REPORT ON THE AMPHIPODA. 759 



Fifth Peneopods. — Side-plates small. First joint more dilated than in the preceding 

 pair, with six or seven spinules on the front margin, the rounded lower margin behind 

 overlapping the second joint ; the rest of the limb as in the preceding pair. 



Pleopods. — Coupling-spines very short and small, with an apical pair of teeth and a 

 lateral pair ; a single cleft spine below the centre of the first joint of the inner ramus; 

 joints of the rami numbering from seven to nine. 



Uropods. — Peduncles of the first pair not quite so long as the rami ; the rami equal, 

 the inner with two, the outer with three marginal spines ; peduncles of the second pair 

 shorter than the inner ramus ; the outer ramus much shorter than the inner, each with 

 pectinate upper edge, and two marginal spines ; the peduncle of the third pair equal in 

 length to the basal portion of the ramus, which is considerably longer than the apical 

 portion or nail, and carries three marginal spines. 



Telson not quite reaching the end of the peduncle of the third uropods, twice as long 

 as broad, fiat at the base, the sides almost parallel to below the centre, armed each with 

 three spines, the lowest of which is the largest, then converging rapidly to an almost 

 acute apex. 



Length. — The specimen, in the position figured, measured, from the front of the head 

 to the back of the third pleon-segment, three-twentieths of an inch. 



Locality. — Station 313, ofi" Cape Virgins, Patagonia, January 20, 1876 ; lat. 

 .52° 20' S., long. 67° 39' W.; depth, 55 fathoms; bottom, sand; bottom temperature, 

 47°"8. One specimen ; female. Trawled. 



Remark. — The specific name alludes to the place of capture, the neighbourhood 

 of the Strait of Magellan seeming to be particularly prolific in small species of 

 Amphipoda. 



Metopa crenatipalmata, n. sp. (PI. XLII.). 



Rostrum and lateral angles of the head inconspicuous ; the first three segments of the 

 pleon with the points of the postero-lateral angles not produced ; the fourth segment with 

 a slight dorsal depression. 



Eyes round. 



Upper Antennse. — First joint thicker than the second but scarcely as long ; third 

 joint not half as long as the second ; the fiagellum of about twelve joints, the first as long 

 as the third joint of the peduncle ; apparently a rudimentary secondary fiagellum is 

 present. 



Loiver Antennse longer than the upper. First three joints very short, gland-cone 

 very small ; fourth joint rather thicker and a little shorter than the fifth ; the fiagellum 

 of eight joints longer than the fifth joint of the peduncle ; the first joint of the fiagellum 



