[187]

As additional primary cranial elements mention may be made of a pair of independently developed "alisphenoid" cartilages, which lie in front of the parachordals between the brain and the eyes, and above the trabeculae, and form a considerable part of the inter-orbital region of the cranium. See Sewertzoff, Anat. Anz. xiii. 1897, p. 413; ibid., Kupffer Festschrift, Jena, 1899, p. 281.

[188]

W. K. Parker, Trans. Zool. Soc. x. 1878, p. 189.

[189]

Huxley, P.Z.S. 1876, p. 40.

[190]

W. K. Parker, Phil. Trans. 163, 1873, p. 95.

[191]

M‘Murrich, Proc. Canadian Inst. (N.S.) ii. Toronto, 1884, p. 278; Cole, Trans. Linn. Soc. vii. Pt. v. 1898, p. 131.