ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 661 



The eyes are oval. 



The first antennae have the third and fourth joints obliquely connected, the two 

 together rather longer than the fifth joint, the third carrying eight marginal setae. 

 Of Asterope teres Norman and Brady say that the third joint is 'much shorter than 

 the fourth, divided diagonally so as to form two triangular joints'; but in their figure 

 these joints are as long as the succeeding joint, and in G. W. Mliller's figure they 

 are longer. In the present species the line of articulation is oblique, but does not 

 as in A. teres extend from base to apex of the two joints. The annulated sensory 

 seta of the fifth joint a little dilated at the point from which its numerous branches 

 spring. Sixth and seventh joints very short, the unguis long and slender, with margin 

 crenate or serrate. 



Second antennae with eleven setae on the swimming branch, the first and last 

 rather short, the rest very long, four belonging to the terminal joint, the seven pre- 

 ceding short joints having one a-piece ; the three-jointed secondary appendage has a 

 single seta near the base of its third joint. 



The frontal tentacle is very slender. 



Mandible having the first joint of the palp produced backward at the proximal 

 corner in a rounded lobe armed with a plumose spine and several setae, above which 

 its margin is fringed with about a score of trident-headed spines; on the opposite 

 margin are various setae, two of them annulate and one of these very long; also at 

 the apex of this margin there is an unarmed laminar appendage as long as the 

 following joint. The tapering third joint is fringed with setae along its upper margin 

 and near the apex of the lower. The fourth joint has two strong annulate setae. 



The first maxillae agree with G. W. MuUer's account of these appendages in the 

 present genus. The stem on the lower side forms a rounded projection fringed with 

 stout setae, and on the upper side has an unarmed tapering process adjacent to, and 

 more than half as long as, the gi-eat first joint of the palp, which on the upper side 

 is fringed above and below with setae, an intermediate space being left bare; on its 

 lower side it has the wonderful comb of long, parallel, terminally thickened setae, the 

 extremities of which form a convex line. At right angles to the apex of the first 

 joint is the thin second joint, followed by a minute, setiferous, apical joint. 



The second maxillae consist of a slender curved plate, the concave inner margin 

 of v.hich is fringed closely with short setae, and having attached to it, but not quite 

 in the same plane, the large vibratory lamina, densely fringed on the outer convex 

 margin with long plumose setae. 



The third maxillae (Norman and Brady) or maxillipeds or first legs (G. W. Miiller) 

 are in this species shaped like the blade of a battle-axe, the front margin convex, 

 fringed with plumose setae, and produced at each end to a somewhat acute process, 

 instead of having, as is more usual, one extremity rounded. In Asterope fusca, G. W. 

 Miiller, 1890, a small Japanese species, supposed to be devoid of eyes, the maxillipeds 

 are figured with both ends pointed, Miiller at that date giving this shape as generally 

 characteristic. 



The vermiform limb has the apex beset with rows of minute teeth, and along its 

 distal rings there are some forty spines, some at least carrying four distal pairs of teeth. 



87—2 



