130 PERCY SLADEN TRUST EXPEDITION 



I append a brief description of my specimens and give a figure of the copulatory 

 apparatus on the first pleopods of the male. 



Carapace without lateral denticles and gastro-hepatic groove ; produced in front as 

 a triangular plate with the terminal angle slightly less than 90°, the apex pointed and 

 very slightly upturned, reaching about half-way up the basal joint of the antennular 

 peduncle and not as far forward as the eyes ; the anterior third of the carapace is adorned 

 in the mid-dorsal line by a low keel which does not reach the apex of the rostral plate 

 and in front of which is a median depression which latter is produced laterally for a little 

 way on each side of the keel. 



Antennular peduncle with a rather long slender spine on the outer corner of the 

 basal joint ; the lobe from the inner corner of the basal joint is in the shape of a quad- 

 rangle with the outer distal corner produced slightly outward and forward, the anterior 

 margin being straight or lightly concave, and deeply serrate or pectinate, with about 

 twelve or thirteen spiniform teeth; the lobe proceeds from the usual raised hispid cushion, 

 extends for rather more than half-way up the second joint of the antennular peduncle and 

 is less than half the width of the basal joint at its base but considerably more than half 

 the width of the second joint at its distal margin ; the lobe from the inner corner of the 

 second joint of the antennular peduncle is rather large, sub-quadrangvxlar in shape, 

 without spine or process. 



The antennal scale reaches about half-way up the third joint of the antennular 

 peduncle ; the basal ventral spine is about one-third of the length of the scale, long, 

 slender and smooth. 



The telson has two pairs of dorsal denticles and the inner uropod reaches to the apex 

 of the telson, the outer uropod being somewhat longer. 



The figure (fig. 7) will best explain the structure of the copulatory apparatus on the 

 first pleopod of the male. The nomenclature of the parts is that suggested by Hansen. 

 A spine-shaped process, p', is present. The terminal process, j)\ is somewhat stout, 

 reaching to the base of p*, and widening distally into more or less spatulate form. The 

 proximal process, p\ is about as long as p", sickle shaped, sharply pointed at the tip and 

 having a stout tooth or heel on the inner side of the first curve. 



Genus EuPHAUSiA, Dana. 

 20. Eiiphausia mutica, Hansen. 



E. pellucida (pars), G. O. Sars, 1885. 



E. mutica, Hansen, 1905. 



E. mutica, Tattersall, 1906. 



E. mutica, Hansen, 1910. 

 Stations. C, 1200 — fms., two; D, surface, four; F, surface, three; H, surface, 

 two ; L, 75 fms., two ; N, 600—0 fms., sixteen ; U, 1 80 — fms., one ; P, 20 fms., twenty- 

 one ; Q, surface, thirteen; c, 225 fms., four, 250 fms., seven, 275 fms., sixteen, 300 fms., 

 fifteen; d, surface, two; e, 300 fms., four; k, 100 fms., one; n, surface, one; o, surface, 

 one; q, 1000 — Ofms., seven; r, 500 — 250 fms., one; s, 250 — fms., six, 750 — Ofms., one; 



