i8 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I28 



has a 2-j Dinted palp, which would place it in the genus Proboloides. 

 Specimens of clypeata from the Bay of Fundy and glacialis from 

 Point Barrow and Nunivak Island, Alaska, have been dissected and 

 all have been found to have a i -jointed palp to the first maxilla. The 



Fig. 6.— a-d, Metopa glacialis (KrSyer). Male: a peraeopod i ; fc peraeopod 

 2- c, peraeopod 4; d, peraeopod 5. e-f, Metopa hruzcln (Goes). Female: (? palp 

 of mandible; /, gnathopod i. g-o, Metopa spiincoxa,nev^ species. Male: ^, front 

 part of animal ; /;, head, showing upper lip and epistome ; i palp of mandible ; 

 ;, end of gnathopod i; k, palm and seventh joint, gnathopod 2; /, peraeopod 2; 

 m, peraeopod 4 ; n, peraeopod 5 ; 0, hind end of animal. 



Specimen of Metopa canana, which Stephensen received from Gur- 

 janova, was dissected and found to have a i-jointed palp. In view of 

 the extreme similarity of these three species, it seems possible that 

 the number of joints in the palp of the first maxilla may be a variable 



