76 



FOSSIL FISHES OF THE ENGLISH CHALK. 



articulo-angular shows that the coronoid region of the mandible rose in a gradual 

 slope from the mandibular articulation. The dentary, of which the upper edge is 

 indicated by rad. in Text-fig. 18, seems to have been slender. The gape of the 

 mouth must have been small, and the relatively large inferior limb of the preoper- 

 culum extends forwards to the articulation of the mandible. The operculum (op.) 

 is as deep as broad, rounded behind, and quite smooth on its outer face. 



The number of vertebrae is uncertain, but the type specimen shows at least 

 36 in advance of the pelvic fins. The centra in this specimen are much 

 crushed and imperfect, but they are well seen in PI. XV, fig. 3. They are all 

 deeper than long, and must have been pierced by a large persistent strand of the 



s 9 st 



2§i* 



filv- 



Fig. 18. Enchelurus anglicus, A. S. Woodward; outline-sketch of type specimen, nat. size, showing 

 remains of head from above, abdominal region in left side-view. — Probably from a Cenomanian 

 zone ; Kent. Enniskillen Collection (B. M. no. P. 4249). enpt., entopterygoid ; eth., mesethmoid; 

 ./'/•., frontal; md., mandible; mx., left maxilla; op., left operculum; pa., parietals; plv., pelvic 

 bones; pr/., prefrontal ; sg-., squamosal; st., supratemporal. 



notochord. Their sides are strengthened by several delicate longitudinal ridges. 

 The neural arches in the abdominal region are deep laminar expansions, each 

 bearing a loose, slender spine. Those in the caudal region are less elevated, with 

 a comparatively stout spine firmly fixed to their postero-superior angle. Each 

 haemal arch in the caudal region is fixed to the anterior edge of the centrum. 



A pair of narrow plates, which taper to their point of meeting in the middle line, 

 rest on the occipital border of the type specimen and appear to represent supra- 

 temporals (Text-fig. 18, st.). Only fragments of the pectoral arch are seen. Traces 

 of the pelvic {plv.) and dorsal (do.) fins are seen respectively in Text-fig. 18, and in 

 PI. XV, fig. 3. Otherwise the (ins are unknown. 



Remains of scales in the type specimen prove them to have been rather large, 

 thin, and smooth. 



Horizons and Localities. — Zone of Holaster subglobosus : Grlynde and Amberley, 

 Sussex; probably also Burham, Kent. 



