HYLONOMID^]. 201 



Family HYLONOMID^E. 



Body slender and lizard-like ; skull narrow, with smooth or 

 faintly sculptured bones ; neural spines of vertebrae well developed, 

 and long and slender ribs. Teeth smooth, or with grooved summits. 

 The whole body covered with sculptured scutes (fig. 48). Internal 

 gills may be developed. For Smilerpetum and Hylerpetum see 

 Addenda. 



Genus HYLONOMUS, Owen 1 (eis Dawson). 



Syn. Stelliosaurus, Fritsch 2 . 

 Hyloplesion, Fritsch 3 . 



The type genus. Skull broad, narrowing in front, with rounded 

 muzzle, and the orbits in the anterior half ; cranial bones smooth, 

 with a few irregular pits. Hyloplesion was identified with Holo- 

 nomus by Credner 4 . 



For the type species see Addenda. 



Hylonomus longicostatus (Fritsch 5 ). 



Syn. Stelliosaurus longicostatus, Fritsch 6 . 

 Hyloplesion longicostatum, Fritsch 7 . 



Total length about 0,085 (3-6 inches). 

 Hab. Europe (Bohemia). 



R. 372. Electrotype from a fragment of shale, showing the post- 

 cephalic portion of the skeleton. The original was ob- 

 tained from the Gaskohle (Lowest Permian) of Tfemoana 

 (Pilsen), and is figured by Fritsch in his ' Fauna der 

 Gaskohle,' vol. i. pi. xxxvi. fig. 2. Purchased, 1882. 



R. 373. Two electrotypes from fragments of shale, exhibiting im- 

 perfect skeletons ; the originals were obtained from the 

 Gaskohle (Lowest Permian) of Nyfan (Pilsen), and are 

 figured by Fritsch, op. cit. pi. xxvii. fig. 5, and pi. xlv. 

 fig. 6. Purchased, 1882. 



1 Quart. Journ. Geol. Soc. vol. xviii. p. 238 (1862). 



- Sitz. k. bohm. Ges. Wiss. for 1875, p. 72 (1876).— Withdrawn. 



3 Fauna der Gaskohle, vol. i. pt. iv. p. 160 (1883). 



4 Zeitschr. deutsch. geol. Ges. vol. xxxvii. p. 734 (1885). 



5 Sitz. k. bohm. Ges. Wiss. for 1875, p. 72 (1876).— Stelliosaurus. 



6 Loc. cit. 



7 Fauna der Gaskohle, vol. i. pt. iv. p. 160 (1883). 



