[260]

Maas, loc. cit. p. 284.

[261]

J. Coll. Japan, xv. 1901, p. 180.

[262]

Perkins, Johns Hopkins Univ. Circ. xxi. 1902, p. 87.

[263]

For details of this interesting process see Minchin, Quart. J. Micr. Sci. xl. 1898, p. 469.

[264]

Maas, Zeitschr. wiss. Zool. lxvii. 1900, p. 225.