ENTOMOSTHACA OK THK SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 337 



Cy there (Antarctica, new species. (PI. XIV. figs. 5 and 0.) 



Shell, seen from the side, elongated, highest over the posterior hinge, greatest height 

 equal to rather more than half the length ; the dorsal margin slopes steeply backwards 

 from the highest point, and more gently towards the front, and with a shallow notch 

 near the anterior extremity ; posterior end boldly rounded and somewhat produced 

 below ; anterior end truncated above, rounded below, with a small subcentral projection 

 separating the upper from the lower portion ; ventral margin incurved and sinuous. 

 The shell, seen from above, widest in front, the greatest width equal to rather less than 

 half the length ; sides not very boldly rounded, converging gently backwards to the 

 sharp-pointed posterior end ; anterior extremity blunt and slightly produced. Shell 

 surface thickly covered with minute circular pits. Length, '7 mm. 



Habitat. Scotia Bay, South Orkney Islands; collected June 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. 



Cythere peregrina, new species. (PI. XIV. figs. 11 and 12.) 



Shell, seen from the side, oblong, highest behind the middle, greatest height scarcely 

 equal to half the length ; dorsal margin sloping gently from behind the middle in a 

 nearly straight line towards the front, but the hinder slope is shorter and steeper ; 

 both ends evenly and not very boldly rounded ; ventral margin slightly and evenly 

 convex. Shell tumid when seen from above, widest in the middle, width equal to 

 half the length ; sides rather boldly arcuate and converging towards both ends; both 

 extremities acuminate. Shell covered with numerous and extremely fine lines extend- 

 ing longitudinally over its surface. Length about 75 mm., but varies to some extent : 

 one or two rather larger specimens reach to about 1 mm. in length. 



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

 60 43' 42" S., 44 38' 33" W. 



Genus Xestoleberis, G. 0. Sars, 18G5. 

 Xestoleberis reniformis, G. S. Brady. (PI. XIV. figs. 17 and 18.) 



1907, Xestolelierif reniformis Kraily, National Antarctic l-'.j-fu'il. : Xnlural Ifialnri/, vols. iii.-v., 

 "Oslracci<la," p. 6, pi. i. 1ii,'s. 4, 5. 



A few specimens adult and (?) young of a Xestr>f<'l>n-ix occurred among other Ostra- 

 coda collected in Scotia Bay, South Orkneys ; Station 325, 60 43' 42" S., 44 38' 33" W. 

 They so closely resemble the form described by Dr BRADY in his paper on the " Ostra- 

 coda of the English National Antarctic Expedition" that I ascribe them to the same 

 species. They differ a little from the description and figures given by BRADY, but the 

 peculiar outline of the shell, both when seen from the side and from above, seems to be 

 characteristic of the species. Length of specimen represented by the drawing!;, '62 mm. 



(ROV. SOC. EDIN. TRANS., VOL. XT.VI1I., 583.) 



