BY W. A. HAS WELL. 51 



ventral surface some little distance from the margin, but mani- 

 festly on the summit of the papilla. 



If we accept Lonnberg's account of the position of these 

 apertures in G. urna, there would appear to be a sufficiently 

 strongly-marked difterence in this respect between that species 

 and G. ruyosa. In the former the male aperture is ventral, 

 situated towards the middle line, and the vaginal aperture is 

 always in front of it on the dorsal surface. In the latter the 

 male aperture is ventral, but marginal or sub-marginal; and the 

 female dorsal, somewhat to the right of the middle, and a little 

 behind the male. A further external difference between the two 

 forms concerns the cirrus. 



In the specimen of G. ruyosa in my possession (figs. 3, 4 and 5) 

 this is a prominent process, conical in shape, its base situated on 

 the ventral side between the middle line and the right margin of 

 the body. It is strongly curved round towards the dorsal side, 

 lying in a deep notch in the right border, its apex actually 

 projecting on the dorsal side of the body. From the appearance 

 presented it is obvious that the specimen has been killed with the 

 parts approximately in the position for self-impregnation, the 

 apex of the penis being approximated towards the vaginal 

 aperture on the dorsal side. There is no evidence of the 

 occurrence of any such arrangement in G. urna. On the contrary, 

 L'Jnnberg states very positively "Da die beiden Genitaloffnungen 

 auf verschiedenen Korperfliichen liegen ist natiirlich Selbstbe- 

 frachtung ganz unmoglich bei diesen Cestoden, und auch 

 Wechselkreuzung sehr schwierig " (4, p. 40). 



The parasite of Chimcera Ogilhyi (fig. 1) is more nearly allied 

 to G. urna than to G. rugosa. How far the slight differences 

 between it and the northern species are of a constant character 

 can only be determined by comparison of large series ; in t)ie 

 meantime I refer to it as G. nigrosetosa. 



The two specimens, which are both large (about 70 mm. in 

 length), resemble one another in most respects. The}^ both have 

 richly plaited borders and a "funnel" with greatly folded walls. 

 The anterior sucker resembles that of G. urna. 



