GAMMARIDEAN AMPHIPODA 175 



of 15 to 135 m. carmel: Macrocystis holdfast, rare, doubtful iden- 

 tification. 



Distribution. — 3 kinds: (1) Carmel and Goleta, Macrocystis hold- 

 fasts, 0-3 m.; (2) southern Calif ornian coastal shelf, 15-135 m.; (3) 

 typical forms described by Hurley, 256-1720 m., northeastern Pacific 

 Ocean from southern California (33° N) to British Columbia (50° N). 



"Lysianassa" Milne Edwards, provisional synonymy 



Figure 47 



''Lysianassa" Milne Edwards: Stebbing, 1906, p. 37 (with synonymy). 



ISocarnella Walker, 1904, p. 239. 



Lysianopsis Holmes, 1905, p. 475. — Hurley, 1963, pp. 67-73 (with synonymy). 



Aruga Holmes, 1908, pp. 504-505. 



Arugella Pirlot, 1936, pp. 259-260. 



Shoemakerella Pirlot, 1936, pp. 264-265. 



Pronannonyx Schellenberg, 1953, pp. 107-108. 



Group diagnosis, conservative features. — Accessory flagellum 

 more than 2-articulate, articles 2-3 of first antennal peduncle rather 

 elongate for the family; mouthpart bundle quadrate in outline from 

 lateral view, not conical; upper lip and occasionally epistomal area 

 lamellar and projecting anteriorly from buccal bundle, upper lip 

 and epistome separated by definite incision, slit or sinus; mandible 

 with distinct, untoothed cutting edge except for one blunt lateral 

 process, molar small, conical, not triturative, setulose, occasionally 

 absent; mandibular palp 3-articulate, attached proximal to molar 

 position; lower lip lacking inner lobes; maxilla 1 bearing 2 or fewer 

 setae on medial lobe, setae never falcate, palp with 2 articles; maxil- 

 lipedal lobes normal for the family, palp 4-articulate; gnathopod 1 

 simple; coxa 1 subequal to coxa 2, never covered by coxa 2, coxa 3 

 not much larger than coxa 2, anterior coxae otherwise normal for 

 the family; pereopods simple; uropods all developed, biramous, rami 

 of first 2 pairs subequal; telson entire or slightly emarginate; gills 

 apparently simple, unplaited. 



Variable characters. — Epistome either produced forward as a 

 lamellar plate similar to upper lip or not, upper lip often slightly 

 stunted in species having produced epistome; mandibular molar 

 present or absent; mandibular palp article 1 elongated or not; setae 

 of inner lobe of maxilla 1 varying from to 2 in number; spines of 

 outer plate of maxilla 1 in two groups, outer and inner groups of 

 similar types or distinct types; plates of maxilla 2 highly variable in 

 size and shape; maxillipedal palp variable in shape and length of 



Figure 45. — Lepidepecreum tgurjanovae Hurley, female, 4.0 mm., station 41: a, coxa 4; 

 b, c, gnathopod 1; d, gnathopod 2; e,f, g, h, pereopods 1, 3, 4, 5. Male, 5.2 mm., "Velero" 

 station 5880: i, gnathopod 1. 



