DESCRIPTION OF PLATE XXI. (VOL. II.) 

 CRUSTACEA. AMPHIPODA. 



A. 



Orchcstia plataisis Kroyer. 



At the top ; lateral view of head and gn athopods, with lateral view of pleon immediately below. 

 a. s. First antenna. 



gn. 1, 2. First and second gnathopods of the male, with portions more highly magnified. 

 j/r/>. I, 3, First and third uropods. 



mx/>. Maxillipeds, with palp of one side detached. These are from a second (male) specimen. 

 gn. I ? , gn. 2 ? . First and second gnathopods of a female specimen, with terminal part of gn. i more 

 highly magnified. 



B. 



Orchcstia pickeringh Dana. 

 O. P. gn. 2. Second gnathopod of male. 



C. 



Paroichestia /imcaiensis Dana, $. 



At the top ; lateral view of head and gnathopods. 

 /. s. Upper lip. 

 nixp. Maxillipeds. 



gn. I, 2. First and second gnathopods, with portions more highly magnified. 

 tcrp. I, 2, 3. First, second, and third uropods, third also more highly magnified. 



T. Telson, to the same scale as the uropods, and also more highly magnified, to the same scale as 

 upper lip and maxillipeds. 



