NO. 1 BARNARD: AMPHIPODA OF THE FAMILY AMPELISCIDAE 21 



Peraeopod 4: posterior edge of article 5 with 2 sets of spines, poste- 

 rior edge of article 6 with 3 spines. 



Peraeopod 5 rather slender, posterior lobe of article 2 rather narrow ; 

 lower hind edge very oblique, lobe reaching downward to middle of 

 article 4; article 4 slightly longer than 3, with a narrow, posterior, setose 

 lobe ; article 5 shorter than 6, anterior edge with 1 or 2 notches ; article 

 6 moderately stout ; article 7 shorter than 5, slender. 



Uropod 1 reaching to end of uropod 2, rami almost as long as pedun- 

 cle; both edges of inner ramus spinulose, outer ramus unarmed. 



Uropod 2: outer ramus shorter than inner, the inner ramus as long 

 as peduncle; inner edges of both rami spinulose, outer edge of inner 

 ramus with several small spinules. 



Uropod 3 : outer ramus slender, lanceolate ; inner ramus broad, lance- 

 olate; both rami strongly setose. 



Telson: lobes rather inflated, apices blunt, notched, each with a 

 small blunt spine and a setule; upper surface of each lobe with 2 or 3 

 small, blunt spines. 



Pleon segment 3 : posterior edge convex, lower posterior corner 

 rounded, subquadrate. 



Pleon segment 4 raised dorsally into a massive, nearly acute process, 

 the posterior edge of which is vertical. 



Pleon segment 6: lateral ridges well developed. 



Female: Unknown. 



Types: Holotype, AHF No. 418, male, 10 mm; paratype, male, 

 10 mm. 



Type locality: Station 1388-41, 3.6 miles off east point, Santa Rosa 

 Island, California, 52 to 55 fms. 



Material examined: Stations 939-39 (1 male), 1388-41 (2 males). 



Remarks: This species resembles Ampelisca birulai Briiggen (1909), 

 but differs in the shape of the rami of uropod 3, the armature and shape 

 of the telson, and the shape of articles 3 and 4 of peraeopod 5. 



Distribution: The type locality and a single record from Port 

 Parker, Costa Rica, 5 to 10 fms. 



Ampelisca cucullata, new species 

 Plate 13 



Description of female: Head longer than first 2 body segments, an- 

 terior edge slightly incised, lower front edge oblique, convex. Upper 

 pair of eyes behind upper margin of antenna 1, lower pair at lateral angle 

 of head. 



