Jassa falcata Montagu.

Cancer (Gammarus) falcatus Montagu, 1808, Trans. Linn. Soc., vol. 9, p. 100, pl. 5, fig. 2. Podocerus validus Thomson and Chilton, 1886, p. 143. Jassa pulchella and Jassa falcata Stebbing, 1906, pp. 654, 656. J. falcata Sexton, 1911, p. 212; Chilton, 1912, p. 511; Stebbing, 1914, p. 371.

This species had been collected in New Zealand by Thomson about the year 1885, and identified with Dana's Podocerus validus from Rio de Janeiro. About the same time I had obtained numerous specimens from a buoy in Lyttelton Harbour, and had figured both male and female forms. The species has proved to be specifically identical with Jassa falcata, originally described by Montagu from the south coast of England, and now known to be very widely distributed both in northern and southern seas. There are probably two forms of the male, both different from the female, and the immature stages in the development of the adult male characters have led to much confusion and multiplication of species. Fuller accounts will be found in Mrs. Sexton's paper quoted above and in my report of the Amphipoda of the “Scotia” Expedition (1912, p. 351).

8—Trans.