OCR Text |
Show 1899.] OSTEOLOGY OF THE TUBINARES. 411 fossa?, the backward position of the squamoso-parietal wings, the sagittal crest, coronal ridge, and large supraorbital grooves and lachrymals. Fig. 2. The skull of Prion vittatus, nat. size (p. 389), to show the great development of the upper jaw, the form of the supraorbital grooves, the cerebellar prominence, temporal fossae, and fused lachrymals. Fig. 3. Skull of Procellaria pelayica, nat. size (p. 404), to show the feebly-developed supraorbital grooves and the great width of the interorbital region of the frontals. Fig. 4. The skull of Cymodroma melanoyaster, nat. size (p. 404), to show the form of the supraorbital grooves, the spine-like wings of the free end of the squamosal, and the lachrymals, which are partly separated from the frontals by a space. Fig. 5. The skull of an Albatross, Diomedea exulans, $ nat. size (p. 404), to show the great size of the supraorbital groove and ledge, and the shallow femoral fossae, confined to the lateral surface of the cranium. Fig. 6. The skull of Oceanites oceanicus, nat. size (p. 404), to show the form of the supraorbital grooves. PLATE XXIII. Additional Letters. afe. = alisphenoid. m. = meatus internus. a.o.p.= antorbital process. mes. = mesethmoid. »»*!.== antrum of Highmore. op. = opisthotic. an.h.= „ „ „ p. - parietal. b.p. - basipterygoid process. pa. - palatine. i"!jj. = basiteinporal platform. par., pr. = parasphenoid. /•.s. = basisphenoid. pn.ap. - pneumatic aperture. c.b.v. = cerebral vein. ^ro. = prootic. eu.y. -\-pn.ap. = Eustachian groove + pt. - pterygoid. pneumatic aperture. s.o. = supraoccipital. ep.o.=epiotic. s.s. = squamosal spine. ex.=exoccipital. s2,-==S(luamosak f.f.= floccular fossa. t.r. = temporalis recess. fr.= frontal. v=vomer. A.^. = hemipterygoid. v.f. - vagus foramen. Fig. 1. Lateral aspect of skull of nestling Oceanodroma leucorrhoa, outer X 2 (p. 393), to show the unclosed sutures. Fig. 2. Lateral inner view, longitudinal section, of same skull (fig. ]), x2, to show unclosed sutures. Fig. 3. Dorsal aspect of palatines, pterygoid, and vomer, x 2 (p. 396), to show the form and relations of the hemipterygoid. Fig. 4. Lateral aspect of a portion of fig. 3, x3, outer view, to show relations of hemipterygoid. Fig. 5. Ventral aspect of Pelecanoides yamoti, nat. size (p. 383), to show the form and great size of the basitemporal platform. Fig. 6. Dorsal aspect of the vomer and neighbouring parts of the skull ol Diomedea exulans, f nat. size (p. 390). Fig. 7. Lateral aspect of same dissection as fig. 6, to show form of vomer \ nat. size (p. 391). Note in figs. 6, 7, and 8 the antrum of Highmore. Fig. 8. Ventral aspect of skull of Diomedea exulans, to show the schizoguathous palate, | nat. size (p. 390). |