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



It will also be more accurate to speak of the inner plates of the maxillipeds as 

 rudimentary or wanting, rather than as wanting without exception or qualification. 



Pardalisca abyssi, Boeck (PL XCIIL). 



1870. Pardalisca abyssi, Boeck, Crust, aniph. bor. et arot., p. 72. 



ISZJr. „ cuspidata, Buclibolz, Die zweite deutsche Nordpolarfahrfc, p. 306, Taf. 1, fig. 3, 



Taf. 2, fig. 1. 

 1870. ,, abyssi, Boeck, De Skand. og Arltt. Amph., p. 486. 



Rostrum short, not very sharp at the apex, lateral lobes of the head not prominent, 

 extending to the lower corners, which are rounded ; postero-lateral angles of the first two 

 pleon-segments acute, not produced, of the third a little rounded ; the hind margin of 

 the third and fourth segments with a pair of dorsal teeth, wider apart on the third than 

 on the fourth segment. 

 Eyes not observed. 



Upper Antennse. — The first joint thick, as long as the two following together, the 

 third not longer than broad, not half the length of the second ; the flagellum much 

 longer than the peduncle, of many short joints (more than forty) ; the secondary flagellum 

 slender, of six joints, together equal in length to the first seven or eight of the primary. 



Lower Antennas. — The peduncle much longer than that of the upper pair ; first joint 

 dilated, gland-cone of the second long, decurrent ; third joint short, scarcely longer than 

 the second ; fourth elongate, narrowing a little distally, fringed above with setules ; fifth 

 joint more slender, a little shorter, similarly fringed ; the flagellum of more than thirty- 

 three joints. 



Upper Lip distally smooth, the broad shallow emargination making it not very 

 unequally bflobed. 



Mandibles. — Cutting edge of the left mandible of great breadth, with a little curved 

 denticle at the top, whence the front margin runs out forwards and downwards, its 

 straightness only interrupted by a little irregular blunt denticulation, then again retiring 

 it forms three large teeth, the first the most prominent, the lowest by far the largest, 

 broken in our specimen, but seen within in readiness for the next change of skin ; the 

 secondary plate is also broad, roughly triangular, its distal border pectinately denticulate, 

 and in general outline looking like a hasty copy of the principal plate, but without the 

 large lowest tooth ; two curved spines, serrate on the concave edge, take their rise at the 

 base of the secondary plate ; the cutting edge of the right mandible is divided into four 

 very pronounced teeth, of which the uppermost and shortest is incompletely subdivided, 

 the lowest but one is the broadest ; near the lower edge of the mandible there are two 

 curved spines, one much broader than the other, with a double pectination on its concave 

 side ; the second which is much slighter seems to rise from the base of the first ; the first 





