. On the anatomy of vertebrates [electronic resource] . lla or4 stapes is a distinct ossicle, between 2 and 25,fig. 43 ; as is also the 4 hypotympanic articulation,ib. 29, for the mandible, 30, 32. The neurapophysesof the third segment, 4 orbitosphenoid, figs. 42 and Incipient ossification #» ,i i .i , • . n , of the skuii. Larva 43, io, perforated by the optic nerves, are ossmedof nog (i?tma) cartilaginous basis, as are those of the fourth segment (prefrontals), figs. 42, 44, 68, u, perforated bythe olfactory nerves; whilst those of the second segment, 4 ali-sphenoids, ib. 6, perforated by th
. On the anatomy of vertebrates [electronic resource] . lla or4 stapes is a distinct ossicle, between 2 and 25,fig. 43 ; as is also the 4 hypotympanic articulation,ib. 29, for the mandible, 30, 32. The neurapophysesof the third segment, 4 orbitosphenoid, figs. 42 and Incipient ossification #» ,i i .i , • . n , of the skuii. Larva 43, io, perforated by the optic nerves, are ossmedof nog (i?tma) cartilaginous basis, as are those of the fourth segment (prefrontals), figs. 42, 44, 68, u, perforated bythe olfactory nerves; whilst those of the second segment, 4 ali-sphenoids, ib. 6, perforated by the trigeminal, longer remaingristly. All the chondrogenous elements are thick bones. From the membranous basis of the skull are developed thefollowing bones, which are more or less lamelliform. The basi-occipito-sphenoidal plate, fig. 73, m, forms the base of the skullfrom the condyles to the vomerine cartilage. The mastotym-panic, fig. 43, 25, fig. 44, 8, 25, fig. 68, 8, extends from themastoid cartilage, where it is broadest, to the outside of the. ANATOMY OF VERTEBRATES. 87 69 69a
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