214 PROFESSOR CHARLES CHILTON ON THE 



Mr STEERING has put Atylus lippus Haswell down as a doubtful species of 

 Eusiroides, but I have specimens from Sydney Harbour that I think certainly belong 

 to HASWELL'S species, and these I cannot distinguish from the species common on New 

 Zealand coasts which was described as Atylus danai by Mr THOMSON. The species is 

 therefore now known from Australia, New Zealand, and the Falkland Islands, and 

 probably extends round the globe in sub- Antarctic seas. 



Pontogeneia antarctica Chevreux. 



Poutoijeneia antarctica Chevreux, 1906A, p. 72, fig. 2, and 1906B, p. 69, figs. 40 and 41. 

 Chilton, 1909A, p. 624. 



South Orkneys, Scotia Bay, Station 325 ; in shore pools and at moderate depths. 

 Several specimens, the largest 6 mm. long. 



These specimens agree well with CHEVREUX'S description, and can be distinguished 

 from the preceding most easily by the character of the upper antennae, as described 

 above. 



Though this species seems to be a true Pontogeneia, yet in the somewhat slender 

 antennae it makes some approach towards the genus Paramcera, and at the end of the 

 third joint of the upper antenna there is a short process tipped with one or two long hairs 

 that appears to represent a vestigial accessory flagellum, but it is fused with the third 

 joint of the peduncle somewhat as appears to be the case in Atylus megalophthalmus 

 Haswell, which is looked upon as a variety of Paramcera austrina (Bate). Ponto- 

 geneia antarctica is, however, clearly distinguished from Paramcera by having every 

 third joint of the primary flagellum expanded below, instead of every second, and 

 also by the lobes of the telson being rounded posteriorly. 



The species is known from Auckland and Campbell Islands, from Flanders Bay and 

 Booth Wandel Islands, as well as from the South Orkneys, and thus appears to represent 

 P. danai in colder and more southerly seas. 



Genus ATYLOIDES Stebbing, 1888. 



Atyloides magellanica (Stebbing). (Plate I. fig. 18.) 



Atylopsis magellanica Stebbing, 1888, p. 925, pi. Ixxix. 

 Pontogeneia magellanica Stebbing, 1906, p. 360. 



Walker, 1907, p. 33, pi. xii. fig. 20. 

 Chevreux, 1906s, p. 64, figs. 37-39. 



Atyloides magellanica Chilton, 1909A, p. 627. 



South Orkneys, Scotia Bay, Station 325 ; shore pools. 2nd February 1904. 



Temperature 32-35. Numerous specimens, the largest about 10 mm. long. 



These agree well with the description of this species given by CHEVREUX. It is 



evident that the telson varies to some extent. CHEVREUX figures it with a seta arising 



from a slight notch on each half. WALKER says " the divisions of the telson are smooth 



and rounded at the tips," and shows it with the sides converging and convex, without 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 496.) 



