of the North Atlantic and of North- Western Europe. 715 



the distal outer angle produced and furnislied with two set^; last joint sub- 

 conical, truncate at the apex, where it bears two simply curved setse and a sensory 

 filament with a club-shaped extremity ; attached to the maxilla is also a very 

 large, branchial lamina with numerous (Sars counts thirty-three) ciliated setae. 

 Second pair of maxillse consisting, in the female (PI. lxvi., fig. 15), of a small 

 ovate membranaceous lobe, which bears on its inner margin six small spine-like 

 setse, and near the base a few irregularly disposed small hairs : to the base of the 

 maxilla is also attached an ovate branchial plate fringed with twenty-two seta3, 

 all of them very delicately plumose, except the last two, which are also denser and 

 heavier in outline than the rest. In the male (PL lxvi., fig. 1-4), the maxilla 

 and branchial plate resemble those of the female, but there is in addition a 

 powerful prehensile three-jointed palp, the basal joint of which is very long and 

 irregular in build, its inner margin presenting two angular bisetose prominences 

 between which is a large and deep excavation ; the opposite margin is strongly 

 convex proximally, and irregularly sinuous on its distal half ; second joint slender, 

 not much over one-third as long as the preceding, somewhat angularly dilated at 

 the base, and near the apex bearing two rather long setse ; third joint half as long 

 as the second and rather more slender, terminating in a small, but stout unguis. 

 Attached to the base of the limb on the outer side of the first joint is a small lamina 

 which ends in two long setse. Third pair of maxillse (in the female not observed), 

 in the male (PI. lxvi., fig. 16), forming a strong prehensile four-jointed limb, 

 first joint very slender and bearing two long setae on a papilla in the middle of its 

 outer margin, and a single seta on the inner margin near its junction with the 

 second joint; second joint hatchet-shaped, about equal in length to the preceding, 

 its inner side forming a large angular eminence, to the middle of which are 

 attached two small setse, and near the distal end two rather stout ungues, one 

 much larger than the other ; third and fourth joints much more slender and naked 

 except for a minute seta near the extremity of the last, which ends in a small 

 unguis. At the base of the limb is a semicircular branchial lamina which gives 

 attachment to a series of about fourteen delicately plumose filaments, and has also 

 near the origin of the filament a crescentic row of flask-shajjed follicles (?), one 

 opposite to the base of each filament. The abdomen in both sexes is divided into 

 about ten segments, which have chitinous margins, and are produced downwards 

 like the pleural plates of a lobster ; the dorsal surface is setiferous. Attached to 

 the side of the male abdomen (PL lxvii., fig 16) on the segment in front of the 

 copulatory organs is a pair of small foliaceous appendages which are fringed 

 distally and on the outer mai-gin with numerous very delicate setse. The "caudal 

 laminse form the last abdominal segment (telson). Each of the five preceding 

 segments, in the female (PL lxvii., fig. 15), is furnished with a single dorsal seta, 

 while the seventh, eighth, and ninth segments from the extremity have dorsal 

 fascicles of three or four long setse, as well as some minute spine-like set^e. 



