. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Skull of Boa Constrictor. they are not on that account less the repre- sentatives of the intervertebral foramina pro- perly so called. The mere circumstance of the channels of some of these nerves being, in the human subject and in other Mammifera, cir- cumscribed by rings of bone and thus con- verted into distinct foramina, to which special names have been given by the human osteo-. Section of skull of Boa. legist, militates in no degree asainst the grand fact that it is between the cranial vertebras they all make their
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Skull of Boa Constrictor. they are not on that account less the repre- sentatives of the intervertebral foramina pro- perly so called. The mere circumstance of the channels of some of these nerves being, in the human subject and in other Mammifera, cir- cumscribed by rings of bone and thus con- verted into distinct foramina, to which special names have been given by the human osteo-. Section of skull of Boa. legist, militates in no degree asainst the grand fact that it is between the cranial vertebras they all make their exit. Having given the above general view of the composition of the osseous skeleton, a more difficult task now remains to be accomplished, viz. to identify and compare with each other the individual bones entering into the com- position of the osseous system throughout the different vertebral classes, and thus to analyse the entire fabric. Various and conflicting in- deed are the opinions of different writers on this important subject, of whose names and works an ample list will be given in the Biblio- graphy affixed to the end of this article; but to enter into the argumentation of disputed points would of course be impossible in our prescribed limits. Suffice it to say, that the views of the acute and sound-judging Cuvier have been principally adhered to, and where occasion has been found to dissent from his opinion we have expressed our reasons for so doing.* Bone* of the cranium.— Frontals (1). These bones in fishes form the roof of the orbit and the anterior portion of the cranial box, having in front and behind them other pairs of bones forming the anterior and posterior boundaries of the orbit which correspond with the ante- rior and posterior frontals in Reptiles. In the Frog the whole of the anterior portion of the cranium is made up of a single bone, which entirely surrounds it like a ring or girdle, and represents the two frontal bones of Serpents * We must here
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