288 



COELA CA NTH INI 



numerous dermal rays ; but the endoskeletal supports are preserved 

 only in the shape of peculiar forked bones near the base of the anal 

 and second dorsal fins, and of a bony plate below the anterior dorsal 

 tin. These bones seem to represent the coalesced inner segments of 



Fig. 261. 



Macropoma Mantetli, Ag. ; Cretaceous, England. Restoration of the skull, side-view (A), 

 and ventral view (B) ; left palato-quadrate ami hyoid arch (C). an, angular : eh, ceratohyal ; 

 cl, clavicle ; ct, cleithrum ; d, dentary ; ep, epihyal ; eth, ethmoid ; fr, frontal ; g, paired gular ; 

 h, hyomandibular ; har, parasphenoid ; mx, maxilla; n, nasal; oc, occipital region; op, 

 opercular ; or, orbit ; os, row of supraorbitals ; p, parietal ; pa, palatine ; pmx, premaxilla ; po, 

 postorbital ; pop, preoperculaT ; ]^.t, post-temporal ; pt, pterotic (in A), pterygoid (in Band C) ; 

 q, quadrate; sor, suborbital; sp, splenial; v, vomer. 



the concentrated radials. The paired fins are of the obtusely lobate 

 type. In the only case where the skeleton of the pectoral fin is 

 known, it is in the form of a posterior short basipterygium and 

 four preaxial radii (A. S. Woodward ["288]). The endoskeleton 

 of the pelvic fins is not preserved, excepting for two elongated 

 bones representing the pelvic girdle (Fig. 260). 



