Phreatogammarus fragilis (Chilton).

Gammarus fragilis, Chilton in N.Z. Journ. Sci., vol. i, p. 44 (1882), and Trans. N.Z. Inst., vol. xiv, p. 179, pl. ix, figs. 11-18. Gammarus fragilis, Chilton in Trans. Linn. Soc. London, ser. 2, vol. vi, p. 227, pl. xxi, figs. 1-25 (1894). Phreatogammarus fragilis, Stebbing in “Das Tierreich Amphipoda,” p. 454 (1906).

This species is found in the underground waters of Canterbury Plains, and has been already fully described in my paper in the Trans. Linn. Soc. London quoted above. Its special characteristic is the possession of very long antennae, peraeopods, &c., and in this respect it resembles several other subterranean species from other parts of the world.