42 BULLETIN 189, UNITED STATES NATIONAL MUSEUM 



Galeocerdo articus Meek and Hildebrand, 1923, p. 56, Panama Bay (synonymy; 

 description; range). — Beebe and Tee- Van, 1941, p. 113, fig. 23 (range; field 

 characters; size; references). 



This large shark, though not recorded from Peru, may be expected 

 there. In fact it has been seen and taken several times in the Gala- 

 pagos Islands. It is recognized by its heavy body, broad snout, 

 very wide mouth, large caudal fin with a long upper lobe and a keel 

 at the base, and usually by the presence of black spots or bars, which, 

 however, may be lost with age. The teeth in the jaws are strong, 

 curved backward, with a notch posteriorly, followed bj'^ coarse serrae; 

 the main cusp also with serrate margins. 



The tiger shark, which attains a length of perhaps 6 meters or 

 more, is considered among the most dangerous to man. 



Range. — Tropical seas. Recorded on the Pacific coast of America 

 from San Diego, Calif., to the Galdpagos Islands. 



Genus GALEORHINUS Blainville, 1816 



Body moderately slender; head depressed; snout rather narrow; eye 

 elongate, with nictitating membrane; mouth moderately wide, with 

 rather well developed labial folds; teeth subtriangular, lateral ones 

 inclined backward, more or less notched or serrate at base posteriorly; 

 spiracle small, rather close behind eye; first dorsal over space between 

 pectorals and ventrals; second dorsal and anal more or less directly 

 opposite each other. 



A single species is included in the collection. 



GALEORHINUS ZYOPTERUS Jordan and GUbert 



TOLLO 



Galeorhinus zyopterus Jordan and Gilbert, 1883a, p. 871, San Francisco, Calif., 

 to Cerros Island, Baja California (original description; previously identified 

 with G. ffaZews).— Jordan and EvERMANN, 1896, p. 32; 1900, pi. 4, fig. 15 

 (description; range). 



Galeus zyopterus Evermann and Radcliffe, 1917, p. 10, Pacasmayo, Peru 

 (description based on 3 small specimens). 



Galeorhinus galeus Fowler (probably not of Linnaeus), 1941a, p. 223 (references). 



Body moderately slender, its depth at origin of first dorsal 7.0 to 7,5 

 in length anterior to base of upper lobe of caudal; caudal peduncle 

 rather slender, its least depth 5.4 to 5.75 in head to first gill slit; 

 head much depressed, its depth over eyes notably less than width of 

 mouth, its length to first gill sht 3.4 to 3.8 in length anterior to base 

 of upper lobe of caudal; snout moderately long and pointed, 2.4 to 2.8 

 in head, its preoral length about equal to width of mouth, 2.5 to 2.8 in 

 head; eye somewhat elongate, 5.0 to 5.9; pupil nearly or quite round; 

 a definite notch behind eye; spiracle small, oval or an elongate slit 

 rather close behind eye ; mouth moderately wide, about as broad as 

 head at nostrils, 2.4 to 2.8 in head; labial folds well developed, the upper 



