10 BULLETIN 95, UNITED STATES NATIONAL MUSEUM. 



nounced and lower than those in upper jaw, the central cusp being 

 much blunter and the lateral cusps entirely or nearly lacking in the 

 teeth in front of jaws near symphysis. 



The shape of the fins is essentially the same as in M. ahhotti, from 

 which the present species may be recognized by the marked differ- 

 ence in coloration and the character of the teeth. The first dorsal 

 and the ventrals are inserted farther caudad than in abbotti, but 

 have the same relative position with reference to each other; the 

 caudal is longer, thereby lessening the distance between the base of 

 caudal and the second dorsal and anal, the former reaching to within 

 one-half the length of snout to upper base of caudal and the latter 

 to within less than half a diameter of eye to base of lower caudal 

 lobe. The caudal is one-fifth of the total length. The claspers do 

 not reach to the tips of the ventrals. 



Color in alcohol, dusky olivaceous, lighter on ventral surface; 

 scattered black spots on back, sides, and base of dorsals. 



The paratype agrees closely with the type, the teeth being some- 

 what blunter, and there are fewer black spots on the sides. Color 

 in life, body with black spots very irregularly disposed, in our speci- 

 mens more numerous and larger on the left side than on the right. 



Genus GALEUS Rafinesque. 



S. GALEUS ZYOPTERUS (Jordan and Gilbert). 

 TOLLO. 



Galeorhinus zyopterus Jordan and Gilbert, Synopsis Fishes North Amer., 

 Bull. U. S. Nat. Mus.. 16, 1S82 (1883), p. 871; San Pedro, Cal.— Jordan 

 and EvERMANN, Fishes North and Mid. Amer., vol. 1, 1896, p. 32 ; vol. 4, 

 1900, pi. 4, fig. 15. 



Galeits zyopterus Jordan, Guide to Study of Fishes, vol. 1, 1905, p. 541, 

 fig. 834. 



Three specimens, field Nos. 09421, 09423, 09436, respectively, 36, 

 37.5, and 40.5 cm. long, from Pacasmayo, taken with hook and line 

 from the pier and in the bay. 



Following are the dimensions of the largest example : 



mm. 

 Total length 405 



Distance from tip of snout to first gill-slit 72 



Distance from tip of snout to eye 30 



Diameter of eye 15 



Length of spiracle 4 



Interorbital 22 



Depth of body 41 



Distance from tip of snout to front of mouth 28 



Distance between nostrils 15 



Distance between angles of mouth 31 



Distance from tip of snout to base of first dorsal 120 



