64 



B. W. Kunkel, 



wanting. First maxillae with inner plate moderately long and slender, 

 provided apically with 2 plumose spines ; outer plates somewhat 

 longer than inner, furnished with forked and branching spines api- 

 cally ; palp very small, being represented by small spine on outer 

 margin of outer plate. Maxillipeds with small inner plate which 

 reaches scarcely as far as distal end of first joint of palp and is pro- 

 vided with 3 toothlike spines alternating with plumose spines on 

 apical margin ; outer plate about as wide as inner but reaching 



Fig. 24. Orchestia platensis Kroyer. 



nearly to extremit}' of second joint of palp, rounded apically and 

 provided with numerous stout setae on inner margin and apex ; 

 palp 3-jointed, stout, first joint not as long as wide, becoming broader 

 distally, second joint also broader than long and furnished with a 

 lobe on inner margin which is provided with setae similar to those 

 of outer plate and extending beyond proximal margin of last joint 

 which is rounded apically and slightly longer than wide, bearing 

 apically several short setae. 



In female, first gnathopods smaller than second ; with subtriangular 

 epimeron having ventral margin slightly indented by broad notch ; 



