PLATE XII. 
Pig. - Page 
1. Hybodus bcisanus, Egerton ; head, left lateral aspect, one 
half nat. size.—Wealden ; Pevensey Bay, Sussex, md. 
Left ramus of mandible. Left pterygo-qnadrate. 
[P. 2082.] 274 
2. Ditto ; portion of inferior aspect of head, one half nat. size. 
—Ibid. bhy. Basihyal. chy. Ceratohyal. md. Inferior 
margin of mandible. [P. 2082 a.] 274 
3. Ditto ; branchial arches of left side, inferior aspect, one 
half nat. size.—Ibid. brd-brd Series of branchial 
arches. [P. 2032.] 274 
4. «, b. Ditto ; four upper and four lower teeth, anterior aspect, 
restored from various specimens, the larger examples 
being the more anterior. 273 
« 
5. Ditto ; imperfect dorsal fin-spine, lateral aspect.—Wealden ; 
Hastings. [P. 2833.] 275 
6. Synechodusdubrisiensis (Mackie); vertebrae.—Chalk; Kent. 
[49032.] 328 
7. Synechodus , sp. • tooth, anterior aspect. — U. Chalk; Nor¬ 
wich. [48954*] 330 
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