Cuitton.—Some New Zealand Amphipoda. 269 
Some New Zealand Amphipoda: No. 4.* - 
By Cuas. Онптох, M.A., D.Sc., LL.D., &c., Professor of Biology, Canter- 
bury College, N.Z. 
[Read before the Philosophical Institute of Canterbury, 6th December, eri received by 
Editor, 31st December, 1922 ; issued separately, 18th June, 1 924.] . 
Seba typica (Chilton). 
Seba typica Chilton, 1906, p. 572; 1921, p. 56. 8. saundersü 
Stebbing, 1906, p. 163 (part). 
Specimens which I have referred to this species were taken by the 
F.LS. “ Endeavour” off the east coast of Flinders Island, Bass Strait. 
The largest of these were about 4-5 mm. long, and were apparently fully 
developed males. In them the palm of the second gnathopod was dis- 
tinctly oblique, and the basal and meral joints of the. fifth журн» widely 
expanded posteriorly. Smaller specimens have the palm transverse and 
the meral joint only slightly expanded. Although there was во female 
bearing eggs in the collection, there were specimens in which the first 
gnathopod was distinctly chelate, the palm being on a proje sea portion 
of the propod against which the finger i impinges ; these І considered to be 
females, or very young males not yet differing in structure from females. 
Other specimens showed transitional forms between the chelate limb and 
the ше xm with oblique palm ; some of them had the palm 
It is very pu E that all the fotus ‘of Seba described under different 
names really belong to one species. Walker, зо» describes the males 
latter, if p pm ture, diflers from the Australian specimens in stil tel 
the first gnathopod chelate. It is possible, however, that it is not fully 
developed, and has not yet attained the oblique palm of the male, though 
it has the joints of the peraeopod expanded. The largest male—i.e., the 
one of which Walker gives a full figure—was 7 mm. long, and therefore 
larger than specimens from Bass Strait having oblique palms; but the 
Antarctic specimens probably grow to a much larger size than those found 
farther north, and the specimen may not be mature though 7 mm. long. 
This supposition appears to be confirmed by the fact that the кона male 
examined by Walker is 5 mm. long, but has the peraeopod joints less 
expanded than in Australian specimens, which are slightly smaller. 
ous numbers of this series have appeared in Trans. N.Z. Inst. as follow : 
No. i - 59, р. 1; No. 2, vol. 53, p. 220; No. 3, vol. 54, p. 240. 
