[43] Mackerel, like other marine fishes, birds, and mammals of prey, follow the shoals of young and adult Clupeoids in their periodical migrations; on the British coasts it is principally the fry of the Pilchard and Sprat which wanders from the open sea towards the coast, and guides the movements of the Mackerel.
[44] The systematic affinities of these extinct genera are very obscure. Cope places them, with others (for instance Protosphyræna, which has a sword-like prolongation of the ethmoid), in a distinct family, Saurodontidæ: see “Vertebrata of the Cretaceous Formations of the West,” 1875.
[45] For specific characters and detailed descriptions we refer to Günther, “Catal. of Fishes,” vol. vi.
[46] The names “Bull-trout” and “Peal” are not attributable to definite species. We have examined specimens of S. salar, S. trutta, and S. cambricus and S. fario, to which the name “Bull-trout” had been given; and that of “Peal” is given indiscriminately to Salmon-grilse and to S. cambricus.
[47] Fig. 317 is taken from a specimen in which the horny covers of the dentition were lost, hence it does not represent accurately the shape of the teeth.
[48] This name is two years older than Amphioxus.
Transcriber’s Notes:
1. Obvious printers’, punctuation and spelling errors have been corrected silently.
2. Where hyphenation is in doubt, it has been retained as in the original.
3. Some hyphenated and non-hyphenated versions of the same words have been retained as in the original.