ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 573 
Fam. ASTEROCHERID 2. 
Genus Asterocheres, Boeck, 1859. 
Asterocheres suberites, Giesbrecht, var. antarctica, nov. var. (PI. VI. figs. 3-11.) 
Like Asterocheres suberites, Giesbrecht, in general appearance. Length, ‘94 mm. 
Antennules composed of twenty-one joints, moderately elongated and slender; first 
joint stouter and longer than any of the others, the second to the eleventh very short, 
especially the last two ; each joint is also somewhat narrower than the one that precedes 
it; the twelfth to the eighteenth are of moderate length and subequal, the three end 
joints rather small, but the penultimate one is somewhat longer than either of the other 
two. The formula shows approximately the proportional lengths of the various joints : 
Number of the joints iP 2ont oot 8 910 11 12 13 14 P16 17.18 19 20 24 
——SV— 
Proportional lengths of joints 21 4 3 3 3 3 3 3 2 3 Been 8 GOs be 4 
Antenne moderately slender and armed with a long claw-like spine; the first and 
fourth joints short, the second and third elongated; outer ramus small, uniarticulated, 
and bearing two or three short terminal bristles (fig. 3). 
Siphon short, somewhat triangular; mandibles styliform; maxille and maxilli- 
peds nearly as in A. suberites, Giesbrecht. 
The four pairs of swimming legs also resemble those of the species named. The 
fifth pair are very small and uniarticulate. ‘The caudal furca are rather longer than 
the last segment of the abdomen, and about equal to the length of the penultimate 
segment (fig. 11). 
Habitat.—Scotia Bay, South Orkneys, June 1903; Station 325, 60° 43’ 42”, 
aA” 38! 33” W. 
Remarks.—The species recorded above so closely resembles Asterocheres suberites, 
Giesbrecht, as to be searcely separable from it. There is a slight difference in the form of 
the siphon ; the outer marginal spines of the exopods of some of the swimming feet are 
stouter, and the fifth pair of feet are distinctly smaller. One or two other slight differ- 
ences may be observed, as, for example, in the proportional lengths of the joints of the 
antennules, and of the abdominal segments, but this Antarctic form can scarcely be 
regarded as more than a variety of A. subervtes. 
Fam. ARTOTROGIDA. 
Genus Artotrogus, Boeck, 1859. 
Artotrogus proxumus, new species. (Pl. XI. figs. 1-9.) 
Description of the Female.—The outline of the female, seen from above, is sub- 
orbicular ; the cephalothoracic’ segment is greatly expanded, and forms the largest 
portion of the animal; the remaining thoracic segments are comparatively small; the 
abdomen is also small, but the genital segment of the abdomen is larger than the other 
segments, and is produced backwards on each side so as partly to enclose them, as 
