[162]

Klaatsch has since affirmed the epidermic origin of the scleroblasts, ibid. xxi. 1894, p. 153.

[163]

Klaatsch, Morph. Jahrb. xvi. 1890, p. 125; Nickerson, Bull. Mus. Comp. Zool. Harvard, xxiv. 1893, p. 115.

[164]

Ryder, Proc. Acad. Nat. Sci. Philadelphia, 1892, p. 219; Smith Woodward, Nat. Sci. iii. 1893, p. 448.

[165]

Smith Woodward, op. cit. p. 449.

[166]

O. Hertwig, Morph. Jahrb. ii. 1876, p. 374; Klaatsch, xvi. 1890, p. 146.