PRIST1S CUSPIDATUS. 261 



The less specialized of the species are those of which the rostra are broader 

 and more tapering and of which the rostral teeth are fewer in number. A dozen 

 or more of fossil species from the Lower Eocene and later, in Europe and America, 

 have been described from detached rostral teeth, vertebrae, and other fragments. 



Tropical and subtropical seas; some or all the species entering fresh waters. 



Dorsal origin behind bases of ventrals 

 subcaudal lobe prominent 



23-35 teeth on each edge of rostrum . . cuspidatus (page 261) 

 Dorsal origin more than g length of base behind origins of ventrals 

 subcaudal lobe absent 



25-32 teeth on each edge of rostrum 



second dorsal equal the first . . . zysron (page 262) 

 Dorsal origin opposite origins of ventrals 

 subcaudal lobe absent 



24-32 teeth on each edge of rostrum 



second dorsal reaching the caudal . . pectinatus (page 262) 

 Dorsal origin I length of base behind origins of ventrals 

 subcaudal lobe absent 



21 teeth on each edge of rostrum 



second dorsal smaller ..... clavala (page 263) 

 Dorsal origin opposite origins of ventrals 

 subcaudal lobe absent 



16-20 teeth on each edge of rostrum 



second dorsal about equal first . . . pristis (page 264) 

 Dorsal origin in advance of origins of ventrals 

 subcaudal lobe small 



17-22 teeth on each edge of rostrum 



second dorsal smaller microdon (page 265) 



Pristis cuspidatus. 



Pristis cuspidatus Latham, 1794, Trans. Linn. soc. London, 2, p. 279, pi. 26, f. 3; Schneider, 1S01, 



Bloch Ichth., p. 351; Muller & Henle, 1841, Plagios., p. 107; Dumeril, 1865, Elasm., p. 476; 



Day, 1878, Ind. fishes, p. 728, pi. 191, f. 3; Annandale, 1909, Mem. Ind. mus., 2, p. 5. 

 Squalus pristis Russell, 1803, Coromandel fishes, 1, p. 8, pi. 13. 

 Yahla Russell, 1S03, ibid. 

 Pristis semisagiltatus Shaw, 1804, Zool., 6, pt. 2, p. 361 ; Muller & Henle, 1841, Plagios., p. 108, pi. 60; 



T. Cantor, 1849, Malay fishes, i>. 1389; Bleeker, 1852, Verh. Bat. gen., 24, p. 53; Dumeril, 



1865, Elasm., p. 477; Day, 1865, Fishes Malabar, p. 272. 



