NO. 5 BARNARD : AMPHIPODA 91 



Family STENOTHOIDAE 

 Mesometopa neglecta roya, new subspecies 



(Fig. 41) 

 References to typical subspecies : 



[Metopa neglecta Hansen.— Sars 1895 : 274-275, pi. 97, fig. 2. 

 Metopella neglecta (Hansen). — Gurjanova 1951 : 473-474, fig. 310. 

 Mesometopa neglecta (Hansen). — Shoemaker 1955a: 24, figs. 8a-f.] 



Description: Lateral cephalic lobe sharp as in Mesometopa neglecta 

 Hansen (Sars. 1895: pi. 97, fig. 2), eye small, composed of 8 to 10 

 large ommatidia loosely arranged ; antennae reaching to end of fifth 

 pereonite; mandibular palp 2-articulate, appearing to be absent on one 

 mandible and present on other; palp of maxilla 1 uniarticulate; 

 gnathopod 1 simple, article 7 not setose; gnathopod 2 small, article 6 

 trapezoidal, expanded distally, palm oblique, sharply defined by a small 

 cusp, bearing two large defining spines; article 2 of pereopods 3-4 

 very slender; article 2 of pereopod 5 broad proximally, suddenly con- 

 stricted on distal half; articles 4 and 5 of pereopods 3-5 very slender, 

 not produced distally; third pleonal epimeron projecting strongly pos- 

 teriorly ; telson with 2 marginal spines on each side. 

 Holotype: AHF No. 5920, female, 3.0 mm. 



Type locality: Station 6806, Santa Cruz Canyon, California, 33°- 

 56'-06" N, 118°-52'-17" W, 221 m, December 22, 1959. 

 Material: Four specimens from the type locality. 



Remarks: Mesometopa gibbosa Shoemaker (1955a) should be re- 

 moved to the genus Metopella Sars because the second article of pereopod 

 5 is slender. The remaining 3 species, Mesometopa esmarki (Boeck), M. 

 extensa Gurjanova and M. neglecta (Hansen), differ among themselves 

 more than the present material differs from M. neglecta, so these speci- 

 mens are relegated to subspecific status. The larger, fewer, and more 

 loosely compacted ommatidia of the new subspecies differ from the more 

 numerous, smaller, more compacted ommatidia of the stem species and 

 the proximal and distal portions of article 2 on pereopod 5 are more 

 sharply differentiated. The palm of gnathopod 2 has a small medial 

 cusp, not reported for M. neglecta neglecta. Probably the eye differ- 

 ences are a reflection of the greater depth recorded for the new sub- 

 species. 



Metopa (Prometopa) samsiluna, new species 



(Fig. 42) 

 Diagnosis: Assigned to the subgenus Prometopa Schellenberg by 

 possession of a vestigial accessory flagellum; mandibular palp 3-articu- 



