PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 519 



gious. Part of the material was obtained near the station, and part at 

 Point Franklin and Norton Sonnd on the return voyage. 



The writer was attached to the expedition as naturalist and observer. 

 The type specimens are in the National Museum at Washington. 



CRUSTACEA. 

 Decapoda. 



1. Pandalus dapifer, u. sp. 



Description. — Length of carapace (including rostrum) contained about 

 2^ times in total length. Rosti^al carina beginning about the middle of 

 the carapace and armed with two or three teeth. Rostrum exceedingly 

 long, nearly H times the length of the carapace, slender and tapering, 

 slightly curved uj), with 5-7 teeth on the upper edge, running only about 

 ^ of the length of the rostrum, leaving the rest unarmed to the tip. Eyes 

 large, pyriform, and black. Peduncle of antennule reaches about to mid- 

 dle of antennal scale, and its distal segment is about ^ the length of 

 the preceding. Internal flagellum of antennule slender, reaching nearly 

 to end of rostrum ; external about § as long as internal, much thick- 

 ened nearly to the tip, where it suddenly becomes slender. Antennal 

 scale a little more than half as long as the rostrum. External raax- 

 illipeds long and slender, reaching nearly to the tip of the antennal 

 scale or about to the middle of the rostrum. First pair of legs very 

 blender, reaching to the tips of the outer maxillipeds. Second (chelate) 

 legs unequal : left very long and slender, reaching to the tip of the ros- 

 trum ; carpus multiarticulate, with about twenty-five joints, of which the 

 distal twenty or so are separated by distinct articulations; right leg 

 much shorter, reaching only to tip of antennal scale, with a carpus of 

 about seven joints only ; distal joiut of carpus in each leg equal in 

 length to preceding two, the rest about as long as broad. Right chela 

 a little the larger, both alike otherwise, hardly stouter than carpus; 

 digits equal, slightly gaping, and a little shorter than the basal portion. 

 Third, fourth, and fifth pairs of legs long and slender, reaching nearly to 

 the tip of the antennal scale. Abdomen rounded above except the third 

 segment, which is compressed and keeled. This keel is produced into 

 a blunt backward-pointing hook in the male. Sixth segment once and 

 a half as long as the fifth and equal in length to the telson. Telsou 

 rounded at the tip and armed with three pairs of spines. 



Dredged in abundance off Point Franklin, in 13A fathoms, August 31, 

 1883. 



Museum No., 78S1. 



SCHIZOPODA. 



2. My sis rayii, n. sp. 



This species belongs to the same division of the genus as M. vulgaris, 

 having the telson entire and the antennal scale fringed on both sides 

 with setae. It may at once be distinguished from M. vulgaris, by the 

 shape of the rostrum, which is quadrangular, with rounded corners. 



