8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



the abdomen. It is six times as long as wide and its lateral margins 

 are nearly straight. The abdomen is one-sixth as long and less than 

 half as wide as the fused segment ; it is made up of two segments, the 

 basal one-half as long again and a little wider than the terminal seg- 

 ment. The caudal rami are longer than the terminal segment, four 

 times as long as wide, and nearly parallel. 



The first antennae are entirely concealed in dorsal view, six- 

 segmented and sparsely armed with spines without any setae ; the 

 second antennae are tipped with a stout chela. The movable claw 

 of the chela has a minute spine on its inner margin near the base, and 

 the rigid finger is hollowed for the reception of the tip of the claw. 

 The first maxilla is two-segmented, the terminal segment twice as 

 long as the basal, bent abruptly near its proximal end and armed in 

 the angle of the bend with a small process tipped with a seta. At the 

 tip of the maxilla are two long unequal spines, which are rather stout 

 and slightly curved. The second maxilla is three-segmented, the basal 

 segment stout, the second segment very short and the third segment 

 enlarged distally and tipped with two stout curved claws. This third 

 segment is as long as the other two combined, and its enlarged tip 

 forms beneath the bases of the claws a lobe which is covered with 

 small spines. Behind the bases of the claws on the lateral and dorsal 

 surfaces of the segment are fringes of long hairs. The basal segment 

 of the maxilliped has a large rounded protuberance on its inner margin 

 at the center, and an angular process at the distal end outside the base 

 of the claw. The latter is stout, considerably enlarged at its base and 

 bent abruptly at right angles over the apex of the protuberance on 

 the basal segment. 



The four pairs of legs are biramose, each ramus three-segmented, 

 and the arrangement of the spines and setae as follows : First exopod 

 i-i, i-i, 2-5; endopod o-i. o-i, 0-6. Second exopod i-i, i-i, 2-5; 

 endopod o-i. 0-2, 0-6. Third exopod i-i, i-i, 2-4; endopod o-i, 0-2, 

 0-6. Fourth exopod i-i, i-i, 1-4; endopod o-i, o-i, 0-4. Fifth legs 

 lacking. 



Remarks. — This species is unlike others of the genus in several 

 particulars, whence its specific name. The carapace is exceptionally 

 widened, the second maxillae and maxillipeds are more like those of 

 Kr0yerina, and the middle segment of the second and third endopods 

 carries two setae. But the presence of well-developed stylets, the shape 

 of the carapace, and the presence of dorsal plates on the free segments 

 correspond with those features of the present genus. 



