﻿CHIM^RID.^. 



91 



Genus CHIMiERA, Linna3us. 

 [Syst. Nat. ed. 12, vol. i. 1766, p. 401.] 



Syn. (?) Dipristis, P. Gervais, Zool. et Pal. Gen. 1869, p. 240. 



Snout soft, prominent, without appendage ; tail diphy cereal. 

 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. Yomerine 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 Ischyodus egertoni, Edaphodon mantelU, E. bucJc- 

 landi, and E. leptognatlius (R. Lawley, Nuovi Studi Pesci, etc. 

 Colline Toscane, 1876, p. 51). 



Form. Sf 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 ; 

 jSTgembak, Java. [Upper teeth; Leyden Museum.] 



