342 SNODGRASS AND HELLER 



Family BRANCHIOSTOMID.E. 



I. BRANCHIOSTOMA ELONGATUM Sundevall. 



Branchiostoma elongatum Sundevall, Vet. Akad. Forh. 1853, 147, Chin- 

 chas Islands. — Jordan & Evermann, Fishes North and Mid. Amer., 

 I, note, 4, 1896. — Steindachner, Fauna Chilensis, 334, 1898 (Cav- 

 ancha Bay, Iquique). 



Range. — Coast of Peru, Chinchas Islands, Galapagos Islands. 



Not hitherto reported from the Galapagos ; 13 specimens, the largest 

 20 mm. long, dredged in about 10 fathoms on a bottom of fine black 

 sand in Tagus Cove, Albemarle. 



Family GALEID^. 



2. GALEOCERDO TIGRINUS Miiller & Henle. 



Galeocerdo tigrinus Muller & Henle, Plagiostomen, 59, 1838. —Jordan & 

 Evermann, Fishes North and Mid. Amer., i, 32, 1896. 



Range. — India, Australia, Polynesia, Galapagos Islands, west coast 

 of tropical America. 



Individuals of this species frequently seen in Tagus Cove, Albe- 

 marle and in the straits between Albemarle and Narboro. Generally 

 solitary or associated with Carcharias galapagensis. Easily distin- 

 guished from the latter by the greater size and by the vertical stripes 

 on the sides of the body. 



We have the jaws and skin of the head of one specimen 9 feet 

 long (2,700 mm.), and all that we saw were of about this length. 

 The upper lobe of the caudal fin is about one-fourth of the total 

 length, and is considerably shorter than the space between the doi'sal 

 fins. 



Color: above, grayish, spotted with obscure dusky which runs into 

 vertical bars on the sides of the body; below whitish. 



Snout to first dorsal 33 mm. ; snout to second dorsal yS ; snout to pec- 

 toral 26 ; snout to ventral 44 ; snout to anal 80 ; upper lobe of caudal 25 ; 

 first dorsal to second dorsal 33 ; pectoral 15. Snout short, length from 

 tip to front of mouth about i^ in width of mouth. Nostril 3 in snout. 

 A groove along the base of each jaw, the two continuous around the 

 angle, upper about twice length of lower. Nostril with large triang- 

 ular flap on inner half of anterior margin. 



Teeth all of same shape, being flat and triangular with a deep notch 

 on outer side — a notch so large as to give the tooth a bilobed appear- 

 ance, the lobes being one basal and the other apical, both directed out- 

 wardly ; free edge of basal lobe roundly convex with coarse serrations ; 



