254 ON AUSTRALIAN AMPIIIPODA. 



pereion ; first joint of the peduncle as long as the cephalon ; 

 second and third joints short ; flagellmn longer than peduncle, of 

 about thirty segments ; appendage of seven segments. Inferior 

 antenna) with the peduncle nearly equal in length to that of 

 superior pair ; flagellmn longer than peduncle. Mandibles with 

 a three- jointed palp ; cutting edge produced at each end ; a 

 pointed tubercle on the outer border in front of the insertion of 

 the palp ; squamiform plate bordered with short spines. First 

 pair of maxilla) having the two internal plates armed with a 

 number of compressed chitinous teeth, each furnished at its 

 extremity with a series of denticulations. Palp of maxillipedes 

 non-unguiculate. First pair of gnathopoda slender ; the carpus 

 and propodos narrow, the latter tapering towards its distal end. 

 Second pair rather stouter ; carpus cylindrical ; propodos long, 

 narrow, its lower border convex its upper straight ; palm trans- 

 verse, dactylos short. Anterior pereiopoda subequal. Meros, 

 carpus and propodos of posterior pereiopoda serrated. Rami of 

 fourth and fifth pairs of pleopoda styliform, slightly curved at 

 the extremity, the inner ramus of the fifth pair rather longer and 

 broader than the outer. Sixth pair of pleopoda a little shorter 

 than fifth ; the rami lanceolate, with smooth borders and slightly 

 curved at the tip. Telson squamiform, deeply cleft. 



Length nine-and-a-half lines. 

 Kab. Tasmania (M.-M.) 



Amaryllis brevicornis, sp. nov. 

 This species is nearly allied to the preceding, being distinguished 

 from it mainly by the greater shortness of the antennse, which 

 are not longer than the cephalon and first three segments of the 

 pereion ; the flagellum of the superior pair containing only 

 eighteen articuli, and the appendage five. 



Length four lines. 



JLib. Port Jackson. Common among alga3 and polyzoa in the 

 sub-littoral zone. 



