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OnAspidogaster ringens (LiDton) and A:kemostoman.sp. 



By 



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



From tlie Department of Patholog}" Columbia University. 



With 4 figures in the text. 



In the family Aspidohothridae the determination of g-enera has 

 heen made chiefly upon the character of the ventral sucking disc, 

 the presence or absence of tactile organs in the margins of this 

 disc and the number of festes. The forms which we have to de- 

 scribe fall therefore, as will be seen, into the genus Aspidogaster, 

 although in A. ringens the median ridge of the sucking disc is so 

 ill developed that the disc has rather the appearance of that seen 

 in Cotylogaster. Still the existence of only one testis seems a cha- 

 racter of much greater specific importance and since some of the 

 specimens show a median ridge though imperfectly developed, we 

 have not hesitated to place the form in the genus Aspidogaster. 



Aspidogaster ringens (Linton). 

 (Fig. A.) 



Very numerous specimens of this form were found in the in- 

 itestines of Trachinotus carolinus varying greatly in size and in the 

 Proportion of their bodies. Probably this is due chiefly to the 

 «condition of contraction, for one has the Impression from the fixed 



