384 CALIFORNIA ACADEMY OF SCIENCES. 



than half distance from tip of .snout to mouth. Dorsals 

 sub-equal; first dorsal inserted in advance of ventrals; 

 about half its base over ventrals; caudal, with a lower 

 lobe, which is equal to slant height of pectoral; tail with 

 a keel on side. 



Color, plain olive grey above, light below. 

 Measurements — Length, 50 inches; caudal, 7 inches; 

 pectoral, 7 inches; dorsal front, 5^ inches; snout with- 

 out nostril, 11 inches. 



Type — A skin in L. S. Jr. Univ. Museum. 

 Common in brackish waters at the mouth of the Rio 

 Presidio, where one fine specimen was obtained. The 

 species is also recorded (as Prist is ferroteti) by Dr. 

 Gilbert from Mazatlan, and by Dr. Giinther from Chiapam. 

 Dr. Giinther identifies this species with Pristis ferroteti 

 described by Miiller & Henle, from the Senegal River. 

 In view of the great difference in the fauna of the Gulf 

 of California from that of Equatorial Africa, this identi- 

 fication may be questioned, especially as there are several 

 details in which the description of Pristis ^erotteti differs 

 from our fish. 



We append the description of Miiller & Henle, as also 



the descriptions given by Latham of his Pristis antiquormn 



and Pristis -pectinatus, together with our account of the 



common saw fish of the Gulf of Mexico, usually and 



probably correctly identified as Pristis fectinatus Latham. 



The following is the original description of 



"Spec. 4. Pristis Perotteti, N. 



Kopf . " Die Form des Kopfes uiid der Naslocher wie Pristis antiquorum. 



Die Sage lauft nach Yorn sehr allmahlig spitz zu. Sie ist an der 



Basis 1 Zoll 7 Linien, an der Spitze zwischen den beiden letzten 



Zahnen 10 Linien breit, 19Zahne jederseits. Diehintersten Zahne 



sind kurz, wahrscheinlich abgeuntzt. Die vordersten sind etwas 



breiter als die Halfte der Breite der Siige, alle am hintern Eande 



gerinnt. Die hintern Ziiline stehen weit aus einander, um 5-6 Mai 



die Breite des Zahns. Die vordersten sind einander etwas mehr 



