KtUozoa of Dritisli Marine Fishes. 73 



T R E M A TO I) A. 



Poducohjle aiomoti, Kud. (PI. I. figs. 1, 2.) 



Distoma xiiuplev, lliid. ?, Olsson, Levinsen, GronlanJs Trematodfauna, 



p. 8, i>l. iii. li-r. 1. 

 Altttcrradium aloinon (Ilud.), Odhner, Zool. Jiilirb. Syst. xiv. p. 500, 



pi. 3;{. ti^r.-^. {>, 10. 

 Pixloiofi/le atomoH (Rud.), Odbncr, Fauna Arclica, iv. (2) p. 320, 



pi. ii. fifrs. !», 10. 

 PsiloKfovium redactum, sp, n., Nicull, Ann. & Mag. Nat. Ilist. (7) 



xvii. p. i)2'), pi. xiii. ii<jrs. 9, 10. 



This is a species uliicli Odliner regards as -wrongly 

 identified bv Oisson *, although the latter had some doubt 

 on the matter himself. Olsson assigned his specimens to 

 Distoma simplex, Rud., and was followed by Levinsen and 

 Linton, odhner, by elucidating the structure of Distomum 

 alomon, Rud., shows that they ought really to \\i\\e been 

 assigned to this species. lie also includes Distomum re- 

 Jlexiim, Creplin, under this species, although he excludes the 

 forms which Olsson f and Zschokke J identified as such. 

 As Psilostomvm redactum I described what I considered to 

 be a distinct species, but T must now regard it as identical 

 Avith Podoriityie atomon, Rud. 



Of Rudol[)hi's Distoma simplex (= Fasciola (rr/lefiney 

 !M idler) no specimens remain, so that Odhner regards the 

 species as unidentifiable. He omits notice of the fact that 

 A'an Benedcn § found in Gudus (Pylefiiuis \\\\ni lie apparently 

 regarded as Distomum eeglejine, Miillcr. Van Benedcn is 

 slightly confusing, for while he marks the form ^' sp. nov." 

 in his notes, without any attempt at description, the accom- 

 panying figure is maikcd D. aylcfme, Midler, and we may 

 supjjo^e that this Avas his real intention. Von Linstow || 

 notes both D. simplex, Rud., and D. aykjine, van Bcneden, 

 imder Gadus (pylejinus, so that he was either misled by van 

 13cneden or he regarded the two species as distinct. Stossich^ 

 falls into the same error. Van Beneden's figure is meagre, 

 but, so far as it goes, exhibits a certain resemblance to the 

 form we are here dealing with. The large elliptical ventral 

 sucker, the position of the genital aperture, the male genital 



♦ " Entozoa iaktt hos Skaadinavi^ka Lafsfiskar,"' in Lunda Univ. 



Arsskrift, iv. p. 34, pi. iv. figs. 81, 82. 



t Lunds I'niv. Arsskrift, iv. (8) p. 52. 



t Verhandl. (iesell. liasel, Thl. H, Hit. 3, p. 789, pi. xi. fig. 1. 

 § •' roi.-snu3 dt's Cotes de Bt,lt:ique," p. 5(5, pi. iv. fig. 14, in M<5iu. 

 Acatl. Koy. Ut-lp-. x.vxviii. 



11 C'ompend. d. Helniinthol. p. 230. 

 ^ Diet. d. Pesci, p. 61. 



