740 THE VOYAGE OF H.M.S. CHALLENGER. 



apex armed with six spines, of which, the outermost is minute, but the two adjoining it 

 are very Large; 



Second Maxillse. — The inner plate longer and much broader than the outer, with 

 many plumose setse and spines on the inner margin, probably twenty or thirty in all; the 

 outer plate carrying eight long spines on the truncate apex. 



MaxilUpeds. — The inner plates not nearly reaching as far as the distal end of the first 

 joint of the i^alp, the inner margin apically produced into a tooth surmounted by a spine- 

 tooth ; the outward slojiing distal margin having two smaller processes, each with a small 

 spine-tooth, and the outer corner carrying three spines ; the outer plates rather long 

 and narrow, butnot reaching the end of the second joint of the palp ; the nearly straight, 

 serrate, inner margin fringed with about fifteen short spines ; there is one on the almost 

 pointed apex, and a few on the surface; the first joint of the palp rather shorter than the 

 second, with two plumose setse on the inner margin ; the second joint with seven setiB on 

 the inner margin and two on the outer apex ; the third joint very slender, with some 

 apical spines or setse ; the finger also very slender, slightly curved, shorter than the 

 preceding joint. 



First Gnatho20ods. — Side-plates triangular, deeper than broad, with the front margin 

 curved, and below forming an acute angle with the hinder margin. First joint reaching 

 beyond the side-plate, broader below than above, the front margin frmged with small 

 spines, the lower ones rather longer and plumose ; the hind margin carrying many long 

 setse, and an apical group of spines ; the second joint much longer than broad, with some 

 spinules in front and behind, and a group of spines on the hinder apex ; the third joint 

 scarcely so long as the second, with a large apical group of spines and some smaller 

 groups on the hind margin ; the wrist as long as the hand and much broader, with 

 groups of spines on the hind margin near and about the apex, also with spines at two 

 points of the front margin near the apex, and a large group round the apex, some of these 

 being longer than the hand on one of the gnathopods, though not upon the one figured 

 in the Plate ; the hand with the distal portion much narrowed, the serrate hind margin 

 strongly fringed with various spines, one of which near the finger is more strongly 

 plumose than the rest ; the front margin is more convex near the base than distally, the 

 two tracts being separated in one of the gnathopods by a group of several spines, in the 

 other by two spines with an interval between them ; there are some apical setules on 

 this margin ; the finger is slender and curved, not nearly half the length of the hand. 



Second Gnathopods. — Side-plates narrow and elongate, the front margin very slightly 

 convex, the hind margin closely interlocking with the following plate, as seems usual in 

 this genus, the lower margin oblique, helping to form the continuous curve from the 

 upper front corner of the first side-plate to the excavation of the fourth. The marsupial 

 plates narrow, -with a few set?e round the apex. First joint of the limb narrow, reaching 

 beyond the side-plate, narrowest near the base, then making a bend forwards, with some 



