58 



ENDEAVOUR SCIENTIFIC RESULTS. 



female ; I haA^e one small specimen that I presume is a young 

 male which has the first gnathopod almost the same as in the 

 female, but with the palm more nearly transverse and 

 slightly irregular. Among the "Endeavour" specimens 

 there is no female bearing eggs, but there is one specimen 

 which has the first gnathopod similar to that described by 

 Stebbing for 8. saundersii or to the female of 8. armata as 

 described and figured by Chevreux. It has the first gnath- 

 opod distinctly chelate and the distal portion bent inwards 

 in a different plane from that of the basal half, so that it 

 is difficult to get the whole gnathopod in view at one time. 



Individuals with the first gnathopoda having this same 

 chelate form were found by Walker in S. antarctica bearing 

 eggs, and we may therefore presume that this "Endeavour" 



c d 



Fig. 6 c d. Subn tijpica, (Jhilton, male. 

 c. Fifth peraeopod. d. Fourth peraeopocl. 



specimen is also a female. In 8. antarctica Walker speaks 

 of dimorphic males, but as the two forms he describes differ 

 only in the amount of expansion of the meral joints of the 

 posterior peraeopoda they are probably rather to be con- 

 sidered as different stages of development. In 8. antarctica, 

 therefore, the males appear to differ from the females only 

 in the great expansion of the meral joints of the posterior 



