396 Mr. C. T. Regan— .4 Revision of the 



3 most anterior ones united ; 10 or 11 teeth in the second 

 series, the 2 most anterior ones united. Pores 26-27 + 57- 

 61+ 12-13. Length of head 3| in the total length. 

 Japan. 



1-3. 310-620 mm. Hyalonema Ground, Sio fath. * ChuUeriger.' 



2. Myxine triden tiger. 



Mi/xme australis (part.), Giiutli. Cat. Fish. viii. p. 511 (1870) ; 'Chal- 

 lenger' Deep-sea Fish. p. 267 (1887). 



Myxine tridentiger, Garman, Mem. Mus. Comp. Zool. xxvi. 1899, 

 p. 345. 



6 brancliial pouches. 10 teeth in eacli series, tlie 3 most 

 anterior in the first series and the 2 most anterior in the 

 second series united. Pores 2'2 + 62 + 9. Length of head 3| 

 in the total length. Left branchial aperture widely separated 

 from that of the oesophageal duct. 



Straits of Magellan. 



1. 460 mm. (type of the species). Sandy Point. Dr. Cunningham. 



3. Myxine circifrons. 



Myxine circifrons, Garman, Mem. Mus. Comp. Zool. xxvi. 1899, p. 344, 

 pi. Ixviii. figs. 1-4. 



5 branchial pouches. 13 teeth in the first series, the 3 

 most anterior united ; 11 teeth in the second series, the 

 2 most anterior united. Pores 21-23 + 59 + 11. Length of 

 head a little less than ^ of the total length. 



Total length 470 mm. 



7° 30' 36" N., 78" 39' W., 730 fathoms. 



4. Myxine paucidens, sp. n. 



6 branchial pouches. 6 teeth in the first series and 7 in 

 the second; the 2 most anterior teeth of each series united. 

 Pores 26 + 53-57 + 10. Length of head 3| in the total 

 length. 



Japan. 



1-2. 240 & 305 mm. JSyalonema Ground, 345 fath. ' Challenger.' 

 (types). 



