NO. 1 BARNARD : AMPH1PODA OF THE FAMILY AMPELISCIDAE 27 



Peraeopod 2 similar to 1 but with generic differences. 



Peraeopod 3 : posterior margin of article 6 with 6 or 7 strong setal 

 spines. 



Peraeopod 4: posterior margin of article 5 with 4 sets of spines, 

 posterior margin of article 6 with 4 spines. 



Peraeopod 5 : inferior edge of posterior lobe of article 2 nearly 

 truncate below, extending down to junction between articles 4 and 5 ; 

 article 2 rather short ; article 4 longer than 3 ; articles 5 and 7 of equal 

 length, about two thirds as long as article 6. 



Uropod 1 reaching to end of uropod 2; rami equal in size, as long 

 as peduncle ; both margins of inner ramus and outer margin of outer 

 ramus lined with spinules. 



Uropod 2: rami shorter than peduncle, equal in size; inner margins 

 of both rami spinulate ; apex of outer ramus with a long spine. 



Uropod 3 : rami equal in length, broad, lanceolate. 



Telson : apices pointed, notched laterally, each notch with 3 or 4 

 spinules and 1 setule ; dorsal surface of each lobe with 2 to 4 spinules. 



Pleon segment 3 : posterior edge strongly convex, lower posterior 

 angle strongly produced into a tooth; dorsal surface of segment with 2 

 low, lateral, longitudinal crests. 



Pleon segment 4 with a strong dorsal laminar crest, the posterior 

 dorsal edge of which inclines upwards, rounds off, and then descends 

 obliquely to base. In the largest female in the collections (18 mm long), 

 the front portion of pleon segment 4 has 2 low, lateral ridges. 



Pleon segment 6: lateral ridges sharp, prominent. 



Male: Unknown. 



Material examined: Stations 470-35 (1), 538-36 (1), 701-37 (1), 

 722-37 (1), 887-38 (6), 889-38 (6), 898-38 (1), 913-39 (1), 975-39 

 (1), 1074-40 (1), 1122-40 (1), 1123-40 (2), 1153-40 (2), 1205-40 

 (1), 1219-40 (1), 1232-41 (1), 1274-41 (4), 1278-41 (1), 1295-41 

 (3), 1321-41 (2), 1340-41 (1), 1348-41 (1), 1372-41 (1), 1678-49 

 (1), 1905-49 (2), 2030-51 (4). Hubbs Station No. 49-166 (1 speci- 

 men). 



Remarks: The lower edge of the posterior lobe of article 2 of perae- 

 opod 5 is transverse in young specimens (7 mm) ; in older specimens it 

 is asymmetrically rounded. 



As is seen in Holmes' figures of this species and the figures in this 

 paper, the dorsal crest of pleon segment 4 is rather variable in shape. 



Some specimens reaching a size of 12-13 mm may lack brood plates, 

 yet not possess the setal tufts typical of the male antennae of this genus. 

 However, the peduncles of the antennae are somewhat stouter and the 



