THE SHORE FISHES OF PERU 41 



to 4.75 in head; ventral rather small, inserted about an eye's diameter 

 nearer origin of anal than inner distal angle of pectoral, its distal 

 margin very slightly concave, the outer margin 4.15 to 4.25 in head; 

 pectoral moderate, with slightly concave distal margin, inserted 

 under foiu-th gill slit, its greatest length 5.45 to 5.65 in length anterior 

 to base of upper lobe of caudal. 



Color bluish gray above; rather abruptly pale at or somewhat 

 below middle of side; margin of caudal, exclusive of exserted portion 

 of lower lobe, with a narrow black margin. 



The foregoing description is based on two specimens, a male 670 

 mm. and a female 665 mm. long. The claspers in the male are 

 rather more than three times the length of the ventral fin. In addition 

 to the specimens mentioned the collection contains five embryos, 

 277 to 300 mm. long, removed from a female 154 cm. long. These 

 agree fairly well with the adults, except that the teeth are virtually 

 undeveloped. The following proportions are based on two of the 

 embryos mentioned: Depth at first dorsal in length anterior to base 

 of upper lobe of caudal 6.0 to 6.35; head to first gill slit 3.3 to 3.4; 

 predorsal length 2.1 to 2.2; distance between dorsal fins 3.15 to 3.25; 

 upper lobe of caudal 2.8 to 2.9; pectoral 6.0 to 6.35. Caudal peduncle 

 in head to fii-st gill slit 5.25 to 5.4; snout 2.25 to 2.4; preoral length of 

 snout 2.3 to 2.4; eye 8.3 to 8.75; width of mouth 2.95 to 3.15; anal 

 base 5.25 to 5.6; outer margin of ventral 4.2 to 4.8. 



The two adult specimens in the collection, according to Mr. Lobell's 

 field notes, were taken on August 15 on a line trawl with 15 others, 

 14 of which ranged from 720 to 970 mm. in length, and one was 

 1,540 mm. long, in the Gulf of Guayaquil near Cabo Blanco. The 

 embryos mentioned in the preceding paragraph were removed from 

 a female 154 cm. long taken on the same date, at the same place, 

 and by the same method, in 12 fathoms. A specimen from Panama, 

 580 mm. long, is at hand for comparison. 



Range. — Gulf of California to northern Peru. 



Genus GALEOCERDO Miiller and Henle, 1837 



Body robust; snout short, broad; mouth wide; teeth similar in both 

 jaws, large, the lateral ones curved backward, coarsely serrate on 

 both margins; labial folds present; nictitating membrane present; 

 spiracles small, behind eyes; first dorsal nearer pectorals than ventrals; 

 second dorsal and anal opposite each other; upper lobe of caudal long. 



GALEOCERDO ARTICUS (Faber) 



Tiger Shark; Leopard Shark 



Squalus articus Faber, 1829, p. 17, Iceland and neighboring seas (original de- 

 scription) . 



Galeocerdo maculatus Jordan and Bollman, 1890, p. 179, Panama Bay. 



Galeocerdo tigrinus Snodgrass and Heller, 1905, p. 342, Albemarle and Nar- 

 borough Islands, GaMpagos. 



