Archive image from page 592 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 RUMINANTIA. 517 coronal suture passing transversely across the centre of each osseous expansion, from side to side. The bones are easily detached by maceration (at least in the younger ani- mal), and when withdrawn, there is brought into view an intervening sheath-like perios- teum, which can also be separated from the concavity at the base of the horn. This cup- shaped hollow, owing to the columnar dis- position of the osseous laminae, and the very numerous p
Archive image from page 592 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 RUMINANTIA. 517 coronal suture passing transversely across the centre of each osseous expansion, from side to side. The bones are easily detached by maceration (at least in the younger ani- mal), and when withdrawn, there is brought into view an intervening sheath-like perios- teum, which can also be separated from the concavity at the base of the horn. This cup- shaped hollow, owing to the columnar dis- position of the osseous laminae, and the very numerous perforations for the passage of nutrient vessels, presents the appearance of a sieve, depressed into a conical form. Both in the Cape and Nubian varieties a sexual difference obtains in reference to the extent to which the horns are developed. In the male adults they are larger and more closely approximated at the base than in the females, and, according to Prof. Owen's observations on the horns of the Cape Giraffe, ' their expanded bases meet in the middle line of the skull, so that they would entirely conceal the coronal suture even if it were not early obliterated in this sex.'r The basal portions of the horns in the females are widely sepa- rated. In our specimen (a Nubian male) the internal and lower margins of the horns remain, severally, half an inch apart, and the interfrontal suture is still distinct throughout its entire length. In regard to the asserted existence of a third horn surmounting the anterior central protuberance, an examination of the cranium, above alluded to, only serves to confirm the extended observations and conclusions of Prof. Owen on this subject. We have shown that this elevation is due to an enlargement of the subjacent frontal si- nuses, and in this respect it resembles the posterior horn-shaped apophyses. It must be remarked, however, that although, in our example, there is no superimposed osseous deposit, there is, nevertheless, a cartilagin
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