MJL 24 1911 



On a New Species of Frog Trematode 



(Enodiotrema rugocaudatum n. sp.) 



By 



Sadao Yoshida. 



Pathological Pepartmcnt, Osaka Medical Academy. 

 With Plate II. 



Specimens of the new distome to be described in this paper were 

 taken by me from the common frog, Rana nigromaculata Hallowel, on 

 several occasions during September and October of year before last. Frogs 

 infested with the parasite seem to be of pretty common occurrence in the 

 neighborhood of Osaka. It is found in parts of intestine following the 

 stomach, in a number of from one to eight or more at a time. 



External features. 



We have here to do with small, up to 3.2 mm. long, worms of a light 

 yellowish color, excepting the parts occupied by the egg-filled uterus 

 which presents as usual a dark brownish color. The body may be said to 

 be in general of an elongate ovoid shape, somewhat flattened dorso- 

 ventrally, broadest between the middle and posterior thirds of body-length, 

 and rounded at both extremities. During life the worm is actively mobile 

 in the anterior parts, which are now prolonged forwards and then 

 withdrawn, while the posterior parts remain nearly the same in shape and 

 bulk. Figs. I and 2, Pl. II, serve to show the extent of change in outline 

 of the anterior body-end, which in the contracted state may take the shape 

 and position indicated by the dotted line in those figures. A worm 

 1.6 mm. long in the contracted state was observed to stretch out to a 

 length of 2.12 mm., and another from 1.7 mm. to 2.44 mm., in both cases 



