II FISHES OF SINALOA. 383 



Family SPHYRNID^. 



8. Sphyrna tiburo ( LiniKi'us). Cornuda. 



One specimen obtained by us at Mazatlan. It was not 

 secured by Dr. Gilbert; this being' the first record on the 

 Pacific Coast of America of this common Atlantic species. 

 Our specimen seems to agree fully with an example from 

 Florida. 



9. Sphyrna tudes (Cuvier). Cornuda. 



Not rare at Mazatlan, where specimens were obtained 

 by Dr. Gilbert, and one by the Hopkins expedition. 



10. Sphyrna zygaena Linnaeus. Cornuda. 



Common in the sea about Mazatlan. Three young 

 specimens taken by us. Also recorded by Dr. Gilbert 

 from Mazatlan and Panama. 



Family PRISTIDID^. 



11. Pristis zephyreus Jordan & Starks n. sp. Pez de 

 Espaua. 



Snout to nostrils, 3 in length to base of caudal; breadth 

 of saw at anterior end between first two pairs of teeth 

 half breadth of its base behind the last pairs; teeth on 

 saw trenchant behind, arranged in 22 pairs; hinder teeth 

 wide apart, the interspaces 5 times their base ; posterior 

 teeth turned slightly backward, a groove on their posterior 

 edge ; front teeth not quite half as long as the saw is 

 broad at their base; distance between first and second 

 tooth three times base of first. (Other specimens exam- 

 ined for us by Dr. G. W. Rogers show 18 to 21 pairs of 

 teeth.) Eye equal to spiracle, contained 3 times in base 

 of saw just behind last pair of teeth ; width of mouth a little 

 greater than base of saw; mouth with about 65 series of 

 blunt teeth; slant height of pectoral in front, a little more 



