Notes on the Australian Amphipoda

Abstract

AUSTRALIAN AMPHIPODA, segments, of which those near the base are very thick. Both peduncle and flagellum are densely fringed with hairs. (1) A. 7-wpicola (pi. X., figs. 9-12) has the antennae of moderate length and thickness, the lower with only twelve joints in the flagellum, and has a prominent rounded process on the carpus of the anterior gnathopoda, such as occurs also in A. crassicornis. It is possible that Dana's Allorchestes humilis may be a young foi'm of this species, but there is nothing in his description or figure to indicate that his species had the characteristic features which I have described. A. niger (pi. XI., figs. 1-3) is distinguished from A. rujncola only by the form of the anterior gnathopoda, and by having the inferior antennae relatively longer, with 21-23 joints in the flagellum. A. Gaimai'dii, Dana, is characterized by the union of the proximal articuli of the inferior antenme into one piece, which appears like an additional segment of the peduncle. A. australis, which Dana describes as being found at lllawai-ra, I cannot identify with any of the species I have seen. The description and figure most nearly resemble A. rupicola, but with well-marked difl'erences. III. Neobule algicola.