II FISHES OF SINALOA. 383 
Family SPHYRNID/E. 
8. Sphyrna tiburo (Linneus). 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. 
g. Sphyrna tudes (Cuvier). Cornupa. 
Not rare at Mazatlan, where specimens were obtained 
by Dr. Gilbert, and one by the Hopkins expedition. 
10. Sphyrna zygena Linneus. CorNUDA. 
Common in the sea about Mazatlan. Three young 
specimens taken by us. Also recorded by Dr. Gilbert 
from Mazatlan and Panama. 
Family PRISTIDID/E. 
11. Pristis zephyreus Jordan & Starks n. sp. PEZ DE 
ESPADA. | 
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 
