Phyllopoda of Australia. 249 



rounded, anterior rather produced and obtusely truncated at the 

 tip ; shell in young specimens more regularly oval or elliptical in 

 form, with the umbones not at all projecting. Shell in adult 

 male much narrower than in female, seen from the side, oblong 

 oval in form, umbones not very prominent, dorsal margin nearly 

 horizontal, posterior extremity broadly expanded. Valves rather 

 thin, and provided in fully grown specimens with numerous lines 

 of growth, in young ones, as usual, with a much smaller number 

 of such lines. Head triangular, with the frontal part narrowly 

 produced, and having the usual affixing organ ; rostral expansion 

 in female much shorter and blunter than in male, and in both 

 sexes defined from the frontal part by an obtuseangular notch. 

 Legs, 17 pairs in female, 18 pairs in male ; epipodites, or gills, 

 not particularly large. The two anterior pairs of legs in male 

 subsimilar, prehensile ; hand rather expanded, with a triangular 

 projection inside ; claw very strong, and tipped by a small suck- 

 ing disk, thumb obtuse, densely clothed with curved spinules and 

 carrying a small setous lobe, subapical appendage biarticulate. 

 Tail with about ten denticles on each side. 



Length of adult female 10 mm., of male 11 mm. (G. O. Sars). 



Remarks. — Professor Sars refers with doubt as a synonym 

 Estheria compressa, Baird, from India, and also says Eulimnadia 

 sordida. King, from N.S.W., may be specifically identical. I 

 think it more likely, however, as previously stated, that the 

 latter agrees with E. rivolensis, which I have had an opportunity 

 of examining and Sars had not. 



Distribution. — Coogee, N. S.Wales (King) ; near Sydney (Sars) ; 

 and, if Baird's Estheria compressa is really a synonym, also in 

 India. 



Genus 3— Limnadopsis, Spencer and Hall, 1896. 

 1. Limnadopsis birchii (Baird). 



Estheria birchii, Baird. Proc. Zool. Soc. London, 1860, p. 

 392, pi. Ixxii., fig. 1 a-e. 



Limnadopsis squirei, Spencer and Hall. Report Horn Expe- 

 dition, ii., p. 239, figs. 15-19. 



Messrs. Spencer and Hall agree with me that their L. squirei 

 is in specific agreement with Baird's Estheria birchii^ — which, 

 however, is a normal Limnadopsis. 



