TREMATODES FROM FISHES — LINTON 135 



One (U.S.N.M. No. 8362), collected July 25, 1919, from a 7-mni. 

 fish. Lobes of vitellaria short, about as broad as long. 



From cunner: One to five immature distomes, collected June 30, 

 1919, 0.27 to 0.46 mm. in length, from each of nine young cunners 

 from 9 to 15' mm. in length. One distome \\-ith ova from a 9-mm. fish. 



Five, collected July 15, 1919, from a 10-mm. fish. Eight, collected 

 July 21, 1919, from a 12-mm. fish. 



Five (U.S.N.M. No. 8363), collected July 25, 1919, from a 10-mm. 

 fish. Measurements in balsam : Length, 0.38 mm. ; breadth, 0.24 mm. ; 

 diameter oral sucker, 0.07 mm., ventral sucker, 0.12 mm. ; ova, 0.018 

 by 0.009 mm. 



Twelve, collected August 21, 1919, from a 21-mm. fish, and one from 

 a 20-mm. fish. 



One distome from the stomach of a small cunner was still apparently 

 in place in a copepod. 



Average measurements of nine distomes from young cunners: 

 Length, 0.33 mm.; breadth, 0.19 mm.; diameter of oral sucker, 0.06 

 mm., ventral sucker, 0.10 mm. 



Note on a living specimen, July 15, 1919 : Testes close behind ventral 

 sucker; ovary behind testes; vitellaria posterior to ovary, lobed in 

 manner characteristic of the genus Lecithaster; seminal receptacle a 

 little way behind level of testes, dorsal ; seminal vesicle dorsal to ven- 

 tral sucker, ejaculatory duct surrounded by coarse prostatic cells; 

 cirrus not evident; intestines reach to near posterior end; folds of 

 uterus amid other organs, from posterior end to ventral sucker; 

 metraterm passing dorsal to ventral sucker to genital pore. 



LECITHASTER GIBBOSUS (Rudolphi) 



Plate 11, Figuees 125, 126 



Dlstomum bothryophoron Olsson, Linton, Bull. U. S. Fish Comm. for 1899, 



p. 437 (from Clupea harengits), 1901. 

 Lecithaster gibhosus (Rudolphi), Odhner, Die Trematoden des arktischen 



Gebietes, Fauna Arctica, vol. 4, pp. 856-359, 1905. — Looss, Zool. Jahrb., vol. 



26, pp. 164, 165, 1907.— Mantee, Illinois Biol. Mon., vol. 10, No. 2, pp. 95, 96, 



fig. 61, 1926. 



Small distomes belonging to the genus Lecithaster, which agree 

 closely with this species, are recorded. 



Hosts. — Silversides {Menidia notata), common scuj:) {Sfenoiom,us 

 chrysops). 



Record of collections. — From silversides: Distomum sp. recorded 

 from this host (Bull. U. S. Fish Comm. for 1899, p. 444, figs. 357, 358, 

 1901) probably belong here. Small distomes, collected August 11, 

 1919, noted while examining young silversides for their food. One 

 to nine found in each of six fishes, measuring 25 to 85 mm. in length. 



