336 DR THOMAS SCOTT ON THE 



length ; the margins taper gently towards the bluntly rounded anterior end, but 

 behind they converge somewhat abruptly, the posterior extremity being slightly 

 produced and expanded ; the dorsal margin also shows a slight foliation. The general 

 surface of the shell is sculptured with numerous small rounded pits. Length of the 

 shell about '85 mm. 



Habitat. Scotia Bay, South Orkneys; collected June 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. 



Cythere latibrosa, new species. (PI. XIV. figs. 3 and 4.) 



This form, seen from the side, is somewhat similar in its general outline to that 

 described above, but differs in the following particulars : it is higher in front in pro- 

 portion to the length, the dorsal slope is rather greater, and the shell sculpture is 

 rather different. Seen from above, the shell is somewhat tumid, the outline very 

 irregularly hastate, greatest width equal to about half the length ; lateral margins 

 incurved in the middle, converging gently in front, and abruptly behind ; both ex- 

 tremities somewhat truncated, the posterior end rather more so than the other, and with 

 two or three tooth-like projections. Surface of the shell sculptured with numerous 

 irregular and angular excavations. Length, '74 mm. 



Habitat. Scotia Bay, South Orkneys; collected June 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. 



This species has a somewhat close resemblance to Cythere wyville-thompsoni, 

 G. S. Brady, but the anterior serrations observed in that species are wanting in this, 

 and the armature of the posterior end also differs. 



Cythere foveolata, G. S. Brady. (PI. XIV. figs. 7 and 8 ($), and figs. 13 and 14 ().) 

 1880, Cythere foveolata, Brady, Ustracoda of the " Challenger" Exped., p. 75, pi. xiii. 5, e-h. 



Shell of the female tumid ; seen from the side, subrhomboidal, highest in the 

 middle, greatest height rather more than half the length ; both ends obliquely rounded ; 

 dorsal margin gently rounded in the middle part, then sloping somewhat steeply 

 towards each end, but more distinctly so in front ; ventral margin slightly sinuate in 

 front, and curving upwards behind. Seen from above, the shell is broadly ovate, 

 widest in the middle, greatest width equal to about half the length ; sides slightly 

 arcuate in the middle, converging rapidly to the pointed anterior extremity, but 

 abruptly rounded behind. Shell surface marked all over with closely set and con- 

 spicuous excavations, and with the hinge line somewhat prominent. The outline of 

 the male is more compressed and angular. Length, female 77 mm. ; male '74 mm. 



Habitat. Scotia Bay, South Orkneys; collected June 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. 



The Scotia specimens differ slightly from those recorded by Dr BRADY in being 

 somewhat larger and in the general contour being also slightly different, but notwith- 

 standing these differences, I am inclined to consider them as belonging to BRADY'S species. 



(UOY. SOC. EDIN. TRANS., VOL. XLVIII., 582.) 



