6 fl. STBWARDSON BRADY. 



dorsal margin boldly and evenly rounded, ventral evenly convex but not so 

 fully arched as the dorsal margin. Seen from above (fig. 3) the outline is ovate, 

 scarcely twice as long as broad, widest in the middle, rounded off in front, strongly 

 mucronate behind. The ventral border of the rostrum is produced into a thin lamina 

 which is partly overlaid by long closely-set hairs, and the posterior border of the 

 subrostral sinus is similarly fringed (fig. 4). Shell-surface closely and very finely 

 punctated throughout, smooth, except on the ventral aspect, where it bears numerous 

 scattered hairs. Just behind the rostral sinus there is a small patch of eleven or twelve 

 subparallel strise, and a short series of stiff" hairs just within the ventral margin : a 

 large black eye-spot just within the dorsal border at its anterior third. 



The shell of the male (fig. 1) is larger and more elongated than that of the female, 

 nearly twice as long as broad, with a less pronounced rostral sinus and a much narrower 

 and more produced posterior extremity, the eye-spot small and situated near the 

 centre. 



Length of the male, 2 • 3 mm. ; of the female, 1 " 7 mm. 



The setse of the terminal fascicle of the antennule in the female are very short — 

 not more than half the length of the limb ; the second (or third ?) seta of the antennae 

 is spinulose (fig. 8) in the female, the remaining setse are simply ringed : the secondary 

 branch of the antenna (fig. 6) is of the usual form, but has an indistinctly jointed 

 appearance at the apex. Principal tooth of the second maxilla (female) (fig. 9) sharp 

 and broadly triangular ; ungues of the caudal lamina (fig. 10) rather strongly pectinate 

 in the female — but only faintly ciliated in the male. The eyes of the male (fig. 5) are 

 pyriform, and deeply pigmented, the frontal tentacle rigid, dilated, and slightly pig- 

 mented at the base. Secondary branch of the antenna of the male large and strongly 

 prehensile (fig. 7), the last joint bulbously dilated at the apex, basal joint bearing a 

 strongly uncinate process. P. antarctica was found rather sparingly in four of the 

 gatherings taken at " No. 4 hole " in a depth of five fathoms. 



The shell was in all cases of a thin, membranaceous character, but I suspect that 

 this may have arisen from the solvent action of the formalin preservative on the 

 mineral matter. 



PODOCOPA. 



Xestoleberis reniformis. 

 (Plate I., figs. 4, 5.) 



Shell of the male seen from the side (fig. 4) subreniform, much narrower in front 

 than behind, greatest height situated behind the middle and equal to half the length ; 

 anterior extremity well rounded, narrow, posterior much wider, not very fully rounded, 

 dorsal margin forming a continuous arch, highest behind the middle, sloping very 

 gradually backwards and with a rather steep curve towards the front, ventral margin 

 rather deeply sinuated in the middle. Seen from above, the outline is broadly ovate 



