AMPHIPODS FROM NORTH AMERICAN WEST COAST — SHOEMAKER 409 



Figure 9. — Sympleustes cornigera, new species, male: a, entire animal; h, cutting-edge of 

 right mandible; c, spine-row of right mandible; d, maxilla 1; e, maxilliped;/, end of inner 

 plate of maxilliped; g, end of gnathopod 1; h, end of gnathopod 2. 



of 9 setae. Maxilla 2, inner lobe broadly oval; outer lobe narrower, 

 slightly longer, curved slightly inward. Maxilliped rather large; 

 inner plate short, not reaching base of palp, armed on inner distal 

 margin with row of about 6 short spine-teeth (fig. 9/); outer plate 

 short and narrow, barely reaching base of second joint of palp, with- 

 out spine-teeth but bearing slender spinules on inner margin and 

 apex; second joint of palp longest; third joint with apex angular; 

 fourth joint slender, but as long as third. 



Gnathopod 1 rather stout; second joint nearly as long as fifth and 

 sixth combined; fifth about K length of sixth; sixth joint about % 

 as wide as long and widest ttu-ough middle; palm oblique, convex, 

 smooth, bearing small tooth near hinge, without defining angle, but 

 defined by row of 6 long spines on outside, and on inside by 4 rows of 

 spines, below which are several groups of more slender spines (fig. 

 9^) ; seventh joint rather slender, fitting palm. Gnathopod 2 strongly 

 developed, second and third joints combined as long as sixth; third 



