572 Prof. C. Cliilton on a 



considerably from the New Zealand specimens, lie has written 

 to me suggesting that after all these latter should be considered 

 a distinct species. At the same time Mr. Walker has very 

 kindly sent me three female specimens of S. Saundersi'i, 

 Stebbing, so that I have been able to compare them with 

 mine ; and after doing so I am forced to agree with him that 

 the New Zealand specimens, though very closely allied, must 

 be considered distinct under the name S. fi/p>'ca (Chilton). 

 Unfortunately the only female specimen I had is no longer 

 extant, so that the following description is drawn up from 

 the male only; this, however, is perhaps not of much conse- 

 quence, since it is evident that in this genus, as in so many 

 others of the Amphipoda, the males of the different species 

 differ from one another much more than the females do. 



Seha typica (Cliilton). 



1884. Teraticiim typicum, Cliilton, Trans. X. Z. lust. xvi. p. 257, 

 pi. xviii. figs. 1 a~\f. 



1885. Seha typica, Chilton, N. Z. Journal of Science, ii. p. 320. 



1886. Seha typica, Thomson and Chilton, Trans. N. Z. Inst, xviii. p. 148. 

 1888. Seha Saundersii, Stebbing, Report on the 'Challenger' Am- 

 phipoda, p. 783, pi. xlix. (in part.). 



1891. Seba Saundersii, Chilton, Trans. N. Z. Inst. xxiv. p. 260. 



Male. — Closely allied to S. Saundersii, Stebbing, and also 

 to 8. armata, Clievreux, and apparently differing mainly in 

 the first gnathopoda, which are large and strong ; propod 

 oblong, width at base equalling tliat of tlie end of the carpus, 

 anterior border with an oblique row of setse about the middle ; 

 ])aim transverse, its middle third with a rather deej) depres- 

 sion, in which rises a small projection bearing a single short 

 seta, the portions of the palm on either side of the central 

 depression bearing three or four short sette ; dactyl stout, its 

 inner border very minutely serrate. 



Female. — Differs from the male in having the first gnatliopod 

 chelate and apparently very similar to that of Seha Saundersii. 



Hah. Lyttelton. 



Length about 2 mm. 



]\I. Clievreux gives several small points in which S. ar- 

 mata appears to differ from S. Saundersii, such as the shape 

 of the side-plate of the first segment of pereion, the relative 

 lengths of the different joints of the antennae, and of the 

 peduncles and rami of tiie uropoda &c. After carefully 

 comparing the figures and descriptions given by M. Clievreux 

 and Mr. Stebbing with regard to these points, and after 

 observing them in my specimens and in those of S. Saundersii 

 sent by Mr. Walker, I must confess that 1 have little con- 



