THALASSORHINUS PLATYRHYXCHUS. 147 



Resembling the Blue Shark, Galeus glaucus, somewhat in shape and denti- 

 tion but readily distinguished by the spiracles. Snout moderate, pointed. 

 Nostrils midway in the preoral length. Spiracle about one diameter of the eye 

 behind the orbit and half as much in width. Teeth serrated, in 26 rows, sub- 

 triangular, upper broader, more oblique, edges somewhat curved toward the 

 angles of the mouth, as in G. glaucus; lower more pointed, more slender, more 

 erect, with finer serratures, edges concave. Pectoral one fifth as long as the 

 body, falciform, rather small, three times as long as wide, outer angle sharp, 

 inner about 90°. Dorsal between the pectorals and the ventrals, nearer the 

 latter, angles sharp, hind margin concave. Second dorsal a little more than 

 half as long as the first, lower than long, upper angle blunt, hind margin nearly 

 straight. Anal equal the second dorsal, exactly below it, with two sharp angles, 

 hind margin deeply indented. Caudal one fourth of the total length, lower lobe 

 produced to nearly one third of the length of the supraeaudal. Reaches the 

 length of six feet. 



Bluish gray; below white. 



Mediterranean and Atlantic. 



Thalassorhinus platyrhynchus. 



Squalus platyrynchus \YAhBAini, 1784, Schr. Gesellsch. nat. freunde, Berlin, 5, p. 381; 1792, Artedi 



p. 521. 

 Thdlassorhinus platyrhynchus Muller & Henle, 1841, Plagios., p. 63; Gray, 1851, Chondropterygii, 



p. 55; DuMERiL, 1865, Elasm., 396; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 379. 



Trunk fusiform. Snout broader than long, depressed, rounded in front. 

 Nostrils nearer to the mouth than to the end of the snout. Spiracle small, 

 behind the eyes. Teeth serrated, oblique; upper large, triangular, oblique, 

 cusps sword-shaped; lower smaller, narrower, more erect, cusps awl-shaped on 

 broad bases. Gill openings narrower backward. Pectorals falciform, elongate. 

 Dorsal above the space between the pectorals and the ventrals, hind margin 

 deeply concave. Second dorsal shaped like the first, smaller. Ventrals tri- 

 angular, longer than broad. Anal opposite the end of the second dorsal, deeply 

 indented on the hind margin. Supraeaudal long, axis somewhat raised, sub- 

 caudal lobe produced, half as long as the entire caudal. Type six feet in length. 



Back greyish with some longitudinal stripes and spots of blackish; lower 

 surfaces whitish. 



Locality? 



