Nachdruck vei-boteyi. 

 Ubersetzungsrecht vorbehalten. 



Four species of Microcotyle, 

 M. pyragraphorus, macroura, eueides and acanthophallus. 



By 



G. A. MacCalluni, M. D. and W. G. MacCallum, M.D., New York. 

 (Frorn the Department of Pathology, Columbia University.) 



With 10 flgnres in the text. 



No very satisfactory study of the genus Microcotyle has been 

 made so far, the literature on these parasites of the gills of marine 

 fishes being limited to a few publications in which Classification has 

 been attempted from different points of view, so that the characters 

 emphasized by one author as of chief specific importance are 

 somewhat neglected by another. Though we add four new specific 

 names to this genus, we do so after having carefully reviewed all 

 of the forms already described, none of which seem to agree at all 

 closely with those in our hands. The analytical table which will 

 serve to give a general survey of all these species has been copied 

 in part from Parona & Perugia ^) and in part made up from the 

 papers of Goto -), Vogt ^), Lorenz ^) and Ariola.^) It will be seen 



1) Parona e Perugia, in: Ann. Mus. civ. Stör, nat, Genova, 

 1890—1891, Vol. 10, p. 173. 



2) Goto, in: Journ. Coli. Sc. Fniv. Tokyo, 1894, Vol. 8, p. 1—273 ; 

 1899, Vol. 12, p. 263. 



3) Vogt, in: Z. wiss. Zool., Vol. 30, Suppl. 



4) Lorenz, in: Arb. zool. Inst. Wien, 1878, Vol. 1, p. 405. 



5) Ariola, in : Boll. Mus. Zool. Anat. comp. Genova. 



Zool. Jahrb. XXXIV. Abt. f. Syst. 16 



