Fishes of the IVestern North Atlantic 54.5 



Chimaera abbreviata Gill, Proc. U. S. nat. Mus., 6, 1883 : 254 (descr., Lat. 4o°i7' N, Long. 66°58' W, 1,200 



fath.). 

 Psychichthys affinis Jordan, Evermann and Clark, Rep. U. S. Comm. Fish. (1928), 2, 1930: 33 (listed, C. Cod 



to Portugal); MacCoy, Bull. Boston Soc. nat. Hist., 58, 1931: 17 (same specimen as Firth 1931). 

 Bathyopolex abbreviatus Jordan, Evermann and Clark, Rep. U. S. Comm. Fish. (1928), 2, 1930: 33 (listed, 



by ref. to Gill 1883). 

 Bathyopolex plumbeus Jordan, Evermann and Clark, Rep. U. S. Comm. Fish. (1928), 2, 1930: 33 (hsted). 

 Chimaera monstrosa Vladykov and McKenzie, Proc. N. S. Inst. Sci., ig, 1935: 52 (listed, Nova Scotian Banks, 



by ref. to Bean 1880, Chimaera plumbea, and Goode and Bean 1895). 

 Not Chimaera monstrosa Linnaeus 1758. 



Hydrolagus alberti Bigelow and Shroeder 1951 

 Figure 121a 



Study Material. Immature male, 275 mm long to origin of upper caudal fin, 

 holotype (U. S. Nat. Mus. No. i 53588); male, 280 mm, and female, 275 mm, para- 

 types (U.S. Nat. Mus. No. 153559); all from Lat. 29°! i' N, Long. 86° 52' W, 305 

 fathoms, Oregon St. 279. 



Distinctive Characters. This newly discovered chimaerid is marked off from its 

 genus mate affinis by its long caudal filament, its relatively much longer pectorals and 

 by its much larger eyes. It resembles the Japanese H. mitsukurii closely but differs from 

 it in having a shorter dorsal spine, longer pectorals, and a more conspicuously wavy 

 lateral line anteriorly. 



Description of holotype: Proportional dimensions in per cent of distance between 

 snout and origin of upper caudal fin. Immature male, 275 mm long to origin of upper 

 caudal fin (U. S. Nat. Mus., No. 153588). 



Trunk: breadth 10.9; height 15.6. 



Snout length: in front of eye 9.5; in front of mouth 10.5. 



B.ye: horizontal diameter 7.6; vertical diameter 5.8. 



Mouth: breadth i^.c^. 



Nostrils: distance between 0.4. 



Dorsal spine: length 15.3. 



First dorsal fin: length of base to lowest point between dorsals 13.8. 



Second dorsal fin: length of base 64.7, 



Upper caudal fin:^^ length of base to last horny ray 19.3. 



Pectoral fin: length 31.6; breadth 16.3. 



Distance from snout to: origin of dorsal spine 24.4; 2nd dorsal 38.2; pectorals 

 23.2 ; pelvics 45.5. 



Distance from origin to origin of: pectorals and pelvics 26.6. 



Trunk opposite dorsal spine about as high as distance from snout to posterior 

 margin of eye; about half as high close behind pelvics, tapering evenly thence rear- 

 ward and terminating in a long filament which, when complete, is about 2/3 the length 



93. The point of origin of the lower caudal fin is not evident. 



35 



