384. CALIFORNIA ACADEMY OF SCIENCES. 12 
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, rr 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 Pristes perrotetz) by Dr. 
Gilbert from Mazatlan, and by Dr. Giinther from Chiapam. 
Dr. Giinther identifies this species with Pr7st7s perrotetz 
described by Miller & 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 Przstzs perottetd differs 
from our fish. 
We append the description of Miller & Henle, as also 
the descriptions given by Latham of his Prestzs antequorum 
and Przstis pectinatus, together with our account of the 
common saw fish of the Gulf of Mexico, usually and 
probably correctly identified as Prést7s pectinatus Latham. 
The following is the original description of 
““Spec. 4. Pristis Perotteti, N. FP 
Kopf. ‘‘Die Form des Kopfes und der Naslécher wie Pristis antiquorum. 
Die Sage lauft nach vorn sehr allmahlig spitz zu. Sie ist an der 
Basis 1 Zoll 7 Linien, an der Spitze zwischen den beiden letzten 
Zaihnen 10 Linien breit, 19 Ziihne jederseits. Diehintersten Zihne 
sind kurz, wahrscheinlich abgenutzt. Die vordersten sind etwas 
breiter als die Hilfte der Breite der Sige, alle am hintern Rande 
gerinnt. Die hintern Ziihne stehen weit aus einander, um 5-6 Mal 
die Breite des Zahns. Die vordersten sind einander etwas mehr 
