254 Proceedings of the Royal Society of Victoria. 



Locality. — Lake Aurean, Murchison,West Australia, in associa- 

 tion with Artemia westraliensis (collected by J. T. Markes, Esq., 

 January, 1896). 



Re7narks. — I have but one example of this species, a male. It 

 differs materially from E. elliptica, another West Australian 

 species (of which only the female has been described), in the 

 shape of the shell, and, although of much larger size, in a rather 

 less number of ridges, also by not possessing the numerous 

 secondary lines of growth near the outer margins. It is named 

 in compliment to Professor G. O. Sars, the renowned carcinologist. 



4. Estheria lutraria, Brady. (PI. XXXV., Fig. 2 a-e). 



Brady, Proc. Zool. Soc. London, 1885, p. 85, tig. B; Spencer 

 and Hall, Report Horn Expedition, Zoology, ii., p. 234, figs. 4, 5. 



Shell very large, reaching 14 mm. in length, and moderately 

 tumid. Dorsum straight for almost its total length, abruptly 

 curving into posterior margin without any angle, thence obliquely 

 receding anteriorly. Umbones small, narrowly pointed, and 

 very near the anterior limit. Front broadly and evenly rounded, 

 meeting the dorsum in an obtuse angle. Ridges equidistant, 12- 

 16, sometimes with fine bristles, sculpture between irregularly 

 reticulate. Mature forms with tail very short, dorsal lamellae 

 deeply concave (younger forms longer and not so concave), 

 denticles small, few (about 5), one pair in front of anal setae 

 straight and comparatively short, caudal claws thickly clothed 

 on inner margin for half their distance with feathered setae. 

 Dorsum of last few trunk segments without spines, or sometimes 

 very minute ones. Distal dorsal limit of head meeting the hind 

 margin in a right angle. Eyes confluent, area in front con- 

 spicuously swollen. Third pair of legs in male with fourth 

 endite having the lower angle produced downwards as a definite 

 little finger-like process tipped with a few setae ; articulated 

 stylet of fifth endite one-jointed. 



Length of largest shell seen by me, 14 mm. 



Distribution. — Tnnamincka, Central Australia (Brady); valley 

 of Stevenson River, and head of the Anna Creek, Central 

 Australia (S. and H). 



