Chilton. — Some Australian and New Zealand Gammaridae. 365 



divided by a small projection. Again, in a specimen from Port Jackson 

 sent to me many years ago as M. viridis by Professor Haswell, the palm 

 (fig. 4) is much more projecting, and has the central notch much deeper 

 and wider, extending almost to the base of the finger. In the Lord Howe 

 Island and Port Jackson specimens the propod is nearly free from setae, 

 while in the New Zealand specimens there are short tufts along both 

 anterior and posterior margins ; there are also equally marked differences 

 in the structure of the finger. 



Maera quadrimana Dana, described from specimens collected at the Fiji 

 Islands, is evidently very closely allied to M. viridis, and may prove to be 

 identical with it. Both species were united with M. inaequipes by Delia 

 Valle in 1893. 



Maera ratkbunae Pearse (1908, p. 29) as further described by Kunkel 

 (1910, p. 46) is also very near to M. viridis, and may prove indentical 

 with it. 



Maera inaequipes (A. Costa). Figs. 5 and 6. 



Amphithoe inaequipes A. Costa in Hope's Catal. Crost. Ital., 1851, p. 45, 

 Maera quadrimana G. M. Thomson, 1882, p. 235, pi. 17, fig. 4a 

 (part). Maera truncatipes Delia Valle, 1893, p. 725, pi. 1, fig. 2, 

 and pi. 22, figs. 26-40 (part) ; Miers, 1884, p. 569. Maera hiron- 

 dellei Chevreux, 1900, p. 84, pi. 11, fig. 1. Maera scissimana 

 Walker, 1904, p. 273, pi. 5, fig. 32. Maera inaequipes Stebbing, 

 1906, p. 435, and 1910a, p. 599 ; Kunkel, 1910, p. 44. 



Specific Diagnosis. 



Dorsal surface of body smooth. First side plate with front comer 

 produced, acute. Third pleon segment with posterior margin smooth, 

 inferior margin smooth or obscurely serrate posteriorly, angle acute, 

 slightly produced. Eyes round. First antennae with flagellum about the 

 same length as peduncle, accessory flagellum about half as long. Second 

 antennae with flagellum subequal to ultimate joint of peduncle. First 

 gnathopod with depression in anterior border of carpus, inner surface of 

 carpus with numerous oblique rows of setae arranged as in fig. 5, gn^ . 



Second gnathopod large in both sexes, palm somewhat oblique, defined 

 by an acute tooth, convex and serrulate or irregularly toothed in the female, 

 more toothed and usually with a deep central notch in the male. Third 

 uropod with rami subequal, considerably longer than the first and second. 

 Telson deeply cleft, each lobe bidentate, the inner tooth being longer than 

 the outer. 



Of this species I have specimens from the following New Zealand 

 locaUties : Paterson Inlet, Stewart Island (these are some of the specimens 

 referred to M. quadrimana by C M. Thomson in 1882) ; Chatham Islands, 

 Miss S. D. Shand. 



Distribution. — The species has long been known under various names 

 from the North Atlantic and the Mediterranean, and has been recorded 

 from the Indian Ocean by Walker, and more recently from Australia by 

 Stebbing. 



I feel fairly confident that the New Zealand specimens rightly belong 

 to this widespread species. It appears to be very closely allied to M. 

 viridis Haswell, and, as in that species, it has the characteristic depression 



