152 DISCOVERY REPORTS 



plate 4 often not so sharply acute below. Telson cleft for a little more than one-third 

 of its length, apices acute, not notched; it is thick, and around the lateral margin and 

 on either side of the cleft is bevelled on the under surface. 



Antenna i as in serrata Sars, ist joint scarcely enlarged basally, flagellum in $ 8- 

 jointed, ist joint elongate, strongly setose, accessory flagellum elongate. Antenna 2 

 elongate in adult <J, extending to end of pleon segment i, upper margin of peduncle 

 setose. Epistome and upper lip not projecting below lateral angles of head. 



Peraeopods 3-5, 2nd joints usually with simple marginal teeth. 



Uropod 3, inner margins of both rami with long plumose setae in $. 



The above slight differences in these specimens as compared with the Terra Nova ? 

 may be ascribed to local variation, and perhaps to the effect of the preservative on the 

 latter. The Terra Nova specimen was soft, and consequently the foveolate sculpturing, 

 if present, was not detected. The S is usually more strongly nodulose and carinate than 

 the?. 



Distribution. McMurdo Sound, 205 m. 



Genus Liouvillea, Chevr. 

 Chevreux, 19 13, p. 138. 



Liouvillea oculata, Chevr. 



Chevreux, 1913, p. 139, figs. 34-36. 



Occurrence: 1. St. 164. South Orkneys. 3 S3 n mm., 2 ?$ 13 mm. 

 2. St. 175. South Shetlands. 2 $°. 15-16 mm. 



Remarks. Considerably larger than Chevreux's specimens, one of which was an 

 ovigerous $ 9 mm. in length. 



The dorsal tooth on peraeon segment 7 is nearly obsolete in no. 1 and quite obsolete 

 in no. 2 ; and in the latter the tooth on pleon segment 1 is also obsolete. All the speci- 

 mens, especially the largest two (no. 2), show a dorso-lateral longitudinal groove on 

 peraeon segment 7 and pleon segments 1-3 ; and the dorsum of pleon segment 3 is very 

 shallowly indented on either side of a low medio-dorsal ridge. 



Note 130 for St. 175 gives the colour as follows: " Thorax and abdomen mainly dark 

 liver colour, due to close speckling of minute chromatophores. Thorax anteriorly with 

 a large patch of pale greenish yellow on either side, involving coxal plates of segments 

 3-5 and joining dorsally on 4th segment. Posterior thoracic legs with reddish bands. 

 Eyes dark brown". 



Distribution. Petermann Island, 3-60 m. 



Genus Cacao, Brnrd. 

 Barnard, 1931, p. 427. 



Rostrum minute. Eyes very large and prominent. Side-plate 1 large, as deep as side- 

 plate 2, triangularly produced forwards; side-plate 3 shallower than 2, 4 shallower than 

 any of the preceding; side-plates 5-7 feebly bilobed. Telson entire, apically emarginate. 



Antenna 1 without accessory flagellum. Upper lip bilobed. Mandible with smooth 



