102 CARL BOVALLIUS, THE OXYCEPHALIDS. 



segment being sculptured on the sides and showing large 

 grooves. The body increases in breadth from the first peraeon- 

 al segment to the middle of the fifth, then narrows abruptly 

 towards the pleon; the fifth epinieral thus shows an angular 

 protruding tubercle. 



The head is longer than the first six perseonal segments 

 together; the rostrum is not fully as long as the rest of 

 the head, and is triangular, and sharp-pointed. 



The first four joints of the second pair of antennae are subequal 

 in length, and are feebly bent. 



The first pair of perceopoda have the under margin of the 

 carpus serrated, with the hind corner feebly projecting, and 

 sharp-pointed; the hind margin of the carpus is also serrated; 

 the hind margin of the metacarpus is serrated, without 

 spines, and is shorter than the under margin of the carpus. 

 The second pair have the under margin of the carpus 

 serrated, and the hind corner does not project more than in 

 the first pair; the hind margin is notched, and provided 

 with four or five spinelike bristles; the hind margin of the 

 metacarpus is serrated, and is nearly as long as the under 

 margin of the carpus. Along the middle of the femur of 

 the fifth pair there are three pits, on that of the sixth four, 

 and on that of the seventh pair three pits and some larger 

 grooves at the apex of the joint. The seventh pair are 

 much longer than the femur of the sixth, and reach beyond 

 the apex of the tibia. 



The pleon is a little longer than the last four perseonal seg- 

 ments together; the under margin of the pleonal segments 

 is feebly convex; the hind corner is squared, and not at 

 all produced. 



The last coalesced ural segment is a third part longer than 

 the telson. 



The first pair of uropoda reach to the apex of the last pair. 

 The rami are narrowly elongate. 



The telson is almost lanceolate, and reaches scarcely beyond 

 the apex of the last pair of uropoda. 



Stebbingella The"eli is very similar to S. sclerotica in form, 

 and if there were not the differences in the armature of the first two 



