TREMATODES FROM FISHES — ^LINTON 131 



lobed; sperm seen in active rotary motion at posterior border of 

 ovary. 



Thirteen, collected July 21, 1911. Nineteen, collected August 3, 

 1911, from stomach of host. Five, collected September 9, 1912, from 

 stomach of host. One, collected July 26, 1918. 



One, collected July 21, 1919. Measurements, life : Length, appendix 

 retracted, 1.35 mm.; breadth, 0.23 mm.; diameter oral sucker, 0.10 

 mm., pharynx, 0.06 mm., ventral sucker, 0.21 mm.; ova, 0.024 by 

 0.012 mm. 



From rudderfish: One, collected August 20, 1910, immature, re- 

 corded here, but not enough of anatomy shown to admit of satisfac- 

 tory determination. Length, including appendix, 1.89 mm., in 

 balsam; length of appendix, 0.56 mm.; breadth at level of ventral 

 sucker, 0.48 mm., behind ventral sucker, 0.38 mm.; diameter of oral 

 sucker, 0.19 mm., of pharynx, 0.10 mm., of ventral sucker, 0.35 mm. 



From bluefish : "Several," collected July 15, 1904. Two (U.S.N.M. 

 No. 8356), collected July 8, 1911. 



From goggler: A small distome and a fragment of another from 

 this host were collected August 27, 1905. Measurements in balsam, 

 appendix retracted: Length, 1.40 mm.; breadth, 0.36 mm.; diameter 

 of oral sucker, 0.10 mm., pharynx, 0.06 mm., ventral sucker, 0.24 mm. ; 

 ova, 0.014 by 0.009 mm. 



From cutlassfish: Two hundred and sixteen (U.S.N.M. No. 8357), 

 collected June 9, 1903, from mouth of host. Measurements in glyc- 

 erin : Length, including appendix, 3 mm. ; breadth, 0.9 mm. ; diameter 

 of oral sucker, 0.16 mm., ventral sucker, 0.38 mm. 



Forty-seven, collected June 15, 1903, from mouth of host. Two 

 hundred and forty, collected July 26, 1903, from stomach of host. 

 Two hundred and eighty-three, collected August 6, from stomach 

 of host. Tliree hundred and thirteen, collected September 16, 1903. 



Two fishes taken at Menemsha Bight were examined August 2, 1904. 

 One of them had been in alcohol for several months, the other in 

 formalin for about three days; 317 distomes were collected from the 

 stomachs, most of them from the formalin specimen. 



One hundred and forty-three, collected June 18, 1913. Largest, 

 in formalin, 3.5 mm., plump, arcuate. More than 50 specimens of 

 various sizes from this host were either mounted in balsam or 

 cleared in acetic-glycerin. All clearly belong to the same species. 

 Measurements in balsam, average of nine: Diameter of oral sucker, 

 0.17 mm., of ventral sucker, 0.43 mm. ; smallest oral sucker, 0.14 mm., 

 largest, 0.21 mm. ; smallest ventral sucker, 0.35 mm., largest, 0.50 mm.; 

 ova about 0.018 by 0.012 mm. 



