188 PROFESSOR CHARLES CHILTON ON THE 



Tmetonyx stebbingi is now known from South Victoria Land and from Coats Land, 

 and I have recorded a form from the sub- Antarctic islands of New Zealand which 

 appears to belong to this species, but is much smaller, has well-developed eyes, and is 

 darkly pigmented (1909A, p. 618). 



Genus ORCHOMENELLA. 



Orchomenella pinguides Walker. 



Orchomenella pinguides Walker 1903A, p. 46, pi. viii. figs. 24-30. 



1907, p. 13. 



South Orkneys, Scotia Bay, Station 325. 2nd January 1904. Several specimens. 



These specimens undoubtedly belong to this species, as on comparison I find that 

 they agree closely with co-types of WALKER'S species kindly sent me by Dr CALMAN of 

 the British Museum. They show also a pretty close resemblance to Cheirimedon 

 dentimanus Chevreux, but differ in having the eyes not black (in spirit specimens), 

 and in having the first gnathopod less strongly developed and the palm not concave ; 

 the third segment of the pleon has the posterior angle rather more rounded, and the 

 telson appears slightly more elongated than in CHEVREUX'S species. I have also been 

 able to examine specimens of 0. pinguides from South Victoria Land collected by the 

 Nimrod in 1908, and can detect no difference between them and the South Orkneys 

 specimens. In most of the Nimrod specimens the eye is colourless in spirit and 

 appears to have been red in the living animal ; some of the specimens were labelled 

 " Red Amphipods," and the specimens preserved in formalin still show the red colour 

 of the eyes and a slight pinkish tinge of the whole body. On the other hand, WALKER 

 in describing his species says : " Eyes moderately large, dark, oval, expanded below." 

 There thus appears to be some variation in the eyes of Orchomenella pinguides, for in 

 the co-types from the British Museum one specimen has an eye still fairly darkly 

 coloured, but in the others it is pale, as in the South Orkneys specimens, and 1 have 

 noticed also some variation in the Nimrod specimens. 



Orchomenella macronyx Chevreux. 



Orchomenella macronyx Chevreux 1905, p. 161, fig. 2. 



1906B, p. 8, figs. 5-7. 



South Orkneys, Scotia Bay, Station 325. May 1903. Two specimens, 4 P 5 mm. 

 long. 



These two small specimens on the whole agree well with CHEVKEUX'S description, 

 especially in the shape of the last segment of the pleon and the first of the urus. 

 The eye is rather narrower and less oval, and the first gnathopod appears to have a 

 slightly more transverse palm, against which the finger fits closely without projecting 

 beyond it. The telson is concave above. 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 470.) 



