572 " THETIS " SCIENTIFIC RESULTS. 



characters to be derived from the specific description, it has a 

 peculiarity in the male second antennse, the last joint of the 

 peduncle being dilated, and all the preceding joints being very 

 short. There remain for consideration the three species which 

 Haswell originally assigned to Lysianassa, under the specific 

 names nitens, affinis, and australiensis, subsequently transferring 

 them along with his L. kroyeri to the genns Anonyx. In 1882 

 Haswell spoke of L. nitens as allied to L. kroyeri, while in 1885 

 he distinguished L. australiensis from the latter species by the 

 non-piehensile character of the first gnathopods, without noticing 

 that those gnathopods are figured by Bate as non-prehensile in the 

 type specimen of L. kroyeri (White), a specimen an inch long, from 

 Tasmania. The specimens of Waldeckia ohesa described by 

 Chevreux and Walker attained a length of 17-18 mm., and the 

 possibility is open that they in fact belong to White's species. 

 Whether any or all of Haswell's apparently much smaller species 

 should be included in the genus Waldeckia, and whether the 

 species now to be described should receive one or other of those 

 specific names, are problems insoluble with the information at 

 present available. The differences are not really very consider- 

 able between the " Thetis " species and its much larger antarctic 

 companion. 



Second joint of third peraeopod attached 



to side-plate by a narrow neck 1. Waldeckia ohesa, Chevreux. 



Second jouit of third peraeopod broadly 



expanded proximally as well as 



distally 2. Waldeckia chevreuxi,sT^. nov, 



WALDECKIA CHEVKEUXI, sp.7wv. 



(Plate xlvii. b.) 



Station 87. 



Integument not especially hard. General shape agreeing with 

 W. ohesa, the fourth side-plate strongly produced under the fifth, 

 which is veiy large, but having the lower margin decidedly 

 indented, the sixth side-plate much narrower but very deep. 



Eyes large, dark, nearly meeting at the top of the head, of 

 which the lateral lobes are rounded. First antennae with stout 

 first joint, the two following very short, primary flagellum of 

 fifteen short joints, secondary of seven, second antennse with 

 penultimate joint of peduncle the longest, a little bent at the 

 base, flagellum of seventeen short joints. 



The mouth-organs as in W. ohesa, the palp of the mandibles 

 not shorter than the trunk, as in the figure given by Chevreux 

 contradicting his text. The first maxilla with two setse on inner 



