Note 427 — Chapter IX · ON CONCRETIONS, SPICULES, AND SPICULAR SKELETONS
Reading edition
Spicules extremely like those of the Alcyonaria occur also in a few sponges; cf. (e.g.), Vaughan Jennings, Journ. Linn. Soc. XXIII, p. 531, pl. 13, fig. 8, 1891.