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The Vertebrate Skeleton

Sidney H. Reynolds

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Book Excerpt: 
. . .In front of these are a pair of deep pits, the nasal fossae, at the base of which are a pair of foramina through which the olfactory nerves pass out; they communicate with a space, the middle narial cavity, seen in a longitudinal section of the skull.

The long cartilaginous snout is more or less bifid in front, especially in the male (fig. 9).

Posterior end of the Cranium.

The foramen magnum forms a large round hole leading into the cranial cavity, and is bounded laterally by the two exoccipitals and below by them, and to a very slight extent by the basi-occipital, the three bones together forming a concave occipital condyle by which the vertebral column articulates with the skull.

The exoccipitals are connected laterally with a fourth pair of auditory bones, the opisthotics, and just meet the epi-otics dorsolaterally, while dorsally they are separated by a wide tract of unossified cartilage from the supra-occipital.

The op. . . Read More