STALK-EYED CRUSTACEA 475 



as the carapace, the posterior surface of which it overlaps. 

 The telson is long, slender, .and tapering. The appendages 

 are two-branched, narrow, and subfoHaceous. 



The eyes are short, and carry a small ocellus. The 

 peduncle of the internal antennae is short ; the first joint 

 is excavated on the upper surface, and has a stout spine ; 

 the second and third joint cylindrical. The external 

 antennae are long and slender, and the basal scale 

 articulates between two strong teeth. 



The cutting edge of the mandible is serrate, and has 

 a two-jointed palp. The first pair of maxillipedes is 

 subpediform, seven-jointed, with a large external ap- 

 pendage. The external maxillipede is long, pediform, 

 and five-jointed, with a long external appendage ; its first 

 joint carries a lunate calcified plate that articulates with a 

 rudimentary branchial plate, with no gill plume attached. 



The first two pairs of legs are short ; there is an ex- 

 ternal appendage from their second joint. 



The gills are attached to the chest wall, to the 

 membrane between the first joint of the two maxillipedes 

 and the four first pairs of legs, and the body of the 

 animal. All these appendages, except the last two pairs 

 of legs, have branchial plates, of which the one of the 

 first maxillipede has a branchial plume. 



Range. — Atlantic, Australian and New Zealand Sea ; 

 in deep water. 



Synopsis of the Species. 



I. Rostrum long, thin, and upturned. 



a. Rostrum has four spines above and more than forty- 

 five below. — {A. eusis?) 



b. Rostrum has five spines above and one below, near 

 tip. — i^A. arrnata.) 



c. Rostrum has above three or four spines over base. 



