ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 545 
Fam. Peripiip”. 
Genus Alteutha, Baird, 1845. 
Alteutha austrina, new species. (PI. X. figs. 9-15.) 
Female.—Body depressed, expanded laterally, and having a general resemblance 
to Alteutha depressa, Baird. Length of the specimen represented by the drawing 
(fig. 9), 0°92 mm. 
Antennules composed of nine joints; the second joint, which is the longest, is 
about equal to the third and fourth joints combined; the seventh and eighth, 
which are about equal in size, are smaller than any of the others (fig. 10). Second 
maxillipeds small, with the end joint short, and armed with a moderately stout 
terminal claw. 
The outer ramus of the first pair of thoracic legs is considerably longer and stouter 
than the inner, and both rami are three-jomted—the joints of the outer ramus are 
subequal in length. The next three pairs are slender and similar to those in Alteutha 
depressa. 
- The fifth pair also resemble those of the same species: they consist of thin and 
moderately narrow and elongated plates with a subcentral and longitudinal hyaline 
band, as indicated in the drawing (fig. 14); each foot is two-jointed, but the articula- 
tion between the joints is sometimes not very clearly defined. ‘lhe basal joint is short 
and carries a moderately stout spine on its outer distal angle; there is also a stout 
spine and a few small spinules at the extremity of the second joint, and the inner 
margin of this joint is obscurely crenulated, as shown in the figure (fig. 14). 
Caudal rami short, moderately broad, and furnished each with one long and three 
(or four) short terminal bristles (fig. 15). 
Habitat.—Scotia Bay, South Orkneys, obtained in siftings from some dredged 
material collected in June 1903; Station 325, 60° 43’ 42” S., 44° 38’ 33”_W. 
Though this species resembles in some respects Dr Barrp’s Alteutha depressa, it 
differs from it in some important details, as indicated in the description given above. 
Alteutha dubia, new species. (PI. X. figs. 1-8.) 
Female.—Body depressed, expanded laterally, as in Alteutha depressa, Baird ; 
rostrum prominent. Length, 1°4 mm. 
Antennules composed of nine joints; the second is considerably longer than any 
of the others; the seventh and eighth are small and subequal, and the end joint is 
about as long as the two preceding ones combined (fig. 2). Antenne slender; outer 
ramus small and biarticulate. 
Second maxillipeds elongated, end joint ovate, and armed with a moderately short 
and stout terminal claw (fig. 4). 
The swimming legs are moderately slender, and both rami are three-jointed ; the 
TRANS. ROY. SOC. EDIN., VOL. XLVII1L, PART III. (NO. 24). 81 
