96 NOTES ON THE 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. 



(Plate XI., figs. 4-6. 



Neohule algicola, Haswell, Proc. Linn. Soc, N.S.W., Vol. IV., 

 p. 255, pi. VIIL, fig. 4. 



Rathke's genus Hyale, which is placed by Dana in the " Lysia- 

 nassinoe," is seemingly nearly related to Neohule, having the last 

 pair of pleopoda double-branched, but otherwise resembling Nicea. 

 It may be, therefore, that, if Hyale should prove to possess the 

 arrangement of the gnathites characteristic of the Orchestidse, 

 Neohule will require to be united with it. 



(1) The species described and figured by Mr. Chas. Chilton as Allorchestes 

 crassicornis is not this species but the female of Talorchcstia quadrimana, 

 Dana ; (Proc. Lm. Soc, N.S.W., Vol. IX., p. 1035, pi. XLVL, fig. 1.) 



