72 



PISCES 



CLASS I 



Family 4. Coelacanthidae. Huxley. 1 



Body covered with thin, cycloidal ganoid scales. No ossified vertebrae. Arches, 

 spinous processes, and supports of caudal fin superficially ossified. Air bladder 

 ossified. Paired fins with a short, obtuse lobe. Each of the two dorsal fins and the 

 anal fin supported by a simple, usually proximally forked plate, which in the anterior 

 dorsal is in direct contact with the dermal rays. Caudal fin distinctly diphy cereal, 

 borne above and below by numerous simple supports, and terminating in a small pro- 

 jecting tufted fin. Only one opercular bone on each side and a pair of jugular 

 plates ; but several splenial bones present. Upper Devonian to Upper Cretaceous. 



Coelacanthus, Ag. (Hoplopygus, Ag. ; Conchiopsis, Cope ; Bhabdoderma, Reis). 

 Teeth absent on the margin of the jaws, but a few hollow, conical teeth 

 within. Supplementary caudal fin prominent. External bones and scales 

 ornamented with series of tubercles or fine ridges of ganoine ; fin rays not 

 denticulated. Carboniferous and Permian of England, Scotland, 'Germany 

 (Kupferschiefer), and North America. Fragments probably also in Upper 

 Devonian of Harz Mountains. 



Graphiurus, Kner ; Heptanema, Bellotti. Trias of Raibl and Perledo. 



Diplurus, Newb. Trias ; New Jersey and Connecticut. 



Undina, Miinster (Holophagus, Egerton), (Fig. 131). Supplementary 

 caudal fin prominent. All the fin rays robust, broad, and closely articulated 



Fig. 131. 



Undina penicUlata, Miinst. Upper Jurassic (Lithographic 

 Stone) ; Landt, near Eichstadt. 1/3 (after Huxley). ./', Jugular plates ; 

 b, Scales from upper region of trunk of Undina acutidens, Reis. 



W^m/i'-w 



distally ; the anterior rays of the first dorsal and caudal fins denticulated or 

 tuberculated. External bones and scales rugose and tuberculated. Lower 

 Lias to Lower Kimmeridgian. 



Libys, Miinst.; Coccoderma, Querist. Lithographic Stone (Lower Kim- 

 meridgian) ; Bavaria and Wiirtemberg. C. substriolatum, Huxl. sp., from 

 Kimmeridge Clay, England. 



1 Huxley, T. If., Illustrations of the Structure of the Crossopterygian Ganoids (Mem. Geol. 

 Surv. dec. XII.), 1866.— Iteis, 0., Die Coelacanthinen (Palaeontogr. vol. XXXV.), 1888; also 

 Geogn. Jahresh., Miinchen, 1892. 



