BY GEO. M. THOMSON, F.L.S. 55 



The head is sliort and much narrower and shorter than the 

 succeeding segment, with which it articulates closely ; the eyes 

 are small and are placed quite at the sides of the head. Seen 

 from the front the epistome is slightly arched. The first 

 antennae (fig. 6) are very minute and three- jointed, the third 

 joint being minutely setose at the extremity. The second 

 antennae (fig. 7) are about as long as the head and first three 

 "body segments, they are strongly geniculate; the three- 

 jointed flaggelum is sub-equal in length to the last joint of 

 the peduncle. The mandibles (fig. 8) end in four chitinised 

 brown curved teeth, in addition there stands on the inner side 

 of these a single pale-coloured tooth or tubercle ; the cutting 

 edge inside of the teeth bears three tufts of hair-like setse» 

 the innermost (hindmost) being the longest. The first 

 maxillae (fig. 9) have the outer plate strongly curved on the 

 outer margin, the distal portion of which carries a dense 

 fringe of fine setae ; the end is furnished with seven (or eight) 

 strongly chitinised teeth, which are dark brown in colour; the 

 slender inner plate ends in five weak slightly ciu'ved teeth. 

 The second maxill® (fig. 10), as in other members of the sub- 

 family, have the two plates anchylosed together throughout 

 their length, and have the extremity of the inner margin pro- 

 duced into a brush-like process. The maxillipeds (fig. 11) 

 have the characteristically large basal plate somewhat roundecl 

 on the outer margin, and carrying on the inner extremity a 

 small, nearly square, plate, the rest of the limb not bein^ 

 developed ; outside of, and obliquely placed to this, is the small 

 palp of which the basal joint bears two small processes, while 

 the terminal joint is small and is produced into a slightly 

 fringed pointed apex. The large basal jDlate is always more 

 or less ornamented by dark pigment. 



The uropods (figs. 12 and 13), as seen from below, have 

 their appendages very freely articulated to the basal j)late, 

 the inner and shorter one being placed usually anterior to the 

 outer ; the former has several and the lateral a few small 

 marginal sj^ines. 



The sp>ecies is now recorded for the first time from 

 Tasmania. 



Sub-Fam. Ligiinea. 

 9. Ligia australiensis , Dana. 



This species was found by me in abundance under stones 

 on the beaches in the neighbourhood of Hobart, and several 

 specimens from the same locality were forwarded to me by 

 Mr. Morton. These animals usually occur just above tide- 

 marks, and run with great agility when their hiding places 

 are exposed. 



The species has not been recorded before from Tasmania. 



