96 MESSES. NORMAN AND STEBBING ON THE 



slightly emarginate, with a small rounded projection occupying the centre of the 

 emargination. 



Upper antennae (i. a.s) with the basal joint moderately stout, a tactile seta halfway up 

 the outer margin ; second and third joints subequal, their combined length scarcely 

 more than half that of the first joint; filament consisting of about 17, secondary 

 appendage of 4, articulations. 



Lower antennae (i. a.i) reaching to the end of the peduncle of the upper; the scale 

 smaller than usual, only reaching to the middle of the fourth joint, and bearing only 

 four setee, two on the exterior margin and two apical, and none on the interior margin. 



The first gnathopods (i. gn^) are slender and weak, and without much character ; 

 wrist very long, two and a half times as long as meros, with many cilia on the front 

 margin ; hand with the basal portion slender, and scarcely wider than the wrist ; thumb 

 and finger long, without any tubercular processes on the inner margin, the distal 

 portion of that of the thumb beai'ing a series of microscopic fiattened teeth, and short, 

 stiff, obtusely ending cilia ; finger having about five short stumpy spine-like teeth just 

 before the unguis commences. 



Second gnathopods (i. ffn") strongly built, basos naked ; meros having the front margin 

 ciliate, and bearing a distal spine, upper margin with a distal bunch of cilia ; wrist 

 unusually short, scarcely more than half the length of meros, above with many cilia 

 and a large distal spine, below with four cilia and two or three spines ; hand widely 

 ovate, rather longer than the wrist, upper margin with two spines and a few cilia ; 

 palm closely set all round with ten stout spines, but no cilia; all the spines of the limb 

 are stout, but quite simple in character ; finger strong, with four denticulations on the 

 margin. 



Last peraeopods (i.^'?y') slender, basos naked, the three succeeding joints having one 

 or two minute cilia on the front margin, except that the carpus (which is slightly 

 longer than the meros and hand, which are subequal to each other) has a long slender 

 distal spine on the front ; hand with a distal spine above, and two slender spines on the 

 palm, and passing obliquely across the last half of the joint, commencing beyond the 

 middle of the palm and terminating at the upper margin of the origin of the finger, is 

 a pectinated series of lancet-shaped spines, of which the margins are apparently simple. 

 Finger of most unusual length, half as long again as the hand, the unguis especially 

 being very gi-eatly produced. 



Pleopods (i-Jilp) greatly developed, the peduncle long. 



Uropods with one branch consisting of about 7, the other of 18, articulations. 



The foregoing is a description of the females, one of which has incipient growths of 

 the marsupial sac at the base of the 2nd, 3rd, 4th, and 5th peraeopods. 



The males, which are known by the cylindro-columnar sexual organ situated between 

 the last peraeopods, where it takes the place of the ventral spine of the other sex, differ 

 in ha^dng the lateral spines of the peraeon-segments, and both epimeral and ventral 



