440 COROPHIIDZE. 



oblong in form, and placed in a very advanced position 

 on the lateral lobes of the head. The superior antenna; 

 are about one-third the length of the animal, and have 

 a jointed flagellum, but little longer than the last joint 

 of the peduncle, and furnished with a secondary ap- 

 pendage consisting of but a single articulus ; the second 

 joint of the peduncle is furnished with about twelve, and 

 the third joint with ten, setose serrations on the under side. 

 The inferior antennse are scarcely longer than the superior, 

 and the flagellum is not so long as the last joint of the 

 peduncle, and consists of four or five large articuli ; the 

 last three, besides having numerous hairs, some of which 

 are slightly fringed with cilia, are armed with spines 

 that assume an increasingly hooked condition as they 

 approach the extremity of the appendage ; these are 

 evidently powerful organs, and much used in climbing, 

 as observed by the late Dr. Leach. The first pair of 

 legs have the hand ovate and tapering, the finger 

 serrated. The second pair have the hand very large, 

 oval in form, except the palm, which is slightly excavated, 

 and furnished with a few plumose hairs ; the finger is 

 slightly serrated upon the inner margin. The coxa of 

 the first pair of legs is much advanced anteriorly, but not 

 very deep, those of the three next succeeding pairs in- 

 crease gradually in depth, and are each about the depth 

 of its respective segment ; the coxa of the fifth pair is 

 not so deep as the preceding, and subequally divided 

 into two lobes. The fifth pair of legs are not longer 

 than the fourth ; the sixth and seventh pairs are longer, 

 and all are very robust. The posterior pair of caudal 



teeth. Althougli we have no doubt but that the error aiises from a miscon- 

 ception of tlie artist, yet being in so extensively circulated a work it is liable 

 to mislead if not noticed. 



