252 Gr. A. aud W. G. MacCallum, 



in width. The neck is rather short and merges into the wider part 

 of the body which supports the large ventral sucking diso. The 

 hinder part of the body is relatively long, cylindrical in form and 

 usiially found somewhat curved ventrally in dead specimens. 



The anterior end flares gracefully out into a flower like or 

 trumpet shaped ring of five curved "lips" which are nearly equal 

 in size. In the center of these is the unarmed oral opening. Ven- 

 trally the neck is sharply marked off from the sucking disc and in 

 the angle there lies in the median line the genital opening. 



The sucking disc which measures 1,75 >;. 80 mm occupies a little 

 more than the second quarter of the bod}^ It is elliptical in form 

 and subdivided longitudinally by three ridges one of which occupies 

 the mid line while the otlier two curve outward as shown in the 

 Sketch so as to leave the marginal depressions rather short trans- 

 versely. There are fourteen or fifteen of them in each row, This 

 has not the appearance of being an extremely strong sucking 

 apparatus. Indeed the whole musculature of the body is rather 

 sparingly developed and the worm is flaccid and by no means so 

 stiff and firm as is the case in Äspidogaster ringens. 



The posterior part of the body is somewhat club shaped, and 

 in the hinder end, as well as in the dorsal portion, up to the level 

 of the sucking disc, coils of uterus filled with eggs can be seen. The 

 blackish Clusters of the yolk gland can be seen ranged along the sides 

 and extending into a position near the center of the body above 

 the ventral sucking disc. 



Further details could be made out only upon section. One of 

 the Worms cut sagitally into serial, sections gave very clearly the 

 whole anatomy. 



The mouth is quite unarmed and is merely a funnel shaped 

 opening surrounded by five petal like subdivisions of the anterior 

 end of the body. These are not sucker like in their arrangement 

 but have a much reinforced musculature, the most bulky part of 

 which has its fibres vertically placed to the oral surface while there 

 are other far more delicate fibres lying parallel to these surfaces 

 and Crossing one another. Posteriorly the main muscular fibres 

 merge into those of the body and it is found that the anterior part 

 of the body is, in comparison with the remainder, very abundantly 

 supplied with strong muscular fibres. It seems possible that the 

 whole perioral arrangement connected as it is with the musculature 



