Phyltopoda of Australia. 257 



curved and sometimes almost angular in the middle, umbones 

 close to the anterior extremity, rather prominent lines of growth, 

 in adult specimens, 6-7. Cephalic crest evenly curved dorsally, 

 rostral part obtusely rounded and finely serrated above. Ocellus 

 nearly as large as eye. Antennae with both branches seven- 

 jointed, scape provided at the end above with two or three 

 expansions, densely supplied with recurved spines. Caudal plate 

 with 7-8 pairs of dorsal spines, besides the slender terminal claws, 

 last pair largest, and armed at base with a row of about 10 small 

 secondary denticles. Colour, clear yellowish or corneous, more 

 or less tinged with green. 



Size. — Length of shell in adult ? attaining 5 mm., height 

 nearly the same. (Sars). 



Distribution. — Near Rockhampton, Queensland (Sars); Nagpur,, 

 India (Baird) ; Ceylon (Brady) ; Celebes, East Africa, Brazil 

 (Sars). 



Family 2 — Lynceidne.^ 



Characters. — Shell very tumid ; the valves without lines of 

 growth, and connected dorsally by an imperfect hinge. Head of 

 enormous size, ending in a downward-curved rostrum of a 

 different form in the two sexes. Trunk comparatively short 

 and massive; tail rudimentary. Number of legs not exceeding 

 12 pairs, only the first pair in the male prehensile. (Abbreviated 

 from Sars). 



Genus — Lynceus, Miiller, 1785. 



Syn. — Limnetis, Loven ; Hede-ssa, Lievin. 



Generic Characters. — Shell more or less spherical, smooth, and' 

 without distinct umbones. Head carinated medially, and pro- 

 duced in the female to a more or less pointed rostrum, in the 

 male to one abruptly truncated ; at the .sides of the head a well- 

 developed arcuate fornix. Caudal part very small, not bent 

 downwards, and without dentated lamellae, but covered beneath 

 by an opercular lamella. Twelve pairs of legs in the female, in 

 the male ten. (Abbreviated from Sars). 



1 1 have followed the Rev. T. R. R. Stebbing, who, by the law of priority, restores the 

 genus Lynceus in place of Limnetis. — The Zoologist, ilar., 1902. 



