194 ON SOME NEW AUSTRALIAN MARINE ISOPODA, 



tooth on the lower border of the merus, carpus triangular, 

 elongate, propodos dilated, its digital prolongation with a rounded 

 lobe near the base. Length about ^- an inch. 



Sal. Broughton Islands, dredged in about twenty-five fathoms. 



Genus Paratanais, Dana. 

 Paratanais tenuicornis, sp. nov., Plate IV., fig. 3. 



Antennee short ; inner pair stout, the basal segment about three 

 times as long at the second, and the latter twice as large as the 

 last, which is very small. Outer antenna? more slender than the 

 inner ; last joint smaller than the penultimate, which again is 

 as long as the two preceding taken together. First pair of legs 

 very stout ; propodos curved, dactylos slightly geniculate. Caudal 

 appendages short, flagellum with seven articuli. Length about 

 £ inch. 



Sab. Port Stephens. 



Fam. AKCTUKIDiE. 



Genus Arcturus, Leach. 

 Arcturus longicornis, sp. nov. 



None of the segments of the thorax greatly elongated. Head 

 broader than long, longer than the first segment of the thorax ; 

 frontal border deeply concave. A pair of pointed spinous tubercles 

 on the head, on each segment of the thorax and on each of the 

 first two segments of the abdomen. Terminal segment sub-acute, 

 with a pair of rounded tubercles near its apex. Internal antennas 

 longer than the head ; first segment of the peduncle short and 

 thick, second and third segments sub-equal. Outer antenna) 

 with the peduncle equal in length to the head and thorax — the 

 fifth joint much longer than all the rest together. Length, 

 exclusive of antenna, more than two inches. 



The somewhat mutilated specimen from which the above 

 description was taken was in the Australian Museum collection 

 without locality attached, but pinned on a sheet of cork together 



