GAMMARIDEAN AMPHIPODA 199 



Parapleustes den, new species 



Figure 54 



Diagnosis.- — Eyes reniform; lateral cephalic lobes obtuse; antenna 

 1 longer than first 5 body segments; body lacking dorsal processes; 

 pereopods 1-2 not formed into spinose grasping organs; gnathopods 

 large for genus, fifth articles bearing densely setose posterior lobes, 

 palms not distinct from posterior margins of sixth articles, lacking 

 medial cusps, densely setose; telson linguiform; pleonal epimeron 3 

 slightly sinuous posteriorly, prolonged acutely at posteroventral 

 corner. 



Holotype.— AHF No. 559, male, 8.0 mm. 



Type locality.' — Barnard station 6, Corona del Mar, California, 

 wash of masses of Phragmaiopoma sp., February 6, 1955. 



Material. — 16 specimens from the type locality. 



Relationship.- — The densely setose gnathopods lacking distinct 

 palms distinguish the species from all others in the genus except for 

 the dorsally processiferous Parapleustes monocuspis (Sars, 1895) and 

 P. bicuspis (Kr0yer, see Sars, 1895). 



Parapleustes nautilus, new species 



Figure 55 



Diagnosis. — Eyes oval, small; lateral cephalic lobes obtuse; 

 antennae not longer than first 4 body segments; body lacking dorsal 

 processes; pereopods 1-2 not formed into spinose grasping organs; 

 gnathopods medium in size for genus, fifth articles with blunt, rather 

 broad, short posterior lobes, sixth articles rectangular, palms oblique 

 but shorter than posterior margins of sixth articles, palms smooth, 

 lacking microscopic teeth or processes, /defined by 3 spines, posterior 

 margins of sixth articles with another set of proximopalmar spines; 

 pereopods and uropods short; telson linguiform; third pleonal epimeron 

 with nearly straight but slightly sinuous posterior edge, ventral 

 corner weakly quadrate. 



References: 



Parapleustes assimilis (Sars, 1895, as Paramphitho'e) 



Parapleustes bicuspis (Kr0yer): Sars (1895, as Paramphilhoe) 



Parapleustes commensalis Shoemaker (1952) 



Parapleustes den J. L. Barnard, n.sp., herein 



Parapleustes derzharini (Gurjanova, 1938, as Neopleustes) 



Parapleustes gracilis Buchholz: Sexton (1909) 



Parapleustes johanseni Gurjanova (1951) 



Parapleustes major (Bulycheva, 1952, as Neopleustes) 



Parapleustes monocuspis (Sars, 1895, as Paramphilhoe) 



Parapleustes nautilus J. L. Barnard, n.sp., herein 



Parapleustes oculalus (Holmes, 1908, as Neopleustes) 



Parapleustes pacificus (Walker, 1898, as Paramphitho'e) 



Parapleustes pugettensis (Dana): Barnard and Given (1960), Shoemaker (1964) 



Parapleustes sinuipalma Dunbar (1954) 



Parapleustes trianguloculatus Bulycheva (1952) 



280-102 0-69— 14 



