Studies in Lag-una Anipliipoda. 659 



Joint longer and slightly wider tlian the sixth ; palm not well defined; 

 iinger long and serrate. Gnathopod 1 of the mal^ small; second 

 Joint with narrow neck beyond whicli it is greatly and irregularly 

 widened: fiftli Joint very long and wider than sixth; sixth tri- 

 angulär with setose palm not clearly defined; finger long and serrate. 

 Gnathopod 2 of the female with the second Joint rather swelled 

 behind: fifth Joint much shorter than the sixth and produced beliind 

 into narrow lobe in line with the oblique sixth, with six spines on 

 the hind margin : sixth with palm long and extremely oblique, setose, 

 with defining spines at the apex; finger large and strong. Gnatho- 

 pod 2 of the male, second Joint very long, proximally narrowed; 

 fourth Joint long and slender; fifth Joint enorraously produced, swelled 

 in front and produced behind into a long, uni-notched, triangulär 

 process, the notch forming two teetli of which the inner is the 

 smaller; sixth Joint narrow, much shorter than the basal part of 

 the fifth; palm oblique setose; finger long, setose, with bunch of 

 long setae near tip. Pereiopods 1 and 2 with the second Joint 

 produced. Pereiopods 3—5 successively longer. Pleopods well devel- 

 oped, with two rami. Uropod 1 long, both rami and inner edge of 

 peduncle fringed with small, sharp teeth. Uropod 2, inner ramus 

 slightly the longer, toothed on both edges, the outer ramus toothed 

 on the inner edge. Uropod 3, peduncle long, curved, with one out- 

 curved ramus tipped with two spinules. Telson twice as long as 

 broad, slightly cleft between the two rounded lobes which are 

 thickly covered with very minute spines, 



Body ringed and mottled with brown; antennae ringed with 

 orange; bright orange eyes. 



L. 3 — 5 mm. 



From kelp holdfasts from deep water. Laguna Bench, Calif. 



