CARCHARINUS POROSUS. L31 



of the width; labial folds very short, in the angle, on both jaws. Teeth serrated, 

 in |§ rows, median two in the upper series very small; upper teeth broader, 

 oblique with an indentation on the outer edge; lower more erect, with broad 

 liases and lanceolate cusps. Gill openings about twice the width of the orbit, 

 two above the base of the pectoral. Pectorals nearly twice as long as wide, 

 falciform, pointed, reaching backward as far as the end of the base of the dorsal. 

 Dorsal origin little forward of the inner angle of the pectoral, base length equal 

 the width of the mouth or more than one third of the distance from the second 

 dorsal, hind margin concave, end of fin distant from a vertical at the origin of 

 the ventral about half the total length of the dorsal. Second dorsal small, base 

 one third as long as that of the first and above the middle of the anal base. 

 Ventrals larger than the anal, with blunted angles. Anal larger than the second 

 dorsal, base longer, equal half the distance from the caudal pit, hind margin 

 deeply notched. Caudal more than one fourth of the total length, little longer 

 than the distance between the dorsals, end pointed, subcaudal lobe prominent. 



Back greyish brown; lower surfaces whitish. 



Total length 40, snout to abdominal pores 2lf, snout to fifth gill opening 9, 

 snout to mouth 3, and caudal fins 11? inches. 



Specimens described from Buzzards Bay, Massachusetts, collected by 

 S. Garman. 



Northern and Middle Atlantic. 



Carcharinus porosus. 



Carcharias pornsus Ranzani, 1839, Novisspec. piscium, 1, p. 8, pi. 2; Ribeiro, 1907, Arch. Mus. nac, 



14, p. 153. 

 Carcharias (Prionodon) porosus Dumeril, 1865, Elasm., p. 373; Gunth., 1870, Cat. fishes Brit, mus., 



8, p. 365. 

 Carcharias (Prionodon) henlei Muller & Henle, 1841, Plagios., p. 46, pi. 19, f . 6 (teeth). 



Snout broad, broadly rounded from the nostrils, blunt at the end, rostral 

 cartilages strong and rigid. Nostrils at the hinder two fifths of the snout, as 

 far from the end as from the eye, with a short point on the valve. Eye small, 

 nearer to the first gill opening than to the end of the snout. Mouth medium, 

 length nearly half that of snout, more than half the width. Teeth serrate, 

 varying in individuals as to amount of serration; upper broader in the cusp, 

 more erect near the median, oblique toward the angles, sharply notched above 

 the base on the outer edge; lower narrowly triangular, erect near the symphysis, 

 oblique outward with a sharp notch; rows If- Width of gill openings equal 

 length of orbit. Pectorals broad, reaching below the greater part of the dorsal 

 base, outer angle blunted, hind margin concave. Dorsal origin little forward 



