Fishes of the Western North Atlantic 



547 



of second dorsal about -/s as long as anterior margin of first dorsal. Second dorsal with 

 horny rays easily distinguishable; upper margin nearly straight; height at midlength 

 about Vs as great as length of anterior margin of first dorsal ; about equally great at 

 rear end and slightly greater toward anterior end; posterior outline of second dorsal 

 curving abruptly downward. No definite interspace between second dorsal and upper 



Figure 121a. HyJrolagus alberti, holotype, male, 275 mm long to origin of upper caudal fin, from offing of 

 Pensacola, Florida, Lat. 29°! i' N, Long. 86°52' W (U. S. Nat. Mus., No. i 53588). A Posterior part of second 

 dorsal fin and upper and lower caudal fins, about I X . 5 Ventral view of head and body. C Mouth, with left lip 

 folded aside to show nostrils and dental plates, about r.3 X. D Tip of dorsal spine, about 2.6 X. 



origin of caudal. Caudal lanceolate, prolonged into a long filament about ^/j as long as 

 distance from snout to rear end of second dorsal ; maximum height of caudal above axis 

 ^3 of height of second dorsal at posterior end; its extreme length to most posterior ray 

 about nine times as great as its height; caudal below axis about Vs as wide as above; 

 the most posterior rays of both upper and lower sides of caudal ending almost impercep- 

 tibly and about opposite each other; origin of lower side of caudal indefinite in position, 



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