Jordan a/id Everniaiiii. — Fishes of North America. ;j9 



49. CABCHARiriNUS PLATYODON, (Poey). 



Body Stout ; head very short, broad, depressed, and bluntly rounded; 

 mouth twice as broad as long, its breadth about \ more than length of 

 snout; upper teeth very broad, triangular, erect, coarsely serrate, not 

 notched; lower teeth narrower, more finely serrate. First dorsal begin- 

 ning close behind pectoral, a little higher than long, not falcate, its base 

 2Hn interspace between dorsals; second dorsal very small, its base 5 

 in interspace; caudal moderate, 2j in body; anal a little longer than 

 second dorsal, and placed a little farther back; pectorals rather small, 

 not falcate, 6 in total length, reaching a little past front of dorsal ; width 

 of pectoral nearly | of its length. Slaty blue, white below ; caudal 

 blackish, other fins with dark tips. L. 10 to 1.5 feet. Cuba to Texas; 

 abundant in the Gulf of Mexico; the specimen here described being from 

 Galveston. (TrAari'f, broad ; odoiV, tooth.) 



Sqtiahis 2'tat!inflon, PnEY, Memorias, ii, 331, 1861, Havana. 



Sqiialm ohtusus, Poey, 1. c, 337, Havana. 



Carcliarias plalijodon, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1882, 243 ; Synopsis, 872,1883. 



50. CARCHABHINUS FBONTO, (Jordan k Gilbert). 



(TlBURON.) 



Body short and stout; head very broad, depressed, broadly rounded 

 anteriorly, the front of snout parallel with cleft of mouth ; snout from 

 mouth i the distance between angles of mouth ; and about equal to 

 distance from chin to the line connecting these angles; interorbital 

 width twice length of snout to eyes. Teeth in both jaws narrowly trian- 

 gular, twice as high as broad, all nearly erect and scarcely notched on 

 outer margin. Free margins of fins concave ; insertion of first dorsal 

 nearer pectorals than ventrals; length of base of first dorsal more than 

 its height, but less than interorbital width ; interspace between dorsals 

 2J times base of first, 3.^ times base of second ; tail 4i in body ; anal 

 smaller than second dorsal ; pectorals large, not acute, reaching a little 

 past front of dorsal. Slaty gray, the edges of fins brownish. L. 10 feet. 

 Pacific Coast of Mexico ; a large voracious shark remarkable for its broad 

 bead, (fronto, having a wide forehead.) 



Oarchnrias fronin, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1882, 102, Mazatlan, Mexico. 

 (Type, No. 28167.) 



51. CARCHABHINUS NICARAGUENSIS, (Gill & Bransford). 



(TiGRONE.) 



Snout short, ol)tusely rounded ; distance from mouth to snout ,^ distance 

 between nostrils ; teeth If ; upper teeth triangular, scarcely notched on 

 outer margin ; first dorsal commencing just behind axil of pectoral, its 

 height greater than length of its base; second dorsal larger than anal, 

 its base 2^ in that of first dorsal; pectorals moderate, their length not 

 twice height of dorsal. L. 7 feet. Lake Nicaragua and its outlet, Rio 

 San Juan, abundant, confined so far as known to fresh Avaters, the only 

 strictly fresh water shark recorded. 



Eulamia nimragiii'iiiiis, Gill & Bransford, Proc. Ac. Nat. Sci. Phila., 1877, I'JO, Lake Nica- 

 ragua, Nicaragua. 



