TREMATODES FROM FISHES — LINTON 65 



lobed, usually its posterior end three lobed; yolk reservoir dorsal to 

 anterior border of ovary ; seminal receptacle in front of and ventral 

 to yolk reservoir, not clearly defined in mounted material, the sperm 

 may be in the early folds of the uterus ; shell gland ventral, in front 

 of ovary; uterus between ovary and ventral sucker; ova, in balsam 

 mounts, about 0,07 by 0.03 mm. ; vitellaria diffuse, from posterior end 

 along margins without interruption to the ventral sucker. 



Hosts. — ^Long-spined sculpin {Acanthocottus octodecimspinosus) , 

 common eastern stickleback {Gladiunculus hispinosus) , sea raven 

 (Hemitripterus americanus), rusty dab {Limanda feri'uginea)^ tom- 

 cod {Microgadus tomcod)., grubby {Acanthocottus aeneus), coixmion 

 gurnard {MeruUnus caroUnus) , common flatfish (Pseudopleuronectes 

 americanus) ^ tautog {Tautoga onitis). 



Record of collections. — All collections from Acanthocottus octo- 

 decimspinosus made by Vinal N, Edwards. Three, collected April 

 20, 1914, from sculpin; three, May 14, 1914; one, October 20, 1914; 

 five, October 24, 1914, 80 fishes examined; two, October 30, 1914, 

 50 fishes examined. 



Nine, collected April 5, 1915, from sculpin; 34, collected April 12, 

 1915; 22, collected April 26, 1915. 



One, collected April 21, 1916, from sculpin, five fishes examined; 

 37 (U.S.N.M. No. 8220), collected April 24, 1916. 



Many shapes and sizes among formalin material. The length 

 varies from 2.2 mm., with a breadth of 0.52 mm., to 6 mm., breadth, 



2.5 mm. ; ova, 0.08 by 0.05 mm. 



Measurements in balsam: Length, 5.88 mm.; breadth, 1.54 mm.; 

 oral sucker, length, 0.32 mm., breadth, 0.36 mm.; pharynx, length, 

 0.21 mm., breadth, 0.21 mm.; ventral sucker, length, 0.46 mm., 

 breadth, 0.57 mm.; length of esophagus, 0.49 mm.; breadth of first 

 testis, 0.56 mm., of second testis, 0.6 mm.; ova 0.075 by 0.032 mm. 



One (U.S.N.M. No. 8221), collected by Vinal N. Edwards, May 8, 

 1914, from eastern stickleback. Measurements in balsam: Length, 



2.6 mm.; maximum breadth, 0.7 mm.; breadth of oral sucker, 0.2 

 mm., of pharynx, 0.14 mm., of ventral sucker, 0.32 mm., of first testis, 

 0.21 mm. ; ova, 0.07 by 0.033 mm. 



All collections from Hemitripterus americanus made by Vinal N. 

 Edwards. Two, collected November 20, 1911. 



Five of the 43 distomes collected on April 26, 1915, and May 26, 

 1915 (U.S.N.M. No. 8222), from sea raven belong to this species. 



Following are average measurements of seven specimens in balsam, 

 of which the smallest had a length of 2 mm., and breadth of 0.68 nun., 

 and the largest a length of 4.54 mm. and breadth of 1.54 mm. ; Length, 

 3.34 mm.; breadth, 1.03 mm.; breadth of oral sucker, 0.23 mm., of 

 pharynx, 0.14 mm.; ventral sucker, 0.37 mm.; length of esophagus, 



155599—40 5 



