540 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 57. 



he describes a second species, M, ovatus (fig. 7). This paper is in 

 Japanese. A brief summary is given in German, in which it appears 

 that M. ovatus differs from M. yokogawai in being oval in shape and 

 smaller in size. These differences, in the opinion of the present 

 writer, are insuflficient to justify the separation of the two forms, and 

 M. ovatus accordingly has been listed among the synonyms of M. 

 yokogawai. It is not evident from what species of host animal M. 

 ovatus was obtained. Presumably it was found in Japan. 



Ciurea (1915) without knowledge of Yokogawa's work described 

 the genus Loossia with three species based on flukes occurring in Rou- 



<SK.,_ 



yr^.. 



Fig. 7.— Metagonimus ovatus (=M. yokogawai). Ventral view, x ?• After tokogawa, 1913. 

 [For explanation of lettering see footnote, p. 532.] 



mania. In a later article (1915) he called attention to the close re- 

 semblance between Loossia and Metagonimus and the possible identity 

 of the two genera, although he considered it questionable whether 

 both should not be recognized in view of certain discrepancies be- 

 tween Yokogawa's description and his own findings. In the present 

 writer's opinion, however, the two genera are not distinguishable, 

 and furthermore it does not appear that in practice the various 

 species that have been described could be distinguished from one 

 another. 



