94 DISCOVERY REPORTS 



Remarks. The resemblance of this species to the Challenger species lachneessa from 

 Kerguelen are no less remarkable than the differences between them. 



Here the rostrum is not deflexed, the 2nd side-plate not narrow, the 4th and 5th 

 joints of peraeopod 4 not broadly expanded, the 2nd joint of peraeopod 5 not produced 

 downwards, and the postero-inferior angle of pleon segment 3 has a strong acute point. 

 The original description of lachneessa (1888, p. 825, pi. lvii) says in regard to the last- 

 mentioned feature "a slightly outdrawn rounded point, with a deep re-entering angle 

 above it". In the 1906 diagnosis this becomes simply "rounded". This one feature 

 would seem enough to separate the two species. 



Stebbing ( 1 888 , p . 829) also says that in a second specimen the joints of the peraeopods 

 were not so broadly expanded as in the ? figured. Even so, one can scarcely reconcile 

 the 4th and 5th peraeopods of the present form with those of lachneessa. 



Side-plates 2 and 3 are quite different in shape in the two species, though one might 

 assume that Stebbing's figure of side-plate 2 was drawn from an imperfectly flattened 

 preparation if he had not expressly described it as narrow. (It may be noted that the 

 expansion of side-plate 1 seems to have been reversed relatively to the limb in the 

 Challenger figure.) 



This animal looks very like an Oniscid wood-louse. 



Phoxocephalopsis, Schell. 



Schellenberg, 1931, p. 69. 

 Barnard, 193 1, p. 426 (Haustoriella). 



Head with short rostrum and obsolete post-antennal angles. Eyes small, feeble. Side- 

 plates 1-4 successively deeper, 4 broadly ovate, scarcely emarginate behind. Pleon seg- 

 ments 2-4 with pleura produced backwards, especially segment 2. Telson broader than 

 long, cleft to base. 



Upper lip projecting beyond epistome. First antenna with first two joints expanded. 

 Second antenna with 4th joint strongly expanded, 5th less so. Mandible with three 

 spines on spine row, and palp strong. Lower lip with broad inner lobes, outer lobes with 

 short but distinct mandibular processes. Maxilla 1, inner lobe ovate, with a single 

 strong seta on middle of inner margin, palp 2-jointed, 1st joint longer than 2nd, which 

 bears three strong plumose setae on apex. Maxilla 2, lobes broadly oval, inner with 

 oblique row of plumose setae as well as the marginal row. Maxilliped, inner plate 

 truncate, outer ovate, 2nd joint of palp strongly expanded internally, 3rd angularly 

 expanded externally, 4th slender. 



Gnathopod 1 as in Urothoe, but 6th joint weaker and dactyl short and curved. 

 Gnathopod 2 more slender than gnathopod 1, 5th joint fusiform. 



Peraeopods 1 and 2, 2nd and 4th joints stout, 5th very short, dactyls slender. Peraeo- 

 pod 3, 3rd~5th joints very broad, with transverse rows of spines as in Hatistorius. 

 Peraeopods 4 and 5, 4th and 5th joints moderately expanded. 



Uropod 1, rami acuminate. Uropod 2, rami subacute, spinose. Uropod 3, peduncle 

 broad, spinose, rami foliaceous with spines and long plumose setae. 



