SiMOKIlYNCHOTUS LiLLJEBORGI. 53 



ramus of tlie second pair is longer than the peduncle. The 

 outer ramus of the last pair is fully three-fourths as long as 

 the inner. 

 The telsnn is longer than broad, and rounded at the apex. 



Si/n. 1S87. Siiiiorhynchotus Lilljeborgi, C Bovaijjus. 35, p. .34. 



This species is remarkable for the globular, not produced head, 

 and is besides easily distinguished from its congeners by the charac- 

 teristics recorded above with respect to the uropoda and the telson. 



The upper surface of the hearl rises a little above the dorsal line 

 of the person. 



The lower hind corner of the first flagellar joint of the first pair 

 of antenna' is produced downwards, and reaches a little beyond the under 

 margin of the second flagellar joint. The third flagellar joint is longer 

 than the second; the fourth is still longer, but much shorter than the 

 two preceding joints together. 



The fifth perceonal segment is as long as the sixth; the seventh 

 is as long as the sixth. 



The metacarpus of the first pair of pera3opoda (p. 32, fig. 

 50; PI. I fig. 4 — 7) is as long as the carpus; the dactylus is near- 

 ly a third as long as the metacarpus. Tiie carpus of the sec- 

 ond pair is a third longer than it is broad at the lower end; 

 the free part of the under margin is more than half as long as 

 the hind margin of the metacarpus; the lower hind corner is ob- 

 tusely rounded; the dactylus is about a third as long as the meta- 

 carpus. The fifth pair are as long as the peraeon and the first pleonal 

 segments together; the femur is about twice as long as broad, much 

 shorter than the three following joints together, and almost as long as 

 the metacarpus. The femur of the sixth pair is scarcely longer than 

 broad, is almost circular, and much shorter than the three following joints 

 together; the carpus is longer than two-thirds of the tibia, and more 

 than half as long as the metacarpus. The seventh pair reach beyond 

 the middle of the tibia of the sixth pair. 



The first two pleonal segments together are shorter than the last 

 four perEeonal segments together. The lateral parts of all the segments 

 are slightly rounded below, and that of the last is angular behind. 



The first segment of the luufi is somewhat longer than the last 

 coalesced, which is about as long as the telson. 



