PRISTIS CUSPIDATUS. 



261 



zysron (page 262) 



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 ^ length of base behind origins of ventrals 

 subcaudal lobe absent 



25-32 teeth on each edge of rostrum 

 second dorsal equal the first 

 Dorsal origin opposite origins of ventrals 

 subcaudal lobe absent 



24-32 teeth on each edge of rostrum 

 second dorsal reaching the caudal . 

 Dorsal origin I length of base behind origins of ventrals 

 subcaudal lobe absent 



21 teeth on each edge of rostrum 



second dorsal smaller .... 

 Dorsal origin opposite origins of ventrals 

 subcaudal lobe absent 



16-20 teeth on each edge of rostrum 

 second dorsal about equal first . 

 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) 



pectinatus (page 262) 



clavata (page 263) 



pristis (page 264) 



Pristis cuspidatus. 



Pristis cuspidatus Latham, 1794, Trans. Linn. soc. London, 2, p. 279, pi. 26, f. 3; Schneider, 1801, 



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, 1803, ibid. 

 Pristis semisagittalus Shaw, 1804, Zool., 5, pt. 2, p. 361; Muller & Henle, 1841, Plagios., p. 108. pi. 60; 



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



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



