TREMATODES FROM FISHES — LINTON 73 



From the American smelt : Collected by Vinal N. Edwards on two 

 dates: Five, January 25, 1910. Thirty-six (U.S.N.M. No. 8239), 

 Jmie 20, 1914. In formalin, length of body, 5.8 mm., of neck, O.Y mm. ; 

 diameter of body, 0.6 mm. Elongated, in most cases arcuate; necks 

 short, arcuate, some reflected dorsally. Measurements, balsam: 

 Length, 4.41 mm., breadth, 0.42 mm. ; oral sucker, 0.14 mm., breadth, 

 0.15 mm.; pharynx, length, 0.13 mm., breadth, 0.08 mm.; ventral 

 sucker, length, 0.28 mm., breadth, 0.29 mm.; ova, 0.08 by 0.04 mm. 



From the summer flounder : Collected by Vinal N. Edwards on two 

 dates: Two (U.S.N.M. No. 8240), September 20, 1915. Measure- 

 ments in balsam: Length, 4.06 mm., breadth, 0.35 mm.; oral sucker, 

 length, 0.14 mm., breadth, 0.15 mm.; pharynx, length, 0.08 mm., 

 breadth, 0.1 mm. ; ventral sucker, length, 0.25 mm., breadth, 0.21 mm. ; 

 first testis, length, 0.28 mm., breadth, 0.2 mm. ; ova, 0.075 by 0.045 mm. 

 Lateral view : Seventeen, October 3, 1915, 3 mm. to 6 mm. in length ; 

 slender, turgid. 



From the yellow perch: One (U.S.N.M. No. 8241), collected April 

 23, 1914; length in formalin, 7 mm. Measurements in balsam: 

 Length, 6.16 mm., breadth, 0.59 mm. ; oral sucker, length, 0.21 mm., 

 breadth, 0.12 mm.; pharynx, length, 0.12 mm., breadth, 0.11 mm.; 

 ventral sucker, length, 0.31 mm., breadth, 0.33 mm. ; length of esopha- 

 gus, 0.15 mn;i. ; first testis, length, 0.49 mm., breadth, 0.5 mm.; ova, 

 0.078 by 0.042 mm. There is a distinct seminal receptacle dorsal to 

 the ovary and extending forward dorsal to the yolk reservoir. 



From the codling: One, collected November 17, 1913; 30 fishes 

 examined; length, 4.5 mm. in formalin. One (U.S.N.M. No. 8242), 

 collected May 28, 1914; 10 fishes examined; length, 2.5 mm. in for- 

 malin. One, small, collected by Dr. G. A. MacCallum, August 20, 

 1915. Measurements, balsam: Length, 1.85 mm., breadth, 0.56 mm.; 

 oral sucker, length, 0.13 mm., breadth, 0.17 mm.; pharynx, length, 

 0.07 mm., breadth, 0.1 mm. ; ventral sucker, length, 0.28 mm., breadth, 

 0.38 mm.; breadth of first testis, 0.31 mm.; ova, 0.072 by 0.036 mm. 



From the pollack : Twenty-four, collected August 19, 1908. Four 

 (U.S.N.M. No. 8243), collected April 20, 1914. One, collected April 

 8, 1915. One, collected August 30, 1920. Length in balsam, 1.72 mm. 

 to 4 mm. Measurements of one in balsam: Length, 1,92 mm., 

 breadth, 0.53 mm, ; oral sucker, length, 0.14 mm., breadth, 0.13 mm. ; 

 pharynx, length, 0.08 mm., breadth, 0.08 mm. ; ventral sucker, length, 

 0.25 mm., breachh, 0.3 mm.; length of esophagus, 0.11 mm.; ova, 

 0.072 by 0.036 mm, A prepharynx, could be distinguished in a few 

 specimens which had been flattened. 



From the common gurnard: Two (U,S,N,M, No, 8244), collected 

 April 16, 1915; lengths in formalin, 2 mm. and 3.5 mm. Measure- 

 ments in balsam : Length, 2.32 mm., breadth, 0.77 mm, ; oral sucker, 



