A treatise on zoology . by Huxley as an exoccipital, the only endochondral ossificationin the skull of living Dipnoi, appears to represent the first of the ^36 DIPNOI occipital neural arches, since it is placed l^etween the hypoglossaland the first occipitospinal nerve (Fiirbringer [lllft]). The chondrocranium, complete, thick, and without fontanellesin Ceratodus (Fig. 206), is less complete in the Dipneumones,. Kic. 2oii. Cemtodtis Fomter!, Kictlt. A, outer view of left half; U, imiei view of right half. (?,angular;hh, basihyal; hr, tifth branchial arch; ch, ceratohyal; , cranial rib; d, d
A treatise on zoology . by Huxley as an exoccipital, the only endochondral ossificationin the skull of living Dipnoi, appears to represent the first of the ^36 DIPNOI occipital neural arches, since it is placed l^etween the hypoglossaland the first occipitospinal nerve (Fiirbringer [lllft]). The chondrocranium, complete, thick, and without fontanellesin Ceratodus (Fig. 206), is less complete in the Dipneumones,. Kic. 2oii. Cemtodtis Fomter!, Kictlt. A, outer view of left half; U, imiei view of right half. (?,angular;hh, basihyal; hr, tifth branchial arch; ch, ceratohyal; , cranial rib; d, dentary; eo, exoceipital; hm, hyoniandibular ; , hyomanflibulaV nerve : hr, hypohyal; , lateral plate ;, median anterior, and , median posterior plate ; , neural arch ; , cartilage ofneural arch ; , not>ochordal sheath ; , neural spine ; vt, notochord ; o, opercular, and oc,Its cartilage ; pu, parasphenoid; pif, jiostfrontal; , pterygo-palatine; , palatine tooth ;pto, pterotic (?); and q, its downwaid process covering the quadrate cartilage, ; s, sub-opercular; so, suborbital; up, splenial; , splenial tooth ; , vomerine tooth. where the trabeculae remain recognisable, and the wall of the brain-case is to some extent formed In membrane l»ones above, beloAv,and at the sides (Fig. 209). The cavity of the auditory capsuleis widely open to the interior as in Tel
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
