344 



SNODGRASS AND HELLER 



adults average 6 to 8 feet in length. We examined a large number 

 of them, several hundred being taken aboard the schooner, and we saw 

 probably thousands in the water. None of them had the fins marked 

 with white. They feed on fish and are probably dangerous enemies 

 of the young fur-seals and sea-lions of the Galapagos Islands, for they 

 closely patrol the shores about the seal rookeries. We often found in 

 their stomachs pieces of sea-lions, but they may have been feeding on 

 the carcasses left by the sealers. 



MEASUREMENTS OF CarcJiarias galapagensts . 



No. Stanford University Museum. 



Length to base of caudal fin in mm. 



Snout to pectoral 



Snout to first dorsal 



First dorsal to second dorsal 



Upper lobe of caudal 



Base of pectoral to base of ventral..., 



Pectoral 



Height of first dorsal 



12326 



12325 



12324 



4. CARCH ARIAS PLATYRHYNCHUS (Gilbert). 



Etilamia {Platypodon) platyrhynchus Gilbert (in part), Proc. U. S. Nat. 



Mus. 1 89 1, 543, Clarion and Socorro islands and Magdalena Bay, Lower 



California. 

 Carcharhinus platyrhyiichus, Jordan & Evermann (in part). Fishes North 



and Mid. Amer., i, 36, 1896, 



Range. — Coast of Lower California (Magdalena Bay) ; Revilla- 

 gigedo Islands; Clipperton Island. 



The collection contains one specimen from Clarion Island and one 

 taken at sea between Clarion and Clipperton islands, 13° 12' N. ; 

 111° 45' W. The Clarion specimen, which is about 3^ feet long, 

 has the dorsal and pectoral fins tipped and posteriori)' bordered with 

 white, and all others seen in the water about the island were similarly 

 marked. The specimen taken near Clipperton Island has the mar- 

 ginal parts of the fins pale. In the original description of the species 

 Dr. Gilbert assigns this fin coloration to the largest specimens only. 



5. TRI^NODON OBESUS (Riippell). 



Carcharias obesus Ruppell, Neue Wirbel., Fisch., 64, pi. 18, fig. 2, 1837. 

 Trianodo7i obesus, Muller & Henle, 55, pi. 20. — Dumeril, Hlasmobr., 

 386. — GiJXTHER, Cat., VIII, 383, 1870. 



Range. — Red Sea, Indian Ocean, New Hebrides, Cocos Island. 



One specimen, about 5 feet long, taken at Cocos Island. This 



is the only record of the species from the Eastern Pacific. 



