NOTES ON JAPAN KSK M Y X I NOIDS. 13 



are situated somewhat further forward than in IL bürgert. I note 

 that a well marked median ventral "fin" is present, ami that the 

 dorsal unfold is restricted to the region of the tail tip.* The dental 

 formula in two specimens was 44- 1 t4 of the third f£ [ -fi. The more 

 median teeth on either side are confluent at their bases, three of the 

 outer and two of the inner rows. (Cf. Text-fig. 3 B). The base of 

 the tongue extends backward between the second and third pairs of 

 branchial sacs ; the afferent artery, however, divides opposite the 

 seventh pair. The lateral mucous pores are dark-colored and 

 inconspicuous. The color of the present species is dark purplish 

 brown. 



In the female specimen above referred to the ovary contains 44 

 eggs. These are in a late stage of development and enable us to 

 determine with reasonable accuracy the size of the egg at maturity 

 together with the number of the anchor filaments. I find, accord- 

 ingly-, that the length of the egg averages 35 mm., its diameter 12 

 mm., its general shape and its actual length being indicated in PL I, 

 Fig. 2. In two specimens examined by Mr. Naohidé Yatsu, who 

 kindly prepared Text-Fig. 1, p. 9, the number of filaments at the 

 animal pole were 62 and 63 and at the vegetal pole 64 and 74. (Text- 

 fig. 1, I — L). It is possible, however, that the number of filaments in 

 these eggs was not yet completed. The figures indicate that the central 

 ring of filaments surrounding the micropylar funnel (I — J") is of 

 greater diamètre relatively than in other myxinoids described. 



Two of the types are preserved in the Museum of the Science 

 College of the Imperial University of Tokyo, the third in Columbia 

 University, New York City. 



* Tbe anterior extension, of these fins is somewhat variable, depending upon the amount 

 of blood which their sinuses contain. 



