Jordan and Evennann. — Fishes of North America. 2747 



riorly than second dorsal, its base longer, its margin much more deeply 

 concave, the length of base containe<l about 1* times in its distance from 

 lower caudal lobe; lower caudal pit in advance of the upper; caudal 

 broad throughout, the lower lobe not falcate, slightly less ( i^j to \) than 

 I length of upper lobe, which is about 4J: in total length. Shagreen 

 coarse. Color varying from light to dark gray above, the l)elly aud lower 

 part of sides whitish ; tins all dusky or grayish, the caudal often with a 

 blackish border; pectoral with or without a black tip, the latter when 

 present not as conspicuous as in C. (vtlialorus, usually not extended into 

 inner face of fin. A specimen 730 mm. long has the claspers undeveloped, 

 extending slightly beyond margin of ventrals. Another specimen, 850 mm. 

 long, has the claspers fully developed, extending beyond the margin of 

 the ventrals for a distance of 50 mm. Strongly resembling C. athalorus, 

 with which it is associated in the Bay of Pauama. It is distinauishable 

 at sight by the narrower gill slits, broader aud less falcate fins, and by 

 the much less conspicuous black tips to the pectorals. The dentition is 

 very dissimilar in the two, aud makes it necessary to arrange them in 

 different subgenera. Abundant at Panama, whore numerous specimens 

 were secured. (Gilbert.) (wepSdA?/, wary, fox-like.) 



Carcharhinus, sp. intlescr., Jordan, Proe. U. S. Nat. Mus. ISSr), 363. 



Carcharhinus ceidalc, Gilbert, Fishes of Panama, MS. 1898, Panama. (Type, No. 11884, 

 L. S. Jr. Uuiv. Mus. Coll. Dr. Gilbert.) 



Page 39. Careharhinus nicaraf/uensis or its marine original form was 

 found in abundance in the Bay of Pauama by Ur. Gilbert. 



Page 41. After Carcharhinus oxyrhynchus add: 



54(b). CARCHARHINUS VELOX, Gilbert, new species. 



Preoral portion of snout slightly more than If times width of mouth, 5 

 times distance between nostrils, 1| times width of snout opposite outer 

 angles of nostrils, 1^ times interorbital width, 2i times distance from chin 

 to line joining angles of mouth. Nostrils transverse in position, the inner 

 augle nearer mouth than tip of snout by a distance slightly less than length 

 of nostril. Front of eye equidistant from nostril and front of mouth, the 

 middle of eye nearer angle of mouth than nostril ; diameter of eye less than 

 nostril, slightly more than I longest gill slit. Snout very porous. Folds at 

 augle of mouth slightly longer than usual. Gill slits rather wide, the middle 

 one If times diameter of orbit. Teeth of lower jaw very narrow, erect, 

 very minutely serrulate, appearing entire except under a lens. Teeth in 

 upper jaw very oblique, wide at base, with a deep notch on outer margin, 

 the terminal cusp rather narrowly triangular. Pectoral broadly falcate, 

 the anterior margin convex, the distal edge concave, both angles rounded; 

 tip of pectoral reaching a short distance beyond base of first dorsal ; 

 anterior margin of pectoral 2? times the posterior (inner) margin, about 

 1^ times the distal edge; first dorsal inserted about the diameter of orbit 

 behind a vertical from axil of pectoral, nearer pectoral, therefore, than 

 ventral; antericn* margin concave basally, convex ou distal half, the ante- 

 rior angle rounded; free margin concave, largely owing to the much pro- 



