yachdrnck verboten, 

 übersetzungsrecht vorbehalten. 



Further notes on the genus Microcotyle. 



By 



G. A. MacCallum, M. D., New York. 



With 4 fignres in the text. 



As stated in a previous paper in this Journal (Vol. 34, 1913, 

 Syst., p. 223), one is impressed in study ing- the Microcotylidae with 

 the lack of variety in the arrangement and form of the internal 

 Organs so that the differentiation of species is dependent largely 

 upon outward differences, Of these the number, form and structure 

 of the caudal suckers and the peculiar armature of spines which 

 often occurs about the genital opening are perhaps the most con- 

 stant and characteristic features, although of course there are many 

 other things which must be taken into consideration in deciding this 

 point. In the table which follows and which is a continuation of 

 that given in the previous paper, it is attempted to give these data 

 as accurately as possible, and it is hoped that this basis for Classi- 

 fication will be adopted by helminthologists in the case of this 

 genus to avoid confusion. 



4 new species are added to the genus as the result of the study of 

 the parasites of the gills of marine fishes obtained partly from the 

 New York Aquarium, partly in the laboratoiy of the U. S. Fish 

 Commission at Woods Hole and partly in the fish markets of New 



