38 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



aa. Snout broadlj' rounded, its preoral length much less than width of mouth; 

 teeth, especially in upper jaw, broadly triangular, all distinctly serrate; 

 origin of second dorsal well in advance of that of anal; no dusky band on 

 sides azureus (p. 39) 



EULAMIA AETHOLORUS (Jordan and Gilbert) 



Caz6n; Caz6n de leche 



Carcharias aetholorus Jordan and Gilbert, 1882d, p. 104, MazatMn, Mexico 

 (original description). 



Carcharinus limbaius Nichols and Murphy (probably not of Miiller and Henle; 

 record based on jaws only), 1922, p. 504, I.obos de Tierra Island, Peru. 



Eulamia limhata Fowler (probably not of Miiller and Henle), 1941b, p. 224 (refer- 

 ences; range, given as including the Pacific, Atlantic, and Indian Oceans), 



Eulamia aetholorus Beebe and Tee-Van, 1941, p. 106 (range; field characters; 

 size; breeding; references). 



Body moderately robust, its depth at origin of dorsal 3.4 to 3.6 in 

 length anterior to base of upper lobe of caudal; caudal peduncle only 

 moderately slender, its least depth 4.8 to 5.5 in head to first gill slit; 

 head much depressed, its depth over eyes less than width of mouth by 

 about half diameter of eye, its length to first gill slit 3.4 to 3.7 in length 

 anterior to base of upper lobe of caudal; snout with rather narrowly 

 rounded anterior margin, 2.4 to 2.5 in head, its preoral length about 

 equal to width of mouth, 2.75 to 2.85 in head; eye nearly round, with a 

 vertically elongate pupil, 9.25 to 9.8 in head; mouth moderately wide, 

 distance between its angles exceeding internarial space by width of 

 one nostril, 2.55 to 2.75 in head; labial folds represented by a short 

 slit in upper lip very near angle of mouth; first dorsal originating 

 som.ewhat behind midlength of pectoral, its greatest height about 

 equal to width of head at eyes, its distal margin concave, with a very 

 small, somewhat produced posterior lobe; predorsal length 2.1 to 2.25 

 in length anterior to base of upper lobe of caudal; distance between 

 dorsal fins 3.1 to 3.3; second dorsal very small, produced and pointed 

 posteriorly, its origin slightly in advance of middle of base of anal; 

 upper lobe of caudal quite long, 2.75 to 3.0 in length anterior to its 

 base; lower lobe exserted anteriorly, nearly as high as first dorsal; anal 

 somewhat larger than second dorsal, its margin deeply concave, its 

 base 5.0 to 6.0 in head; ventral moderate, inserted rather nearer tip of 

 pectoral than origin of anal, its distal margin nearly straight; pectoral 

 long, fairly pointed, with concave distal margin, inserted under fourth 

 gill slit, its greatest length 4.3 to 4.7 in length anterior to base of upper 

 lobe of caudal. 



Color bluish gray above, pale below; side with a slight dusky band, 

 extending backward from above and behind pectoral, partly enclosing 

 a longitudinal pale area; vertical fins, exclusive of the anal, somewhat 

 lighter gray than the back ; pectoral quite dark above, pale underneath, 

 the tip rather abruptly dark; anal and ventral only slightly dusky. 



The foregoing description is based on 3 embryos in the collection, 

 respectively 510, 533, and 550 mm. long, which with 20 others were 



