F.ntozoa of British Marine Fiahef, 85 



vvlgaris, Gadus (pglcfiitus, and AnunodiiU's tuhianus. Troiu 

 the first three Dislomitm oppendicKlaluin, RiuL, lias already 

 been recorded, but, as Liilie points out, identification has 

 in mnny cases been totally erroneous. Each of tlie four 

 varieties which I have examined aj^rcc well ciiouj:^h on 

 superficial inspection with the accepted idea of Distomum 

 apiu'iidiciilalum, Rud., but on closer investigation they are 

 found to differ each from the other to a greater or less 

 degree and all from Liiiic's amended definition* of Heiniurus 

 appciidicululiis, lind.; they ap[)r()aeh more neatly to H. Sfos- 

 sicliii (Montic), Liihe f. The chief features of dilTcrence 

 between the aljovc-mentioncd varieties are the situation of 

 the testes and the length of the pars prostatica and con- 

 sequent position of the seminal vesicle. In these respects 

 the examples from the haddock, sand-eel, and halibut agree 

 closely with each other and diiTcr markedly from the herring 

 specimens. We must therefore regard the former as distinct 

 from the latter. To fully reconcile either with already 

 existing descriptions and in particular with the definitions 

 of Liihe is impossible. For the present, however, I shall 

 include the specimens from Clupea harenyus under Hemiurus 

 Liilie'i, Odhner, while those from Ammodijtes tobianus are 

 noticed under Hemiurus communis, Odhner. 



Hemiurus Liihci, Odhner [ = //". Stossichii (Montic), Liihe]. 



From the stomach and cajcnm of Clupea harenrjus. 



The already recorded host of this form is Clupea pilchardus, 

 and the fact that this fish is a member of the same family as 

 the herring strengthens the probability that the forms from 

 both are identical. Without attempting a full description 

 of the species I shall endeavour to make clear wherein my 

 specimens dilTcr from Liihe's definition. 



Its occurrence in the herring was frecjuent and in gi-eat 

 numbers, and it was the only intestinal parasite to be met 

 with. The body is very much elongated. The length, 

 including the extended appendix, is 2'70-414 mm. Of this 

 the appendix comprises aljout l-\ {i. e. the appendix = |-.i of 

 the rest of the body). The breadth was measured at two 

 ])oints, (1) just behind the ventral suckers, {2) immediately 

 in frc)nt oi the api)cn(lix ; it was found remarkably constant, 

 viz. '2S-'Sli mm. x ■So-40 ram., representing a somewhat 

 more attenuate condition than Liihe admits in H. Stossic/iii. 

 The length of the neck (taken as the distance between the 



• Zool. .\n7.eig. xxiv. p. 300. t Thid. p. 3PS. 



