NOTES o\ JAPANESE MYXINOIDS. 1 ;, 



given in PI. L, Figs. 3 and I. give a good idea of its external char- 

 acters : also in Text-fig. 2 of its proportional measurements in terms 

 of other species. Its " teeth " are shown in Text-fig - . 3 A. And in 

 Text-fig. 4 C a diagram indicates the relations of the branchial ducts 

 and the afferent vessels. Its egg is figured in PL I, Fig. 5, and the 

 arrangement of its anchor-filaments at either pole is shown in Text- 

 fig. 1 J/, N. hi this myxinoid the pointed shape of the head and 

 the close approximation of the external gill openings suggest closely 

 Myxine. 



IV1YXINE GARIYIANI, Jokdan and Snyder. 



All specimens of this species recorded were taken in the neigh- 

 borhood of the mouth of the bay of Tokyo. The most famous 

 Myxine ground appears to be the one situated in Outside Okinosé. 

 It is from this region, or near it, that the specimens of the Challenger 

 were obtained. I have received five specimens from this region, of 

 which three were immature, measuring about 35 cm. in length. 

 The species is a large one, its adult averaging about 50 cm. Its 

 color is dark indigo purple, somewhat bright in tone. 



In distinguishing this species from M. austrails Jenyns, to 

 which Günther referred it, I add to the reasons adduced by Jordan 

 and Synder the following : — 



It is a larger species, its dental cusps are more numerous and 

 the base of the tongue muscles extends further tail ward than the first 

 pair of gills. The more median dental cusps fuse as in the southern 

 Pacific species, but they are smaller than the more lateral ones. A 

 more definite comparison of the normal of this species with the 

 normal of the southern Pacific one, may render it advisable to regard 

 the Japanese form as a variety of M. austrails, but the differences as 

 above pointed out, viewed in connection with the emphatic geographic- 



