TRBMATODES FROM TISHES — LINTON 121 



From round herring : Small appendiculate distomes were found in 

 young round herring in 1908 on two dates in July and on five dates 

 in August. Ten distomes were obtained from 110 fishes. Six of 

 these distomes, all immature, belong to the species U. appoidicuTatus, 

 Measurements of one in balsam : Length, 0.58 mm. ; breadth, 0.11 mm. ; 

 diameter of oral sucker, 0.03 mm., of pharynx, 0.015 mm., of ventral 

 sucker, 0.06 mm. (U.S.N.M. No. 8320). 



From common eastern stickleback: One, collected July 20, 1910. 

 Measurements in life : Length, 1.68 mm. ; breadth, 0.22 mm. ; diameter 

 of oral sucker, 0.07 mm., of pharynx, 0.05 mm., of ventral sucker, 0.18 

 mm. ; ova, 0.027 by 0.012 mm. 



From rudderfish {Palhmrichthys perciforinis) : Several (U.S. 

 N.M.) No. 8321), collected August 6, 1904. Measurements in 

 balsam: Length, including appendix, 1 mm., breadth, 0.17 mm.; di- 

 ameter of oral sucker, 0.05 mm., pharynx, 0.02 mm., ventral sucker, 

 0.09 mm. ; ova, 0.02 by 0.01 mm. 



Four, immature, collected August 19, 1929. (1) Measurements in 

 Ijalsam, including appendix, 1.96 mm., breadth, 0.28 mm.; diameter 

 oral sucker, 0.04 mm., pharynx, 0.02 mm., ventral sucker, 0.07 mm. 

 (2) Length, 1.75 mm.; breadth, 0.50 mm.; diameter oral sucker, 0.2 

 mm., pharynx, 0.01 mm., ventral sucker, 0.04 mm. 



From common mackerel : One, collected August 3, 1905. 



From rudderfish {Seriola sonata): Two (U.S.N.M. No. 8327), 

 collected August 16, 1910. Measurements, balsam: Length, includ- 

 ing appendix, 1.47 mm.; breadth, 0.25 mm.; diameter oral sucker, 

 0.06 mm., of pharynx, 0.03 mm., of ventral sucker, 0.12 mm.; ova, 

 collapsed, about 0.024 by 0.012 mm. A note, made at the time of 

 collecting these distomes, states that sperm was seen rotating rapidly 

 in the seminal receptacle, in anticlockwise fashion. The specimen 

 was presumably being observed from the ventral side. 



Four, collected August 19, 1929. Measurements in agreement with 

 the foregoing. 



From summer flounder: One, collected July 20, 1904. One, col- 

 lected August 15, 1906. 



From pollack: One (U.S.N.M. No. 8322), collected August 19, 

 1908. Measurements, life : Length, not including appendix, 2.17 mm. ; 

 breadth, 0.42 mm. ; diameter oral sucker, 0.07 mm., pharynx, 0.04 mm., 

 ventral sucker, 0.17 mm. ; ova, 0.027 by 0.010 mm. Length in balsam, 

 1.40 mm. 



From glut herring: Fifty or more, collected September 6, 1910. 

 Lengths from 0.5 mm. to 2.25 mm., all with ova. Measurements of 

 one, life, compressed, appendix retracted, 1.68 mm., breadth, 0.53 

 mm.; diameter oral sucker, 0.08 mm., pharynx, 0.04 mm., ventral 

 sucker, 0.19 mm., ova 0.027 by 0.010 mm., slightly reniform. 



Forty (U.S.N.M. No. 8323), collected September 18, 1913. 



