TREMATODES FROM FISHES — LINTON 69 



Lengths in balsam, 3.08 and 1.96 mm. They agree with this species 

 in all essentials. 



From American eel: One, collected September 2, 1903; length, 

 2.32 mm., breadth, 0.38 mm. One, collected August 16, 1912. One, 

 collected April 18, 1913; length in formalin, 4 imn.; measurements 

 in balsam : Length, 3.16 nun., breadth, 0.56 mm. ; oral sucker, length, 

 0.16 mm., breadth, 0.22 nun. ; pharynx, length, 0.14 mm., breadth, 0.14 

 mm.; ventral sucker, lateral view, length, 0.37 mm., breadth, 0.33 

 mm. ; first testis, length, 0.35 mm., breadth, 0.36 mm. 



From lumpfish: One (U.S.N.M. No. 8232), collected May 9, 

 1916, from fish that had been preserved in formalin: Length, 5.5 

 nun., breadth, 1.5 mm. Measurements in balsam : Length, 3.71 mm., 

 breadth, 0.77 mm.; oral sucker, length, 0,2 mm., breadth, 0.21 mm.; 

 pharynx, length, 0.11 mm., breadth, 0.14 mm. ; ventral sucker, length, 

 0.36 nnn., breadth, 0.4 mm. ; length of esophagus, 0.07 mm. ; breadth of 

 first testis, 0.38 mm. ; ova, 0.084 by 0.042 mm. All the lumpfish ex- 

 amined in 1924 and 1926 had been taken in May. Some had been put 

 at once in formalin, others were kept in aquaria. The dates given 

 are those on which the fish were examined: 



Two, June 23, 1924; length, life, 4.5 mm. 



Four, June 24, 1926. Three fishes, which had been preserved in 

 formalin examined; 2 distomes found in each of the two larger; 

 lengths in formalin, 2.5 to 4 mm. 



One, July 6, 1926. Measurements, life : Length, 2.94 mm. ; breadth, 

 0.77 mm.; oral sucker, length, 0.14 mm., breadth, 0.16 nnn. ; pharynx, 

 length, 0.13 mm., breadth, 0.1 mm. ; ventral sucker, length, 0.28 mm., 

 breadth, 0.38 mm.; ova, 0.085 by 0.044 mm. 



Three, July 8, 1926; slender, w^hite, flaccid; length of largest, 9 

 nun.; breadth, 0.67 mm. In balsam these distomes are slender and 

 linear, the breadth of the body at the level of the testes being little 

 more than the breadth of a testis. In the largest of the three the 

 ova few and imperfect and confined to the metraterm. In the others 

 the ova are many and of normal size. 



One, July 10, 1926; slender and, before compression, irregular in 

 outline : Length, 3.78 mm. ; breadth, 0.63 mm. ; breadth of oral sucker, 

 0.19 mm., of pharynx, 0.11 mm., of ventral sucker, 0.45 mm.; ova, 

 0.07 by 0.04 mm. 



One, July 13, 1926, length, 3.45 mm. 



An average of four of these distomes from the lumpfish gives the 

 diameter of the ventral sucker twice that of the oral sucker, and a 

 little less than three times that of the pharynx. 



From common codfish : One, collected December 10, 1914 ; 25 fishes 

 examined; length in formalin, 5.5 mm. 



Twelve (U.S.N.M. No. 8233), collected January 16, 1915; 80 fishes 

 examined ; length in formalin, 2 to 7 mm. 



