ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 585 
ornamented with fine but irregular reticulations, and with the interspaces minutely 
‘punctate; there are also small whitish papillae where the lines intersect. Length of 
the specimen represented by the drawing, ‘5 mm., but another specimen measured 
only ‘53 mm. 
Habitat.—Scotia Bay, South Orkneys; collected June 1903; Station 325, 
Mets 42” S., 44° 38’ 33” W. 
Genus Paradoxostoma, Fischer, 1855. 
Paradoxostoma retusum, G. 8. Brady. (PI. XIV. fig. 26.) 
1890, Paradoxostoma retusum, Brady, Trans. Roy. Soc. Edin., vol. xxxv. p. 513, pl. iv. fig. 20. 
Shell, seen from the side, oblong, narrower in front than behind, highest behind the 
middle ; height rather less than half the length; dorsal margin moderately convex, 
evenly rounded except near the posterior extremity, where it becomes slightly 
flexuous; anterior end narrow, evenly rounded; posterior extremity produced above 
the middle into a bluntly rounded beak, thence, sloping downwards and forwards in a 
nearly straight line, it merges into and becomes continuous with the sinuated ventral 
margin. Seen from above, compressed, widest in the middle, about four times longer 
than wide ; sides evenly rounded, the front end somewhat obtuse, the posterior extremity 
acuminate. Shell smooth, semitransparent, with a few faint impressed lines at the 
posterior end (fig. 26). Length, ‘78 mm. 
Habitat.—Scotia Bay, South Orkneys; collected June 1903; Station 325, 
es AD S., 44° 38’ 33” W. 
The Scotia specimens differ slightly from the form described by Dr Brapy in 
their larger size, as well as to a small extent in their general outline ; the peculiar con- 
formation of the posterior extremity is, however, quite characteristic of the species 
referred to. 
Paradoxostoma antarcticum, new species. (Pl. XIV. figs. 27 and 28.) 
Carapace ovate ; seen from the side, highest behind the middle, height scarcely 
equal to half the length; dorsal margin boldly arched, forming a continuous even 
curve backwards to the blunt angulation of the posterior extremity, but with a longer 
slope to the front than to the rear; anterior end narrow and rounded ; posterior 
obliquely truncated, slightly produced above, thence sloping downwards and forwards 
to meet the ventral margin, which is slightly convex. Shell, seen from above, com- 
pressed, fusiform, widest behind the middle, fully three times longer than broad ; 
extremities equal and acuminate. Surface of shell smooth, with small, round, indistinct 
markings scattered over it. Length, ‘8 mm. 
Habitat.—Scotia Bay, South Orkneys; collected in June 1903; Station 325, 
60° 43’ 42” §,, 44° 38’ 33” W. 
TRANS. ROY. SOC, EDIN., VOL. XLVIII., PART III. (NO. 24). 86 
