[172]

Hoffbauer, "Die Altersbestimmung des Karpfen an seiner Schuppe." Jahresb. des Schlesischen Fischerei-Vereins, 1899; J. Stewart Thomson, Journ. Marine Biol. Assoc. vi. No. 3, 1902, p. 373.

[173]

Günther, Phil. Trans. clxi. 1871, p. 516; Klaatsch, op. cit. p. 209.

[174]

This portion of the chapter is mainly based on the important researches of Dr. Gadow and Miss Abbott. See Phil. Trans. 186, 1895, p. 163 et seq. where copious references to the work of other writers are given.

[175]

Neuromeres are body-segments defined and limited by the exits of the successive pairs of spinal nerves from the neural canal.

[176]

Gadow, op. cit. p. 190.