PEISTIS FAJUMENSIS. 
317 
Subclass ELASMOBRANCHIL 
Order SELACHII. 
Family PKISTIDiF. 
Genus PRISTIS, Latham. 
[Trans, Linn, Soc. vol. ii. 1794, p. 276.] 
Rostral teeth firmly implanted in sockets, forming square notches on the sides of 
the saw-like rostrum. 
Pristis fajumensis, Stromer. 
1897. Propristis schweinfurthi, F. Priem, Bull. Soc. Geol, France, [3] vol, xsv. p. 228 [errore). 
1905, Pristis fajumensis, Ernst Stromer, Beitr. Pal. u. Geol. Oesterreich-Ungarns u. d. Orients, 
vol. xviii. p. 49, pi. vi, figs. 1-3. 
Tjjpe Specimen . — Portions of a rostrum ; Palaeontological Museum, Munich. 
This species is a true Pristis, the teeth being set in calcified sockets, forming 
quadrate notches, about 23 in number, on the sides of the rostrum. 
Form. & hoc. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun, 
C. 10203. A nearly complete rostrum (text-fig. 98). In this specimen there are 22-23 notches for 
teeth on either side ; posteriorly these ai’e not opposite one another on the two sides. 
Text-fig. 98. 
hut to some extent alternate ; at the extreme anterior end the notches are opposite 
to one another. The dimensions (in centimetres) of this specimen are : — 
Extreme length 87 
Greatest width of base of rostrum 8-2 
Width of tip of rostrum 1'3 
Distance between two posterior teeth 4'1 
„ ,, anterior teeth 1'5 
C. 10204. Portion of a rostrum, with notches for teeth much more closely set than last. Possibly 
another species. 
