[32]

For Vertebrates see Shipley, Quart. J. Micr. Sci. xxvii. 1887, p. 340.

[33]

The largest known eggs are those of Harrimania kupfferi (1.3 mm.). The eggs of Dolichoglossus kowalevskii measure .37 mm., while the youngest Tornaria found by Morgan, already transparent and with their tissues distended by water, were only about two-thirds that size.

[34]

Quart. J. Micr. Sci. xxiv. 1884, p. 208; xxv. Suppl. 1885, p. 81; xxvi. 1886, pp. 511, 535.

[35]

Agassiz, Bourne, Spengel, Morgan (in T. agassizii).

[36]

Morgan (in Balanoglossus biminiensis).