TREMATODES FROM FISHES — LINTON 133 



The distomes referred to the species L. confusus are fusiform, ante- 

 rior end rather bluntly rounded, posterior end tapering; greatest 

 diameter at about level of ventral sucker, or a little behind it ; ventral 

 sucker much larger than oral; no prepharynx, esophagus none, or 

 very short; intestinal rami extend to posterior end, in some cases 

 inflated and conspicuous; genital pore about half-way between oral 

 and ventral suckers; ejaculatory duct long, surrounded by prostatic 

 cells; seminal vesicle dorsal to and extending back of the ventral 

 sucker. Testes nearly transversely placed, a short distance behind 

 ventral sucker. Ovary four-lobed, lobes blunt, behind testes; vitel- 

 laria behind ovary, seven-lobed, lobes more or less pyriform. The 

 folds of the uterus fill the body from the level of the anterior border 

 of the ventral sucker to the posterior end. The metraterm passes 

 from the dorsal border of the ventral sucker to the genital pore. Ova 

 very numerous and small, approximating 0.015 by 0.009 mm. 



The above description is based on material from the hickory shad 

 {Pomolohus 7nediocris). 



Hosts. — Black sea bass {Gentropristes striatus), common herring 

 {Clupea harengits), round herring {Etrumeus sadina), hickory shad 

 {Pomolohus mediocri-s), dollarfish {Poronotus triaca7ithus) , common 

 mackerel {ScoTnher scomhrus), puffer {/Sphoeroides maculatus), cun- 

 ner (Taufogolabrus adspersus). 



Record of collections. — From black sea bass: Immature distomes 

 (U.S.N.M. No. 8358), from 0.23 to 0.35 mm. in length, were found on 

 June 30, 1919, in young sea bass, one from a 7-mm. fish, one to four 

 from each of five 9-mm. fish; one, with ova, from a 6-mm. fish. 

 Measurements in formalin: Length, 0.30 mm.; breadth, 0.16 mm.; 

 diameter oral sucker, 0.06 mm., pharynx, 0.03 mm., ventral sucker, 

 0.09 mm.; ova, 0.015 to 0.018 by 0.009 mm. Seminal vesicle extends 

 back of ventral sucker. 



From common herring : Three small distomes, collected August 29, 

 1919, largest 1 mm. in length, from a 56-mm. herring. Measurements 

 in balsam: Length, 0.70 mm., breadth, 0.21 mm.; diameter oral 

 sucker, 0.06 mm., pharjmx, 0.036 mm., ventral sucker, 0.16 mm. ; ova 

 collapsed and crowded, about 0.015 by 0.009 mm. 



From round herring: Immature distomes belonging to the genus 

 Lecithaster. Three, collected August 7, 1908; length, 0.65 mm. 

 Three, collected August 8, 1908; length, 0.50 mm.; breadth, 0.22 mm.; 

 diameter oral sucker, 0.04 mm., pharynx, 0.03 mm., ventral sucker, 

 0.09 mm. One, collected August 10, 1908 ; length, 0.57 mm. ; breadth, 

 0.14 mm.; diameter oral sucker, 0.045 mm.; pharynx, 0.03 by 0.04 

 mm., ventral sucker, 0.10 mm. 



From hickory shad: Thirteen, collected June 10, 1907. One 

 (U.S.N.M. No. 8359), collected June 21, 1913; four fishes exammed: 



