DR. W. M. TATTERSALL : AMPHIPODA AND ISOl'ODA. 9 
6. M^RA MASTERSii {HaswelT). 
Megam<sra mastersii, Haswell, 18b0 (1), p. 266, pi. 11. tig. 1. 
M. thompsoni, Miers, 1884, p. 318, pi. 34. fig. B. 
Mcera mastersii, Stebbiug-, 1906, p. 439. 
Olievreux, 1907, p. 481. 
„ „ Stebbiug, 1910 (1), p. 642. 
„ Chilton, 1911, p. o64. 
„ „ Barnard, 1916, p. 195. 
Chilton, 1918, p. 367. 
Localiti/. Sandjr Island, Wallaby Group, one male, 5 mm. 
Distribution. Port Jackson, Australia (Haswell) ; several localities in the 
Torres Strait (Miers) ; Gambier Archipelago (Chevrenx) ; Kermadec 
Islands (Chilton) ; Mozambique (Bai-nard) ; New Zealand (Thomson & 
Chilton). 
Genus Elasmopus, ^i. Costa. 
7. Elasmopus subcarinatus {Haswell). 
Megumcera siihcarinatu, Haswell, 1880 (2), p. 335, pi. 21. tig. 4. 
Elasmopus suhcarinatus, Chilton, 1915, p. 321, tigs. 1-6. 
Locality. Dredged off Wallaby Group, one male, 6 mm. 
Distribution. Shores ot New Zeahind, Australia, Ceylon, South Africa, 
and Indian Ocean. 
Remarks. Chilton, in the paper quoted above, has given a full account and 
synonymy of this species and of its geographical distribution. The species 
is distinguished fiom its congeners by the tvs'O carinse of the fourth segment 
of the pleon each ending in a prominent tooth. In this character my 
specimen agrees with the type, but it differs from typicnl specimens as 
described by Chilton in the following characters : — 
(1) In the first antenna?, which are much shorter than usual and have 
only fifteen joints in the flagellum. The accessory appendage is 
quite short and only has two joints. A^alker recorded specimens 
from Ceylon in which the accessory appendage of the first antenna 
was only two-jointed. 
("2) In the hinder margin of the second joint of the last pair of 
perfeopods, which is closel)' and coarsely pectinate as described 
for the species E. pectenicrus, Sp. Bate. Chilton says of all the 
perseopods that the " basal joint posterior margin simply 
serrate," while Stebbing says that the margins are " strongly 
serrate." But the condition in the present specimen agrees with 
Walker's description in E. serrula ( = E. pectenicrus) : "the 
greater part of the hind margin elegantly cut into flat-topped 
