ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 299 



Fam. Peltidiid^. 



Genus Alteutha, Baird, 1845. 



Altentha 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-jointed — the joints of the outer ramus are 

 subequal in length. The next three pairs are slender and similar to those in Alteutha 

 de2yressa. 



The fifth pair also resemble those of the same species : they consist of thin and 

 moderately narrow and elongated plates with a subeentral 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. The 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 spmules 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 Baird's Alteutha depi-essa, 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, I'i 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). Antennae slender ; outer 

 ramus small and biarticulate. 



Second maxillipeds elongated, end joint ovate, and armed with a moderately short 

 and stout teruiinal claw (fig. 4). 



The swimming legs are moderately slender, and both rami are three-jointed ; the 



(ROY. SOO. EDIN. TRANS., VOL. XLVIII., .'>4.").) 



