122 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 88 



From hickory shad : One hundred and fifty, collected August 15, 

 1906, from intestine of one fish. 



Fifty-five (U.S.N.M. No. 8324), collected September 5, 1913, from 

 one fish. Measurements, balsam: Length, including appendix, 1.43 

 mm.; breadth, 0.32 mm.; length of appendix, 0.53 mm.; diameter 

 oral sucker, 0.08 mm., pharynx, 0.04 mm., ventral sucker, 0.19 mm.; 

 ova, collapsed and crowded together, about 0.024 by 0.012 mm. 



From alewife: One, collected July 26, 1906. One (U.S.N.M. No. 

 8325), collected August 30, 1910. 



Eight distomes from this host in old collection, in balsam, have 

 an average length of 1.88 mm. ; average length of body, 1.25 mm. ; of 

 appendix, 0.63 mm. ; maximum length, 2.59 mm., minimum, 1.24 mm. 

 Measurements of one in balsam: Length, including appendix, 2.56 

 mm.; breadth, 0.36 mm.; diameter oral sucker, 0.07 nmi., pharynx, 

 0.04 mm., ventral sucker, 0.14 mm. ; ova, collapsed and crowded, about 

 0.024 by 0.012. At the time of collecting, sperm was noted in rapid 

 rotary motion in the seminal receptacle, while quiescent sperm filled 

 the early portion of the uterus at the posterior border of the ovary. 



Note on distomes found in the food of young alewives, August 27, 

 1920: Thirty distomes were counted in a small bit of debris from 

 the intestine of a 50-mm. fish; length of distomes about 0.33 mm. 

 One hundred and fifty were counted in the bottom of a dish in 

 which the contents of the stomach and intestine of a 57-mm. alewife 

 had been washed ; lengths of distomes from 0.35 to 0.70 mm. Others 

 were noted in a 57, a 65, and a 72-mm. fish. Measurements of one 

 in balsam : Length, 0.36 mm. ; breadth, 0.14 mm. ; diameter of oral 

 sucker, 0.06 mm., ventral sucker, 0.09 mm. ; ova, 0.021 by 0.012 mm. 



From winter flounder: Following is a summary of appendiculate 

 distomes referred to the species H. appendiculatus, noted while exam- 

 ining young winter flounders for their food : 



Table 30. — Record of distomes of Hemiurus appendiculatus f7-oin young 

 Pseudopleuronectes americanus 



> Worms mainly from stomachs; smallest number in a single host 3, in a 37-mm.fish; largest number in 

 a single host 317, in a 30-mra. fish. 



> From a 72-mm. fish 



> From a &2-mm. fish. 



• From a 120-mm. fish. 



