[240]

Marine Investigations in South Africa, i. 1902, p. 224.

[241]

Cf. Sollas, Encyclopædia Britannica, 1887, art. "Sponges," and Schrammen, Mitth. Mus. Hildesheim, 14, 1901.

[242]

Sollas, Quart. Journ. Geol. Soc. xxxiii. 1877, p. 790.

[243]

Ridley and Dendy, Challenger Monograph, lix. 1887.

[244]

Ibid. p. 262; cf. also p. [197].