Marine Copepods from Western Australia, Series II. 
211 
Distal segment of the fiftli leg with almost parallel margins, ami more 
than twice as long as wide ; it bears 3 terminal setae, the middle one longer 
tlian the other 2 ; 2 external lateral setae, each shorter than the terminals, 
the proximal being within the distal half of the segment. Proijortional lengths 
of the abdominal segments and caudal rami 73 : 37 : 28 : 1 1 : 1 7. Genital 
segment deeply clett ; caudal rami divergent, sliizhtly wider at the base than 
long : the outer marginal seta barely within the distal half ; 4 terminal and 
1 small dorsal setae. 
M ale . — Un known . 
This species most nearly resembles M. hippohjtes (Kroyer, 1863),. a 
northern cold-water species (Greenland and Norway), and M. australis (Scott, 
1912), a southern cold-water species (South Orkneys and South Georgia). 
It differs from M. hippoltifes in (a) the relative lengths of the segments of 
the first antennae, (b) the setae of the second basal segment of the mandible, 
(c) the setae of the inner lobe of the first maxilliped, (d) the relative lengths 
of the 2 proximal segments of the emlopod of the first legs, (e) the setation of 
the swimming legs and, (f) the shape and setation of the fifth legs. In addition 
to the points (a), (b), and (e) above, it difiers from M. australis mostly in 
the presence of a distal lobe on the first maxilliped, the shay.ie of the fifth 
legs, and the length of the caudal rami to the anal segment (in M. austrahs 
“ about as long as the last abdominal segment,” Scott). 
It may be recognised by tlie almost parallel margins of the fifth legs, 
the proportions of the endopod segments of the first legs, and the single largo 
seta on the second basal joint of the mandible. 
REFERENCES. 
Dakin, W. J., and Colefax, A. N. Plankton of the Coastal Waters off New South Wales, 
Pt. I. 1940. 
Karawiew, W. “ Contributions to the Copepod fauna of the Black Sea ” (title translated 
from Russian). Zapinski Kiev Obskch., XIV. 1895. 
Lang, K. “ Uber die Gattungen Psamathe Philippi, 1840 und Machairo()us Brady, 1883, 
etc.” Zool. Anz. Bd. 114 Heft 1/2. 1936a. 
Lang, K. Swedish Antarc. Exped., 1901-1903, iii, 3. 1936b. 
Mori, T. “ New Copepods from the southern waters of Jajjan.” Dobuis. Zusshi Tokyo, 44. 
1932. 
Nicholls, A. G. “ Littoral Copepoda from South Australia (1) Harpacticoida.” Hec, of 
the S. Aust. Mus. Vol. VI., No. 4. 1941. 
Scott T “ On the Entomostraca of the Scottish National Antarctic Expedition.” Tran-'-. 
Hoy. So'. E(Un., XLVIIL (3). 1912. 
