ENTOMOSTRACA OP THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 315 



middle of the outer margin ; two, close together, at the apex ; and two, also close 

 together, situated nearly intermediate between the apical seta; and the outer one ; there 

 is also a seta on the lower half of the inner marsjin, as shown in the drawing 

 (fig. 28). Tail segments very short. 



IIa}>itat. — In siftings from Gulf-weed collected by the Scotia off the Canary Islands 

 on 29th June 1904 ; Station 537, 29° 54' N., 34° 10' W. 



Fam. CanthocamptidyE. 



Genus Ameira, Boeck, 1865. 



Ameira dmidans, new species. (PI. VII. figs. 23-28.) 



Female. — Body resembling Ameira tan (Giesbrecht) in its general appearance. 

 Length, 0'6 mm. 



Antennules composed of eight joints ; the second joint is large and nearly one and 

 a-half times longer than the next, and about twice as long as the fourth joint, but the 

 two end joints are very short. The approximate proportional lengths of the various 

 joints are shown by the formula : 



Number of the joints 1 2 3 4 5 6 7 8 

 Proportional lengths 6 118 6 4 5 2 2 



The first pair of thoracic legs, and also the following three pairs, are all somewhat 

 similar to those in Ameira tau already referred to. 



The fifth pair are very small ; the inner portion of the basal joint, which is trans- 

 versally truncated at the end, is furnished with five setae — four of them on the trun- 

 cated apex and one on the lower half of the inner margin ; the second joint (or 

 segment) is tolerably expanded at the l)ase, and tapers towards the bluntly rounded 

 extremity ; this joint is also provided with five sette, one of which springs from the 

 outer margin, and the other four from the rounded apex. 



Caudal rami very short. 



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

 60° 43' 42" S., 44° 38' 33" W. 



Remarks. — The species recorded above has a tolerably close resemblance to Ameira 

 tau, described l)y Dr Giesbrecht in his work Die freilebenden Copepoden der Kieler 

 Fiihrde, p. 117 (1882), but it differs in one or two important particulars, and especially 

 in the form of the last pair of thoracic legs. 



Genus ParastenJte/ia, I. C. Thompson & A. Scott, 1903. 

 Parastenhelia antarctica, new species. (PI. IV. figs. 25-33.) 



Fetnale. — Somewhat similar to Parastenhelia anglica, Norman & Scott, in its 

 general appearance. Length, 0'85 mm. 



Antennules composed of nine joints, the first two or three moderately stout, the 



(ROY. SOC. EDIN. TRANS., VOL. XLVIII., 561.) 



