NOTES ON THE AUSTRALIAN AMPHTPODA. By William A. Haswill, M.A , B.Sc. (Plates X.— XVIII.) I. Talitrus sylvaticus. (Plate X., Fig. I.) Talitrus sylvaticus, Has well, Proc. Linn. Soc, N.S.W., Vol. IV., p. 246, pi. VIL, fig. L Talitrus affinis, Haswell. L.c, Vol. V., p. 97, pi. V., fig. 1. The specimen originally figured was a female. I give here a figure of the posterior gnathopod of the male. 11, Allorchestes. Of the species of Allorchestes common on the coast of New South Wales there are three which are very well marked and distinct. These are A. longicornis, A. crassicornis, and A. rupicola. The first two are entirely unlike any of the three species which have been described by Dana as occurring in Australia. The first, A. longicornis (pi. X., figs. 6-8), is characterised by the extreme length of the inferior antennae, which are as long as the head and pereion, the flagellum being nearly three times as long as the peduncle, and composed of thirty articuli. A. crassicornis, again, (pi. X., figs. 2-5), has the inferior antennae scarcely so long — a little longer than the head and first three segments — but extremely thick both as regards the peduncle and the flagellum ; the latter somewhat longer than the former, composed of twelve
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