Fishes of the Western North Atlantic 537 



from anterior margin of first dorsal fin, 

 its posterior free surface with a longitudi- 

 nal groove, each margin of the latter with 

 a row of small sharp thornlets directed 

 downward; apex of first dorsal angular. 



I I a. Caudal filament not longer than 



distance from tip of snout to external 



gill opening. 



ogilbyi (Waite) 1898." 



Southern Australia, Tasmania, Japan; also 



tsengi (Fang and Wang) 1932, China. 



I I b. Caudal filament at least as long as 



distance from tip of snout to origin 

 of pelvic fins, or longer. 

 12 a. Pectoral fin about 1.5 times as 

 long as head from tip of snout 

 to upper origin of pectoral; 

 oral canal meets jugular canal 

 some distance below point 

 where latter meets orbital canal . 

 13 a. Tips of pectorals reach- 

 ing beyond origins of 

 pelvics when laid back; 

 dorsal spine only about 

 3/4 as long as distance 

 from tip of snout to gill 

 opening; lateral line with 

 a pronounced wave below 

 dorsal spine. 



alberti Bigelow and 

 Schroeder 1951, 



P- 545- 

 13 b. Tips of pectorals falling 

 short of origins of pel- 

 vics when laid back; 

 dorsal spine as long as 



73. Prelim. Rep. 'Thetis,' 1898: 41, pi. 11. According to the two most detailed descriptions of this species (Waite, 

 Mem. Aust. Mus., 4, 1899: 48, pi. 8; Tanaka, J. Coll. Sci. Tokyo, 23, 1908: 12), the caudal filament is at least 

 as long as the distance from the tip of the snout to the rear edge of the eye; but the caudal has been characterized 

 more recently as "hardly filamentous" (Whitley, Fish. Aust., I, 1940: 233). In tsengi Fang and Wang (Contr. biol. 

 Lab. Sci. Soc. China, 8, 1932: 2S1, fig. 29), the caudal filament, while described as long, is pictured as somewhat 

 shorter than the distance from the tip of the snout to the gill openings. H. tsengi closely resembles H. ogilbyi, ex- 

 cept that it is described as hght brown (in formalin), not silvery. We hesitate to judge from the published accounts 

 whether it is actually distinguishable from ogilbyi. 



