AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 209 



the much longer and more slender antennae and in the greater depth of the cleft in the 

 telson ; the eye is rather small, oval, or very slight reniform. These specimens are 

 therefore somewhat different from the specimens from Kerguelen Island described by 

 STUBBING in the Challenger Eeports. I think, however, that CHEVREUX is right in 

 considering the two specimens examined by him as male and female of the same 

 species, for, in addition to the female specimens of which I have spoken above, I have 

 one specimen from Station 325 which by the character of the antennae is almost 

 certainly a male, and it agrees very closely with the form described by CHEVREUX as 

 the male. It has the teeth at the end of the antennal joints a little longer than is 

 shown in his figures, but they are arranged in the same way, and the difference in 

 degree is probably due to age. This specimen, like his, has the eyes large, oval, and, 

 in the spirit specimen, of a reddish-brown colour. I have carefully compared it with 

 the full description given by STEBBING of the Challenger specimens, and it agrees 

 minutely in everything except that the telson is less deeply cut. My specimen is, 

 however, about 12 mm. long, while his is only 7'5 and was probably immature. This 

 seems to be confirmed by the fact that the antennae in it are not modified in the special 

 way described by CHEVREUX. In the young male we would naturally expect to find 

 the telson more like that of the female. WALKER also has stated that the cleft in the 

 telson becomes shallower in older forms. 



From the resemblance of my specimens to those described by CHEVREUX, and of 

 the male to STEBBING'S, I cannot help coming to the conclusion that E. laticarpus 

 must be specifically identical with E. antarcticus. 



To this species must, I think, be added the forms referred by WALKER to 

 E. propinquus. I have been fortunately able to examine two specimens obtained by 

 the Nimrod in the same locality as WALKER'S specimens, and I cannot find sufficient 

 differences to separate them from the Scotia specimens. They are 7 '5 mm. long, and 

 appear to be males, having the antennae short and provided with calceoli ; the eyes are 

 nearly round, of moderate size, and the telson has the cleft deeper nearly as deep as 

 in the form figured by CHEVREUX as the female. The other characters agree very closely, 

 and the points of difference noted are probably due to age. The back of the pleon and 

 of the posterior portion of the peraeon is somewhat scabrous. 



STEBBING has given the apparent absence of calceoli as one of the characters of 

 E. antarcticus, but I expect they will, as in so many other species, be found to be 

 normally present in fully mature males. They are certainly present in my Nimrod 

 specimens, though, as stated above, these specimens may be more or less immature ; the 

 calceoli are, however, extremely delicate, and appear much more elongated than is 

 usually the case, and a character that is much more easily observed is the downward 

 projection of every second joint of the flagellum as described and figured by CHKVREUX. 

 The male specimen from Station 325 is not in a sufficiently good state of preservation 

 (having apparently been partially dried) to show the calceoli, but the antennae show the 

 other modifications of the male. WALKER makes no mention of calceoli in his speci- 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 491.) 



