344 



DEEP SEA FISHES. 



Anterior 3 teeth confluent in each upper series ; 



teeth in upper series 13 ; gills 5 circifrons 



teeth in upper series 10-11 ; gills 6 trideniiger 



Anterior 2 teeth confluent in each upper series ; gills 6 ; 

 teeth in upper series 10 (10-11 ) ; pectoral pores 28-32 ; 



abdominal pores 63-68 austraUs 



teeth in upper series 9 (8-10); pectoral pores 27-30; 



abdominal pores 62-70 Umosa 



teeth in upper series 9(8-9); pectoral pores 32-34 ; 



abdominal pores 58-59 acutifrons 



teeth in upper series 8 (7-9) ; pectoral pores 25-28 ; 



abdominal pores 53-57 ghdbiosa 



Myxine circifrons sp. n. 



Plate LXVIIlfigs. 1-^. 



Body moderately stout, depth about one eighteenth of the total length, 

 form rather narrow and pointed at the snout, much compressed at the tail. 

 From the head to the gill opening is five sixteenths, and the length of the 

 tail is less than one eighth of the entire length. Labrum, between the ante- 

 rior narial barbels, broad and rounded, as in Homea polytrema Gir. Nasal 

 barbels well developed, upper but little the shorter. Buccal barbels promi- 

 nent, inner pair short, outer pair strong and longer than the rostral barbels. 

 Teeth in each of the upper series thirteen, the anterior three of which are 

 confluent in their bases; teeth in each of the inner series eleven, the ante- 

 rior two of which are united by their bases. Gill openings small, at nearly 

 one third of the distance from the snout to the end of the tail. Gills five. 

 In respect to the number of gills this species differs from the others of the 

 genus most prominently. As in those species, the anterior two of the gills 

 lie against the side of the posterior extremity of the massive tongue-muscle. 

 Pectoral pores twenty-one to twenty-three ; abdominal pores fifty-nine ; 

 caudal pores eleven. Dorsal and anal fins moderately deep, caudal broadly 

 rounded on the posterior margin. Middle of dorsal fin in advance of the 

 vent, the fin rising gradually from the origin and becoming as deep as the 

 muscular portion of the tail in the posterior one third of the latter. Anal 

 as deep as the dorsal. Fin rays, D. 89, A. 42. Muscular segments of the 



