104 Carl Bovallius, The Oxycephalids. 



the metacarpus; the metacarpus is about twice as long as broad; the 

 dactylus has the hind margin smooth, and is more than half as long as 

 the metacarpus. The second pair (PI. V, fig. 3) have the carpus 

 nearly as long as broad; the lower front corner as well as the hind 

 corner are less projecting than in the first pair. The third and fourth 

 pairs are equal in length, tolerably slender, and considerably shorter 

 than the fifth pair. The fifth pair have the femur much dilated, 

 broadest below the middle, and scarcely more than a fifth part longer 

 than broad; the lower front and hind corners are produced downwards 

 to the middle of the genu; the three pits on the outer side are ovate 

 in form; the femur is as long as the genu, tibia, carpus, and half the 

 metacarpus together. The sixth pair are shorter than the fifth; the 

 femur is much dilated, broader than long, and nearly as long as all 

 the following joints together; the lower hind corner is not produced. 

 The femur of the seventh pair (p. 35, tig. 60) is somewhat longer 

 than all the following joints together, and is about as long as that of 

 the sixth pair. 



The last coalesced ural segment is about a third longer than broad. 



The peduncle of the first pair of uropoda (PI. V, fig. 4) is quite 

 as long as the last coalesced ural segment, and more than three times 

 as long as broad; the inner ramus is much shorter than the peduncle, 

 and much longer than the outer ramus; both rami are serrated on both 

 margins. The second pair reach a little beyond the apex of the 

 peduncle of the last pair, the peduncle is much longer than the inner 

 ramus, which is about a third part longer than the outer; the inner ramus 

 is serrated on the outer margin and smooth on the inner; the outer 

 ramus is serrated on the inner margin and smooth on the outer. The 

 third pair reach almost to the apex of the telson; the peduncle is 

 quite as long as the inner ramus, which is serrated on both margins, 

 and scarcely longer than the outer ramus. 



The telson has the margins smooth, and feebly convex. 



Colour. Bright yellow, histrous a.s if polished, the eyes are dark red. 



Length. 15—21 mm. 



Hab. The Indian Ocean. 



