TREMATODES FROM FISHES — LINTON 127 



0.14 mm. Three, collected October 20, 1914. Twenty-two, collected 

 November 5, 1914. 



From American eel: One, collected December 6, 1909. Seven 

 (U.S.N.M. No. 8337), collected June 13, 1913; 1.40 mm. to 2.47 mm., 

 excluding appendix, in formalin. Forty, collected July 10, 1914, in 

 washings from intestines of 9 eels. Dr. G. A. MacCallum also found 

 a number on the gills. 



Average measurements of nine specimens mounted in balsam, and 

 varying in length from 1.26 to 1.92 mm. : Length, 1.42 mm. ; breadth, 

 0.36 mm.; diameter of oral sucker, 0.136 mm., phaiynx, 0.06 mm., 

 ventral sucker, 0.139 mm.; ova, 0.024 by 0.012 mm. 



From common herring: One, collected November 11, 1904; length, 

 2.5 mm. in formalin. One, collected November 4, 1911; length, 3.7 

 mm. in formalin. Two, collected November 8; length, 3 mm. in 

 formalin. Three, collected July 17, 1920. Three (U.S.N.M. No. 

 8338), collected August 17, 1920, from a 60-mm. fish. Measurements, 

 life: Length, 2.10 mm., breadth, 0.49 mm.; diameter of oral sucker, 

 0.25 mm., of ventral sucker, 0.25 mm. 



These distomes from the herring when compared with those from 

 the eel agree in those characters which have been enumerated. Dif- 

 ferences in outline of the vitellaria occur, but in general they resemble 

 those of the eel distomes, varying from obscurely lobed to distinctly 

 lobed examples. 



Average measurements of eight in balsam varying in length from 

 1.05 to 2.10 mm.: Length, 1.66 mm.; breadth, 0.40 mm.; diameter of 

 oral sucker, 0.15 mm., pharynx, 0.07 mm., ventral sucker, 0.15 mm.; 

 ova, 0.024 by 0.012 mm. 



From fishingfrog: One (U.S.N.M. No. 8340), collected August 3, 

 1910. Measurements, balsam: Length, ex. appendix, 1.40 mm.; 

 breadth, 0.42 mm.; diameter oral sucker, 0.17 mm., pharynx, 0.08 

 mra., ventral sucker, 0.17 mm.; ova, collapsed and crowded, about 

 0.021 by 0.009 mm. One, collected December 6, 1912. 



From silversides {Menidia notata) : A small, immature, yellowish 

 distome, collected August 11, 1919, from a 28-mm. fish, is here re- 

 corded. Length, life, 0.24 mm.; breadth, 0.04 mm.; diameter oral 

 sucker, 0.03 mm., ventral sucker, 0.03 mm. 



From kingfish: One (U.S.N.M. No. 8341), collected September 9, 

 1908, from intestine. Measurements in balsam, appendix retracted: 

 Length, 1.76 mm. ; breadth, 0.36 mm. ; diameter oral sucker, 0.16 mm., 

 pharynx, 0.08 mm., ventral sucker, 0.17 mm. ; ova, 0.021 by 0.012 mm. 



One, collected July 19, 1910. Measurements, life, appendix partly 

 retracted : Length, 1.50 mm. ; breadth, 0.28 mm. ; ova, 0.028 by 0.016 

 mm. In balsam the diameter of the oral sucker is 0.126 mm., 

 pharynx, 0.06 mm., ventral sucker, 0.135 mm. ; ova, 0.021 by 0.012 mm. 



