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 



