326 Rev. T. R. R. Stebbing on new 



proxinially, where there is a little gap left, and distal Ij, 

 wliere the point of the finger overlaps it. 



The Female. — The upper antenna are smaller than in the 

 male, tlie middle joint of the peduncle not longer than either 

 of the other two joints ; tlie flagellum has five joints. In 

 the lower antenna the last joint of the peduncle is considerably 

 longer than the preceding and is more strongly spined than 

 in the male ; the flagellum in the specimen examined had 

 twenty-two joints. 



The first gnathopods differ little from those of the male 

 except in the complete absence of the pellucid processes on 

 the wrist and hand, the latter being simple instead of sub- 

 chclate ; as in the male its hind margin is fringed with stout 

 round-headed spines ; the subterminal hair in these and many 

 of the other spines on this limb is so thick that it produces 

 the appearance of a cleft head to the spine. 



The second gnathopods are in strong contrast to those of 

 the male, being almost membranaceous. The first joint is 

 narrow at the neck, thence widening out into an oval plate 

 rather more than twice as long as it is broad ; this serves as 

 a protection for the delicate terminal joints, which, when not 

 in use, are twisted round to lie upon it ; the second and third 

 joints arc tolerably muscular ; the wrist is rather inflated, 

 almost transparent, widest near the distal end ; the equally 

 transjiarent hand is rather longer, with numerous spinules 

 near the hind margin, tlie distal end rounded, projecting con- 

 siderably beyond the minute triangular finger, which is 

 inserted at the extremity of the straight front margin, and 

 has its inner edge overlapped by a row of spinules ou the 

 hand. 



Both Sexes. — The upper lip has the free margin finely 

 furred, evenly rounded. The mandil)les have tlie cutting-edge 

 divided into five teeth, of which the terminal one is double ; 

 the inner plate has four teeth, in a single series on the left 

 mandible, but on the right distinguished into two that are 

 large and prominent and two that are small and insig- 

 nificant; there are five ])lumose spines on the left and 

 four on the right mandible ; the molar tubercle is short and 

 stout. The first maxillae have the broad outer plate sur- 

 mounted by nine spines, most of them denticulate ; low down 

 on its convex outer margin is the minute (so-called) palp, 

 two-jointed; the inner plate is narrow, ending in two feathered 

 seta\ The niaxillijicds, as indeed the other mouth-organs, 

 closely resemble those which have been described for 'l\doi- 

 chcstia tuniitht, Thomson, in the Trans. Zool. tSoc. vol. xii. 

 lit. vi., 1887. 



