91 
Genus CHIMERA, Linnaeus. 
to %% 
[Syst. Nat, ed. vol. i. 1766, p. 48±.] 
Syn. (P) Dijpristis , P. Gervais, ZooL et Pal. Gen. 1869, p. 240. 
Snout soft, prominent, without appendage; tail diphycercal. 
Mandibular tooth laterally compressed, with no well-defined thick¬ 
ening upon the outer aspect immediately below the oral margin, and 
the symphysis narrow ; anterior tritor minute, anterior outer tritor 
subdivided into two or three small portions, posterior outer tritor 
similar; median tritor large. Palatine tooth moderately robust, 
with a slightly defined thickening upon the outer aspect; anterior 
and posterior inner tritors small; median tritor small; outer tritor 
extending throughout the oral margin, subdivided into a series of 
small points. Vomerine tooth quadrate in side view. Dorsal fin- 
spine laterally compressed, smooth or longitudinally striated, with a 
double series of posterior denticles. Head-spine of male short, 
arched, with a terminal cluster of denticles. 
Chimsera pliocenica, sp. nov. 
[Plate I. fig. 15.] 
Type. Right palatine tooth ; British Museum. 
A very large species, the antero-posterior measurement of the 
palatine tooth being not less than 0*025. Palatine tooth compara¬ 
tively robust; posterior inner and median tritors of about equal 
size ; anterior inner tritor small and narrow, fixed upon the down¬ 
wardly-curved anterior extremity of the tooth. 
Teeth probably for the most part referable to this species have 
been determined as Isehyodus egertoni , Edaphoclon mantel/i, E. bucJc- 
landi , and E. leptognathus (R. Lawley, Nuovi Studi Pesci, etc. 
Colline Toscane, 1876, p. 51). 
Form. Log. Pliocene : Tuscany. 
47032. Type specimen, shown of the natural size, from three aspects, 
in PI. I. fig. 15, a-c ; Orciano, Tuscany. 
Purchased, 1875. 
A small species has also been described as follows :— 
Chimcera javana, K. Martin, Samml. geol. Reichs-Museum Leiden 
[1] vol. iii. (1883), p. 30, pi. ii. figs. 25, 26.—Tertiary ; 
Ngembak, Java. [Upper teeth; Leyden Museum.] 
