34 A. O. WALKER. 
cient for the establishment of a new species. The hind margin of the third pleon 
segment above the upturned angle is almost straight; the whole lower margins of the 
first side-plates are serrate ; the hand of the first gnathopods is considerably longer than 
the wrist, in proportion of six to four, and the divisions of the telson are smooth and 
rounded at the tips. 
FAM. ATYLIDA, G. O. Sars. 
ATYLUS WALKERI, Stebbing. 
Atylus antarcticus, A. O. Walker. 
Atylus walkeri, Stebbing. 
W.Q., 31 Jan., 1902, Hut Point, 3 fm., several; 18 Mar., 1902, 10 fm., four; 
28 Nov., 1902, one. 
Length, 15 mm. 
FAM. DEXAMINIDA, Srepsrne. 
POLYCHERIA ANTARCTICA. 
Dexamine antaretica, Stebbing, Ann. and Mag. Nat. Hist. XV. (1875), p. 184. 
Polycheria antarctica, Stebbing. 
W.Q., 30 Sept., 1903, Hole 12, D net, six ; length 6 mm. 
This species was described by Mr. Stebbing, in 1875, from three small specimens 
found in a sponge dredged up by Sir J. Ross a few miles to the E. of the ‘ Discovery’s ’ 
Winter Quarters. The specimens were not in good condition, or, probably, full-grown, 
so that the description is not as satisfactory as it might otherwise have been. Mr. 
Stebbing informs me that he has now united his 7riteta Kergueleni with this species. 
The present specimens agree with the description of 7. Kergueleni, except in the 
following features: the side-plates of the first gnathopods are subquadrate, not 
produced in front; the posterior angle of the third pleon segment is produced, and 
acute; the margins of the telson are without spines; and the inner plate of the first 
maxillee has two sete. 
Polycheria tenuipes, Haswell, P. brevicornis, Haswell, and P. obtusa, Thomson, 
have been referred to this species. The description and figure of the second gnathopod 
of the first of these, and the description of the same limb in the second, are quite unlike 
that of P. antarctica (Proc. Linn. Soe. N.S.W., Vol. IV., 1880, pp. 345-6, Pl. XXII, 
fig. 8¢.). 
MELPHIDIPPA MACRURA. 
Melphidippa macrura, G. O. Sars. 
Jan. 27, 1902, 300 fm., one; length to end of telson 25 mm. 
The specimen which, with the exception of the loss of the third uropods, was in 
excellent preservation and was therefore not dissected, agrees with Sars’ description 
