, 1.7 mm. In a series of sagittal sections 

 the length is about 5 mm. and the diameter 1.5 mm. ; the largest cross 

 sections measure 1.29 mm. in vertical and 1.23 mm. in transverse 

 diameter; oral sucker, length, 0.24 mm., diameter, 0.19 mm.; diam- 

 eter of pharynx, 0.15 mm., of ventral sucker, 0.49 mm. ; ova, 0.018 by 

 0.012 mm. 



From summer flounder : Three, collected October 1, 1903. Lengths 

 in formalin, 2.5 mm., 3 mm., and 3.5 mm, ; diameter of neck, 0.7 mm., 

 of body, 1,5 mm. ; ova, 0.018 by 0.012 mm. 



One (U.S.N.M. No. 8369), collected September 23, 1912. Length, 

 6 mm. in formalin. 



