A treatise on zoology . Fio. Tail oiDiplopterus Agussigii, Traill. (AfterTraciuair.) , extremity of axis ; , anallin ; cf, liypochordal fin ; </./, dorsal fin. Carboniferous and 286 OSTEOL EPID O Tl Scotland. )tcrus, Hall. Fig. Ehizodopsis sanroides, Will. Riglit-side view ofhead, lestmed. (.\fter Tiafiuair, from A. ) ag, angular ; d, dentary ; /, frontal;, infradentary ; J, paireil inferior gular ; ,lateral gnlars; , median inferior gular; mx,maxilla ; op, opercular; or, orbit; jif, post-frontal;pmx, premaxilla ; pop, preopercular ; pa, parietal ;

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A treatise on zoology . Fio. Tail oiDiplopterus Agussigii, Traill. (AfterTraciuair.) , extremity of axis ; , anallin ; cf, liypochordal fin ; </./, dorsal fin. Carboniferous and 286 OSTEOL EPID O Tl Scotland. )tcrus, Hall. Fig. Ehizodopsis sanroides, Will. Riglit-side view ofhead, lestmed. (.\fter Tiafiuair, from A. ) ag, angular ; d, dentary ; /, frontal;, infradentary ; J, paireil inferior gular ; ,lateral gnlars; , median inferior gular; mx,maxilla ; op, opercular; or, orbit; jif, post-frontal;pmx, premaxilla ; pop, preopercular ; pa, parietal ;, suborbitals ; , subopereular ; t(, supra-temporals ; sq, pterotic (squamosal); x, :</, cheek-plates. Cricodus, Ag. ; Upper Devonian,Europe and North America,Eiisthenopteron, Whiteavea (); Upper Devonian, , Owen ; Htrepsodus,Young ; Rhizodoims, Young (); Carboniferous, Europe andNorth America. Family Onychodontidae. In-completely known Osteolepidotiwith tubercukited cycloid scales,and mandibular teeth withfolded base, of which some verylarge ones are situated at thesymphysis. Onychodus, Newb.; Devonian,Enirland and North America.

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology