AMPHIPODA. CHILTON. 59 



peraeopoda. In his figure of the whole animal Walker 

 (1907, pi. 13, fig. 22) shows the meral joints of the third, 

 fourth and fifth peraeopoda all equally expanded. In the 

 "Endeavour" specimens of S. typica it is only the fifth 

 peraeopod that has the very marked expansion and in 

 some specimens the joint is produced posteriorly more than 

 is shown in Walker's figures (see Fig'. 6 c) ; in the fourth 

 peraeopod (Fig-. 6 d) there is considerably less expansion, 

 and in the third still less, the meral joint showing- the same 

 amount of dilatation as in the female. 



In 8. artnata, as in S. typica, the male differs from the 

 female in the armature of the palm, the projections and 

 teeth being similar to those of the latter species, but the 

 propod is markedly produced so that the giiathopod is 

 distinctly chelate. Chevreux gives the size of the males 

 examined by him as scarcely 3 mm., and it is possible that 

 they were not fully mature, and that older specimens would 

 have the palm more transverse or even obliquely subchelate. 

 The male figured by Chevreux shows no expansion of the 

 meral joint of the last peraeopod: either it is not yet 

 developed or the species differs in this point from S. typica. 



As Walker lias already pointed out, the females of all the 

 species described are practically indistinguishable. 



Seba f ij pica" is known from Xew Zealand and from Bass 

 Strait between Australia and New Zealand. $. saundersii 

 Stebbing, with which 8. typica was at one time united, and 

 with Avhich it may ultimately prove to be identical, is known 

 from Cape Virgins, Patagonia, and, with some doubt, 

 from Algoa Bay, S. Africa. S. antarctica Walker is known 

 from South Victoria Land in the Antarctic : 8. armata 

 Chevreux from the Gulf of Gascony and the Azores. The 

 remaining species, S. innominata Bate was recorded from 

 the Gulf of Naples, but is still imperfectly known. 



LEUCOTHOE SPINICARPA, (Abildg.). 

 Leucothoe spinicarpa, Stebbing, 1906, p. 165. 

 Leucothoe spinicarpa, Chilton, 1912, p. 478. 

 Leucothoe spinicarpa, Barnard, 1916, p. 148 

 Leucothoe miersi, Stebbing, 1906, p. 165. 

 Leucothoe commensalis, Stebbing, 1910, p. 580. 



* Stebbing (1906, p. 163) gives S. typica and 8. armata as 'synonyms 

 of S. saundersii. In view of the facts mentioned by Walkeri'in his 

 description of S. antarctica, I have spoken of all these forms as separate 

 species pending further investigation. 



