[377]

J. Müller, Vergl. Anat. d. Myxinoiden, Pt. iii. (1839) Berlin 1841 p. 179.

[378]

T. Jeffery Parker, Phil. Trans. 177, Pt. ii. 1886, p. 686; cf. H. Ayers, Bull. Mus. Comp. Zool. Harvard, xvii. No. 5, 1889, p. 191.

[379]

Chlamydoselachus is more primitive in this respect, and has but a single efferent vessel for the two hemibranchs of each arch, which corresponds with the more anterior of the two in Mustelus (Ayers, op. cit.).

[380]

Cf. footnote to p. [332].

[381]

Note, however, that in the young Lepidosteus there are two efferent vessels in each arch, which, nevertheless, differ from those of Mustelus in uniting to form an epibranchial artery before joining the dorsal aorta (F. W. Müller, Arch. Mikr. Anat. xlix. 1897, p. 463).