NO. 5 BARNARD: AMPHIPODA 77 



bathyal forms as widely separated as the north Atlantic and the Tas- 

 man Sea. 



Monoculodes norvegicus (Boeck) 



Monoculodes norvegicus (Boeck), — Sars 1895: 301-302, pi. 107, fig. 1 ; 

 Stebbing 1906: 265-266; Shoemaker 1930: 67; Stephensen 1931a: 

 247; Stephensen 1938: 228-229; Stephensen 1940: 39; Gurjanova 

 1951 : 582-583, fig. 389; J. L. Barnard 1962e: 367. 

 Canyon material: 7044 ( 1 ) , 7728 ( 1 ) . 

 Basin material: 2439 ( 1 ) . 



Monoculodes perditus, new species 



(Fig. 30) 



Diagnosis: Rostrum medium in length, slightly deflexed, reaching 

 end of article 1 of antenna 1, tapering acutely; lateral cephalic lobes 

 short, obtuse; eye(s) very pale; largely located on rostrum, anterior 

 edge of eyes about one third back on rostrum; dactyls of pereopods 1 

 and 2 as long as sixth articles ; coxa 4 with straight, unproduced pos- 

 terior margin ; gnathopods stout, palm of gnathopod 1 longer than pos- 

 terior margin of article 6, article 5 with stout, medium-sized lobe; ar- 

 ticle 6 of gnathopod 2 intermediate between slender and stout, palm 

 and posterior margin of article 6 subequal, article 5 with posterior lobe 

 of medium length and slenderness, reaching to defining corner of palm 

 and facing posterior edge of article 6 ; all pleonal epimera rounded at 

 corner; telson slightly emarginate distally. 



Notes: Head of larger male damaged and restored as accurately as 

 possible in the drawing; head of holotype undamaged as drawn; only 

 one fifth pereopod is present and it probably has abnormally stunted ar- 

 ticles 5-7. 



Holotype: AHF No. 6014, male, 2.9 mm. 



Type locality: Station 6845, Coronado Canyon, California, 32°-30'- 

 16"N, 117°-16'-50nV, 177 m, February 1, 1960. 



Alaterial: 2 specimens from the type locality. 



Relationship: This species differs from M. coecus Gurjanova (see 

 1951) in the much stouter articles 5 and 6 of gnathopod 2. From M. 

 diamesus Gurjanova (see 1951), M. perditus differs in the non-acute, 

 obtuse, lateral cephalic lobe, the larger lobe of article 5 of gnathopod 1, 

 the shorter posterior margin of article 6 of gnathopod 1, and the longer 

 posterior lobe of article 5 on gnathopod 2. From M. rninutus Gurjanova 

 it differs in the emarginate telson and shorter posterior lobe of article 

 5 on gnathopod 1. M. perditus bears resemblance to M. latimanus 

 (Goes) (see Sars 1895: pi. 108) but differs in the much longer dac- 

 tyls of pereopods 1 and 2 and the emarginate telson. 



