GILBERT AND STAHKS— FISHES OF PANAMA KAV 11 



tliL- tfftli in adults. Ttvlli in npjKT jaw Imiadly triani;iilar, in (runt of jaw iiarrnwi-r and cTi-ct, those in 

 sides of jaw ^rowin); at once broader ami more ol)li((iie. The lateral teeth have a strong notch on the 

 outer side. Both marfjins are stronjfly .serrate, tlie serrations increasinjj t<jwarci biise, one or more of 

 those below notch sometimes enlarijeil and cusp-like in adults. Teeth about sj. 



Cons|)icuous areas of larj^e and of small pores on under siile of head. Gili-o|)eninj.pi of 

 moilerate wiilth, tiie longest equalinj; distance lx;twcen eye and nostril, the fifth much shortened, al)out 

 J ieiij^th of tlrst. Kye small, e(|ualiiii,f lcni;th of nasal oi)eninn, i J to 2 in middle jjill-slit. 



Pectoral short and I )roail, the ])oslerior niarj^in not slronjjly incurved. Tip of fin e.>itendinj; 

 to a vertical intersectinjj tlorsal base at origin of its fX>sterior third or fourth. Anterior margin of pec- 

 toral T, times length of inner or posterior margin, the latter less than width of base. First dorsal 

 begiiuiing biiiind a vertical from a.\il of jx-ctorals a distance about eciualing that which separates eye 

 from nostril. I'ree margin of tin gently concave, the anterior angle extending to a point midway 

 between base and tip of |3osterior lobe, when the fin is (ie|iressed. Hase of first dorsal 2i to 2^ in 

 inters|)ace ijetween tlorsals. Base of second dorsal 7 in intersjjace between dorsals, 2'j in its distance 

 from anterioi" inart;in of pit. Tlir origin of second dorsal falls over or i)fliin<i middle of anal base. 

 The fin is but slightly concave, with rounded anterior angle; its posterior angle much |)roduced; the 

 |)osterior margin e.xceeiling ba.se of fin, which about e(|uals length of anterior margin. Anal inserted 

 more anteriorly than second dorsal, its base longer, its margin much more deeply concave, the length 

 of basi' contained about li limes in its distance from lower caudal lobe. Lower caudal pit in advance 

 of the up])er. The cautlal is broad throughout, the lower lobe not falcate, slightly less ( ,'(, to J ) than 

 half length of upper lobe, which is about 4 J in total !inu;th. .Shagreen coarse. 



Color varying from light to dark gray above, the i)elly and lower part of sides wliitish. Fins 

 all dusky or grayish, the caudal often with a l)lackish border. Pectorals with or without a black tip, 

 the latter when present not as conspicuous as in C. crlhalonis, usually not extended onto inner face of 

 fin. A specimen 73 cm. long has the claspers undeveloped, extending slightly beyond margin of 

 ventrals. Another s])eciinen, S5 cm. long, has the clas]5ers fully developed, extending beyond the 

 margin of the ventr.ils for ;i distance of 5 cm. 



Al>iiiH];iiit at Panama, where nmncroii.s specimens wofe secured. 



(J. curdale strongly resembles C- ((;(hn/(>nix, with wiiich it is associiited in the 

 Hay of Panama. It is distinguishable at sight by tlie narrower gill-.slits, broader and 

 less falcate fins, and by the mtich less cons|ii('noiis l)lack tips to the pectorals. The 

 dentition is very dissimilar in the two, and makes it necessary to arrange them in 

 different parts of the genus, C. cerdale belonging to the subgenus FlnUjpndon. 



8. Carcharias azureus sp. nov. 



CaZON AZLi-. 



Pi.ATK II, Fh:. 5. 



Snout very short and bluntly rounded, its outline nearly p;irallel with cleft of mouth, the length 

 of its preoral portion i| to i| in distance between angles of mouth, constantly greater than distance 

 from chin to line joining angles of mouth, and very slightly {\ to y'j) less than distance between 

 inner angles of nostrils. Width of snout opposite nostrils equals distance from angle of mouth to first 

 gill-slit. Eye nearer mouth than nostril, nearer nostril than angle of mouth. Outer angle of nostril 

 midway between tip of snout and middle of eye. Eye small, its horizontal diameter J nostril ojjening. 

 Nostrils converging along lines which meet a short distance behind symphysis. The anterior margin 

 is produced into a short, triangular flap. Width of mouth equaling half length of head in front of 

 gill-slits. Gill-slits wide, equaling or slightly exceeding the distance from eye to nostril, about equaling 

 length of branchial area. Two very short diverging furrows visible at angle of mouth, one representing 

 as usual the obsolescent upper lip. 



