﻿52 CHIMJ2R0IDEI. 



Chimaeropsis paradoxa, Zittel. 



1843. " Knochen," H. von Meyer, in Minister's Beitr. Petrefakt. i. p. 96, 



pi. viii. fig. 1. 

 l887. Chimceropsis paradoxal. A. von Zittel, Handb. Palaeont. vol. iii. 



p. 114, woodc. fig. 126. 

 1887. Chimceropsis paradoxa, J. Biess, Palaeontogr. vol. xxxiv. p. 21, 



pi. ii. figs. 9-11, pi. iii. figs. 1-10. 



Type. Imperfect skeleton ; Palaeontological Museum, Munich. 



The type species, attaining a length of not less than one metre ; 

 dorsal spine in such a specimen 0*15 in length. Two closely 

 apposed, angulated dermal plates on either side of the back of the 

 head. Dorsal fin-spine rapidly tapering, gently arched, and all the 

 anterior denticles pointing upwards. Mandibular tooth robust in 

 appearance, with prominent beak and gently excavated, scarcely 

 undulating oral margin; presymphysial tooth sharply rounded in 

 front. Vomerine tooth about one and a half times as long as its 

 maximum width behind ; the maxillary tooth much narrower. 



Form, fy Log. Lower Kimmeridgian (Lithographic Stone) : Bavaria. 



Not represented in the Collection. 



To Chimceropsis also must doubtless be assigned the first of the 

 dorsal fin-spines described as follows : — 



Myriacanthus franconicus, G. von Minister, Beitr. Petrefakt. iii. 

 (1840), p. 127, pi. iii. fig. 8. — Upper Jurassic ; Babenstein, 

 Bavaria. 



Myriacanihus vesiculosus, G. von Minister, ibid. v. (1842), p. Ill, 

 pi. vi. fig. 3. — Corallian ; Lindnerberg, Hanover. [? Frag- 

 ment of Asteracanihus.~] 



A spine from the Lower Carboniferous of Russia, certainly not of 

 the Myriacanthidae, is named Myriacanthus semigranulatus, H. Ro- 

 manowsky, Bull. Soc. Imp. Nat. Moscou, 1864, pt. ii. p. 167, pi. iv. 

 fig. 34. 



Family CHEVLERIDJE. 



Body elongated : anterior dorsal fin above the pectorals, provided 

 with a long, straight, robust spine. Teeth forming two pairs of 

 robust dental plates in the upper jaw, both pairs thickened and 

 closely apposed in the longitudinal mesial line of the mouth ; lower 

 dentition consisting of a single pair of large, beak-shaped plates, 

 meeting at the symphysis ; most of the plates with several tritoral 

 areas. Dermal plates absent. Males with a prehensile spine upon 

 the snout. 





