324 Memoir Sears Foundation for Marine Research 



of 1st dorsal about i Vs times as long as snout in front 

 of mouth J anterior margin of nostril with low, sub- 

 triangular lobe. 



springeri Bigelow and Schroeder, 1 944, p. 404. 



7b. Origin of ist dorsal over axil of pectoral, its vertical height 



(after birth) at least as great as distance from eye to 3rd 



gill opening} dermal denticles loosely spaced, without well 



marked teeth, milberti Miiller and Henle, 1 841, p. 368. 



3b. Midline of back between dorsals smooth, without dermal ridge. 



9a. Apex of 1st dorsal very broadly rounded j tip of anal reaches nearly 



to origin of caudal. longimanus Poey, 1 8 6 1 , p. 3 54.°' 



9b. Apex of 1st dorsal subangular or narrowly rounded; tip of anal 



separated from origin of caudal by a distance at least as long as 



diameter of eye. 



loa. Snout, in front of line connecting outer ends of nostrils, less 

 than ^ as long as distance between inner ends of nostrils. 

 I la. Anterior margin of eye opposite or a little anterior to 

 front of mouth; ist gill opening not more than ^2 as 

 long as distance between nostrils. 



leucas Miiller and Henle, 1841, p. 337. 

 lib. Anterior margin of eye a little posterior to front of 

 mouth; ist gill opening nearly % as long as distance 

 between nostrils. 



nicaraguensis Gill and Bransford, 1877, p. 378. 

 lob. Snout, in front of a line connecting outer ends of nostrils, at 

 least % as long as distance between inner ends of nostrils. 

 1 2a. Upper teeth strongly asymmetrical, their outer margins 

 deeply concave in subangular contour (notched). 



acronotus Poey, i860, p. 325. 

 12b. Upper teeth along inner half of jaw erect, nearly sym- 

 metrical, their outer margins not much more concave 

 than the inner, if at all. 



13a. First gill opening not more than 1.5 times as long 

 as horizontal diameter of eye; lower precaudal pit 

 only faintly indicated; fins without conspicuous 

 black markings; anterior margin of nostril con- 

 spicuously lobed (Fig. 76 F). 



remotus Dumeril, 1865, P- 400. 



5a. Longimanus is included under alternative 3b, as well as under 3a, because of uncertainty as to whether or not the 

 mid-dorsal ridge, evident in embryos, persists after birth. 



