i 4 S DISCOVERY REPORTS 



length of 6th. Peraeopods 4 and 5, 2nd joint similar to that of peraeopod 3 but anterior 

 margin more convex and spinulose, and hind margin less convex, nearly straight in 

 peraeopod 5, with larger postero-inferior lobe, 4th similar but longer, other joints lost. 



Uropod 1, outer ramus subequal to peduncle, inner a little longer, both rami slender, 

 spinose, the inner slightly wider than outer, its upper margin minutely serrutale. 

 Uropod 2 not extending quite as far back as uropod 1, similar, but rami longer than 

 peduncle. Uropod 3, peduncle comparatively short and stout with two spines on upper 

 apex, a large and a small spine on lower apex, and three spines in middle of outer sur- 

 face, rami enormously expanded into two lamellae extending much beyond the other 

 uropods, set in a vertical plane, both obovate, with the distal margin crenulate, upper 

 margin of outer ramus with five spinules, that of inner ramus with three spines. This 

 description applies to the left uropod only; the right appears to have been injured like 

 the telson, and is composed only of a laminate, vertically set, plate, ovate, apically 

 feebly serrulate and with a spinule, apparently representing the peduncle. 



Branchial lamellae large, simple. Oostegites narrow. 



Remarks. As just stated the right uropod 3, as well as the telson, appear to have 

 suffered injury during the life of the animal, and to be in process of regeneration. It is 

 quite impossible to say what the normal shape of the telson is. Such as it is, it is here 

 figured; it was articulated in the centre of the distal margin of the 5th segment. 



Family TIRONIDAE 



Stebbing, 1906, p. 273. 

 Chevreux, 19 13, p. 133. 

 Barnard, 1925, p. 353. 



To this family is to be added a new genus created for the reception of a very curious 

 pelagic Amphipod taken off the coast of Portuguese West Africa. 



Genus Tiron, Liljeb. 



Stebbing, 1906, pp. 275, 727; 1908 (Ann. S. Afr. Mus., vi), p. 79. 

 Walker, 1904, p. 263. 



Tiron antarcticus, n.sp. (Fig. 86). 



Occurrence: 1. St. 175. South Shetlands. 1 immat. $ 6-5 mm. 

 2. St. WS 33. South Georgia. 1 $ 7"5 mm - Type. 



Description. Integument very minutely scabrous with little scale-like setules, best 

 seen on the dorsal profile under a high magnification. 

 Head carinate. Upper eyes faintly traceable, closely 

 adjacent to top of head, lower eyes not traceable. 

 Anterior peraeon segments feebly carinate ; segments 

 6 and 7 distinctly carinate. Hind margin of posterior 



lobes of side-plates 5 and 6 crenulate, each notch p; g ^ firon antarcticus, n.sp. 



with a setule. Pleon segments 1-5 carinate, the Peraeopod 5. 



