288 



COELACANTH1NI 



numerous dermal rays ; but the eridoskeletal 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 

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



PIG. 261. 



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

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

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

 ft, hyoinaudibular ; har, parasphenoid ; mx, maxilla; n, nasal; oc, occipital region; oj>, 

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

 postorbital ; pop, preopercular ; ps.t, post-temporal ; pt, pterotic (in A), pterygoid (in Band C) ; 

 i], 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). 



