[257]

Edinger, op. cit. p. 678.

[258]

T. Jeffery Parker, op. cit. p. 55.

[259]

Archiv f. mikr. Anat. xiii. 1876.

[260]

Krukenberg, quoted by Miss Alcock, Journ. Anat. and Phys. xiii. (N.S.), 1899, p. 613.

[261]

Stannius, Handb. d. Zool., Berlin, 1854, ii. p. 201; Owen, op. cit. p. 425.