NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 19 



setose lobe; article 5, distal anterior edge notched; article 6 longer than 

 5, expanded ; article 7 shorter than 5. 



Uropod 1 nearly reaching the end of uropod 2, rami subequal to each 

 other, equal in length to peduncle, both margins of inner ramus spinu- 

 late, outer ramus unarmed. 



Uropod 2 : outer ramus slightly shorter and more slender than inner, 

 both margins of inner ramus and outer margin of outer ramus spinulate. 



Uropod 3 : rami moderately slender, outer ramus slightly shorter 

 and narrower than inner, its end notched ; apex of inner ramus slightly 

 uncinate, inner apical margin setose. 



Telson: lobes rather broad, apices blunt, each with a spinule and a 

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



Pleon segment 3 : posterior edge convex, lower posterior corner 

 quadrate in outline. 



Pleon segment 4: posterior dorsal surface raised into a weakly 

 saddle-shaped process, the posterior dorsal edge keel-like. 



Pleon segment 6: lateral ridges weakly developed. 



Male: Only 2 underdeveloped males from Station 1390-41 were 

 found in the collections. They differ from the female only in the pres- 

 ence of slightly developed setal tufts on the peduncles of both antennae. 



Types: Holotype, AHF no. 414, female, 11 mm; paratypes, 4 fe- 

 males. 



Type locality: Station 1294-41, one half mile south of Gull Island, 

 Santa Cruz Island, California, 34 to 41 fms. 



Material examined: Stations 209-34 (5), 277-34 (11), 457-35 

 (1), 478-35 (18), 481-35 (8), 555-36 (1), 556-36 (1), 561-36 (2), 

 564-36 (16), 576-36 (1), 581-36 (1), 582-36 (1), 702-37 (2), 704-37 

 (1), 706-37 (1), 745-37 (1), 908-39 (1), 911-39 (1), 981-39 (1), 

 985-39 (1), 1150-40 (4), 1173-40 (1), 1192-40 (2), 1194-40 (2), 

 1202-40 (48), 1220-40 (2), 1229-41 (2), 1267-41 (1), 1280-41 (1), 

 1294-41 (10), 1298-41 (5), 1318-41 (1), 1321-41 (3), 1353-41 (1), 

 1359-41 (7), 1373-41 (1), 1386-41 (3), 1387-41 (1), 1388-41 (21), 

 1390-41 (17), 1411-41 (1), 1412-41 (2), 1418-41 (16). 



Remarks: The paratype selected for figuring (10 mm) did not show 

 as well developed characters of the third uropods as did other specimens, 

 one of which, from Station 1220-40, is also figured. The shape of uropod 

 3 and the heavily developed second article of the first 4 appendages make 

 this species striking. 



It is related to Ampelisca fusca Stebbing (1888), but differs in the 

 short antenna 1, the shape of the third uropods and telson, and the lack 

 of teeth on the first three coxae. 



