Note AJ — GLOSSARY OF TECHNICAL TERMS USED IN PART I. (continued 2)

Potts's Spongilla novæ-terræ from Newfoundland and N. America cannot belong to this genus although it has similar flesh-spicules, for, as Weltner has pointed out (op. cit. supra p. 126), the gemmule-spicules are abortive rotulæ. This is shown very clearly in the figure published by Petr (Rozp. Ceske Ak. Praze, Trída, ii, pl. ii, figs. 27, 28, 1899), who assigns the species to Heteromeyenia. Weltner places it in Ephydatia, and it seems to be a connecting link between the two genera. It has been suggested that it is a hybrid (Traxler, Termes. Fuzetek, xxi, p. 314, 1898).