40 Bulletin 47, United States National Museum. 



Subgenus ISOGOMPHODON, Gill. 

 52. CARCHARHINUS )THALORUS, (Jordan & Gilbert). 



Body robust, the head rather long and pointed in profile, flattish above; 

 snout from mouth equal to distance between angles of mouth, \ greater 

 than from chin to line connecting these angles ; interorbital width slightly 

 more than snout from eye ; 3 short furrows from angle of mouth ; teeth 

 in both jaws narrowly triangular, nearly erect and scarcely notched 

 on the outer margin, all finely serrate; pores not conspicuous ; gill open- 

 ings large. Free margins of all fins concave. Insertion of first dorsal 

 close behind base of pectoral ; length of base of first dorsal less than its 

 height ; interspace between dorsals 2 to 2i times base of first dorsal and 

 4 times second, which is much smaller than first. Tail about \ total 

 length ; anal a little longer than second dorsal. Eyes very small. Pec- 

 torals somewhat falcate, reaching to opposite posterior part of base of 

 dorsal, their tips pointed; pectoral, 6 in body. Slaty gray ; upper edge 

 of tail blackish ; tips of all fins blackish. L. 6 feet or more. Mazatlan 

 to Panama; common; very close to C. llnibatus. (a/#a^, soot; opoj-, 

 margin.) 



Carcharias selhalorus, JORDAN & GILBERT, Proc. U.S. Nat. Mus., 1882, 104, Mazatlan. (Type, 

 Nos. 28202, 29549.) 



53. CARCHARHINUS LIMBATUS, (Mttller & Henle). 



(CAgONETTA.) 



Snout somewhat pointed in front, rather produced, the distance between 

 its extremity and the mouth somewhat less than width of mouth ; nos- 

 trils nearly midway between the extremity of snout and mouth ; teeth 

 27:30' similar in form in both jaws, erect, constricted, on a broad base, the 

 upper more distinctly serrated than the lower ; gill openings wide, at 

 least twice as wide as the eye, which is small. Pectorals falciform, ex- 

 tending beyond end of dorsal, the length of their upper margin being 

 nearly 4 times that of lower. First dorsal commencing very close 

 behind the axil of the pectoral ; origins of second dorsal and anal oppo- 

 site to each other, the bases being nearly equally long. Caudal fin long, 

 its length equal to distance between the origins of the 2 dorsal fins. 

 Color gray, lower side of the extremity of the pectoral, extremities 

 of the second dorsal and anal and of the lower caudal lobe, black. 

 (Gunther.) Tropical seas, north to Florida; a stray specimen taken at 

 Woods Holl, Mass. ; common in Brazil ; used as food by the very poor. 

 j edged.) 



Carcharias (Prionodon) limbatus, MULLER & HENLE, Plagiostomen, 49, 1838, Martinique. 



Carcharias limbatus, GT}NTHER, Cat., vni, 373, 1870. 



Isogomphodon limbatus, JORDAN & GILBERT, Synopsis, 23, 1883. 



Isogomphodon macidipinnis, POEY, Repertorio, i, 191, 1867, Cuba. 



Carcharias miilleri, STEINDACHNER, Sitzber. Akad. Wiss. Wien., 1867, 356, West Indies. 



Carcharias microps, LOWE, Proc. Zool. Soc., 1840, 38, Madeira. 



Prionodon cucuri, CASTELNAU, Anim. Ame"r. Sud. Poiss., 99, 1855, Bahia. 



64. CARCHARHINUS OXTRHYNCHUS, (Miiller & Henle). 



Snout very much elongate, pointed, narrow ; distance between mouth 

 and tip of snout about twice distance between nostrils; a short labial 



