. On the anatomy of vertebrates [electronic resource] . is is called e ceratohyal,ib. 40. The haemal spine is subdivided into four stumpy bones,called collectively basihyal, ib. 41; and which, in most fishes,support a bone directed forward, entering the substance of thetongue, called f glossohyal, ib. 42; and another bone directedbackward, called e urohyal, ib. 43. The ceratohyal part of the haemapophysis supports an appendage,or rudimental limb, called i branchiostegal, fig. 81, 44, answeringto the pectoral fin diverging from the haemal arch, in the adjoiningoccipital segment. The penultimate
. On the anatomy of vertebrates [electronic resource] . is is called e ceratohyal,ib. 40. The haemal spine is subdivided into four stumpy bones,called collectively basihyal, ib. 41; and which, in most fishes,support a bone directed forward, entering the substance of thetongue, called f glossohyal, ib. 42; and another bone directedbackward, called e urohyal, ib. 43. The ceratohyal part of the haemapophysis supports an appendage,or rudimental limb, called i branchiostegal, fig. 81, 44, answeringto the pectoral fin diverging from the haemal arch, in the adjoiningoccipital segment. The penultimate segment of the skull above described is calledthe f parietal vertebra; the neural arch is called e mesencephalic;and the haemal arch is called 6 hyoidean in reference to its sup-porting and subserving the movements of the tongue. The next segment, or the second of the skull, counting back-ward, can be detached from the foremost segment without dividingany bone. It is then seen to consist, like the third and fourth VOL. I. H 98 ANATOMY OF Disarticulated prosencephala arch, Cod(Morrlma vulgaris) segments, of two arches and a common centre; but the consti-tuent bones have been subject to more extreme centrum, called 6 presphenoid, fig. 79, 9, is produced farforward, slightly expanding; the neurapophyses, called orbito- sphenoids, ib. 10, are small semi-oval plates, protecting the sides ofthe cerebrum; the neural spine, orkey-bone of the arch, called 6frontal,ib. n, is enormously expanded, butin the Cod is single; the diapophyses,called post-frontals, ib. 12, projectoutward from the hinder angles ofthe frontal, and give attachment tothe piers of the inverted haemal first bone of this arch is com-mon in Fishes to it and to that of thelast described vertebra, being thebone called ( epitympanic, fig. 81, 25;this modification is called for by thenecessity of consentaneous move-ments of the two inverted arches, inconnection with the deglutition
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