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Show 870 LIEUT.-COL. PLAYFAIR ON [NOV. 14, 203. CARCHARIUS BLEEKERT. Carcharius (Prionodon) bleekeri, Dum. Hist. Poiss. i. p. 367- Praeocular portion of snout a little less than the width of the inter-ocular space. Nostrils equidistant between the point of the snout and tbe anterior of the mouth. Teeth different in each jaw ; those in the upper jaw are oblique, with a reentering angle on the exterior side, and are denticulated both on the point and base; those in the lower jaw are straighter and more finely denticulated. The first dorsal commences a short distance behind the interior angle of pectorals, and is more than four times as high as the second, which is situated immediately above the anal, and, like it, has the posterior angle much prolonged. Caudal one-fourth of the total length ; its upper lobe is twice the length of the lower one. The extremity of the pectorals, particularly underneath, the superior angle of the second dorsal, but not the first, and the angle of the inferior lobe of caudal are marked with deep black.-A. Dum. Length 3' 10". Hab. Seychelles; Pondicherry. Two typical specimens of this species exist in the Paris Museum ; length respectively lm*31 and 0m*78. 204. ZYG^ENA MALLEUS, Shaw. Creole name " Marteau." 205. TRI^ENODON OBESUS. Squalus obesus, Riipp. N. W . Fische, p. 64, pl. 18. f. 2. Tricenodon obesus, Miill. & Henle, Plag. p. 55, pl. 20 ; Dum. Hist. Poiss. i. p. 386. Snout short, rounded. Nostrils equidistant between the anterior edge of the mouth, which is broader than high, and the extremity of the snout. They have a transverse valvule, small, and without cirrhus. Teeth with an elongated median point, and with one or two toothlets on each side of the base; some have a double toothlet on the inner side. First dorsal nearer the ventrals than the pectorals. Anal opposite, and nearly equal to the second dorsal. A semicircular groove at the top of the root of the caudal. Lower caudal lobe about half as long as the upper. General colour grey; the superior angle of both dorsals and the points of both caudal lobes of a milky white.-A. Dum. Creole name " L'endormi." Hab. Seychelles ; Red Sea. 206. GALEOCERDO TIGRINUS. Galeocerdo tigrinus, Miill. & Henle, Plag. p. 59, pl. 23; Dum. Hist. Poiss. i. p. 393. Snout flat, rounded, and rather short. Nostrils lateral, equidistant between the extremity of the snout and the anterior of the mouth. Circular spout-holes behind the eyes. Median tooth of |