AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 501 
Genus Mara Leach, 1813. 
Mera mastersw (Haswell). 
Megamera mastersit Haswell, 1880a, p. 265, pl. xi. fig. 1. 
Py} thomsont Miers, 1884, p. 318, pl. xxxiv. fig. B. 
Mezra mastersit Stebbing, 1906, p. 439. 
7 » Chilton, 1911, p. 594. 
South Africa, entrance to Saldanha Bay, Station 483; 25 fathoms. Five 
specimens, the largest 10 mm. long. 
Although they show some differences, I think these specimens may be referred to 
this species. On the whole they agree fairly well with HasweE..’s description ; and if 
the form described as Megamera thomsom by Mrnrs really belongs here, the species is 
evidently a variable one. My specimens differ from the description given by SrEBBine 
in Das Tierreich in the following points :—The third segment of the pleon has the 
posterior angle produced so as to be acute, but the hind margin is hardly denticu- 
late ; the eyes are small, almost round ; in the upper antenna the first joint has a stout 
spinule at its lower distal margin, the accessory flagellum contains seven joints; the 
flagellum of the second antenna is considerably longer than the last joint of the 
peduncle. In the first gnathopod the carpus and propod are hardly slender, each 
having the posterior margin convex and agreeing fairly well with HasweE r’s description ; 
this appendage shows considerable resemblance to that of Hlasmopoides chevreuaxr 
Stebbing, but the carpus and propod have the hind margins less strongly convex than 
in that species. The second gnathopod agrees well with the description. The third, 
fourth, and fifth perzeopoda are fairly stout, the basal joint has the hind margin only 
finely serrated. The uropoda and the telson agree well with Haswe.i’s description. 
The specimens are colourless (in spirit) and do not show the light yellowish-brown 
colour mentioned by SrEeBBING, which was present in the Kermadec Island specimens I 
examined in 1911. In the rather stout perzeopoda and in some other points they 
have rather the appearance of an Hlasmopus. 
This species is widely distributed in the warmer southern seas. 
Genus PARADEXAMINE Stebbing, 1899. 
Paradexamine pacifica (G. M. Thomson). 
Dexamine pacijica G. M. Thomson, 1879, p. 238, pl. x.z, fig. 4. 
Paradexamina pacifica Stebbing, 1906, p. 518. 
i " Chilton, 19094, p. 632. 
Paradexamina fissicauda Chevreux, 1906z, p. 88, figs. 51--53. 
South Orkneys, Station 325; 9-10 fathoms. April and May 1903. Four 
specimens, the largest 17 mm. long. 
