Phyllopoda of Australia. 243- 



Trunk elongated and very movable ; caudal part well developed, 

 curved downwards, forming posteriorly two juxtaposed dentated 

 lamellae, and terminating in two movable claws. First pair of 

 antennae more or less elongated, and generally lobed in one 

 margin ; second pair with slender rami, considerably longer than 

 the scape. Masticatory part of the mandibles without distinct 

 teeth. Legs numerous (16-28 pairs), with comparatively short 

 endites ; dorsal lobe of exopodite in the female elongated, in two 

 or three of the middle pairs, into filiform appendages, supporting 

 the egg-mass. (G. O. Sars). 



Synopsis op Local Genera. 



(A) Head possessing a frontal clavate process ("haft" or "affix- 

 ing" organ). First two pairs of legs in male prehensile. 



1. Shell much compressed, thin, ovoidal, pellucid, lines of 



growth inconspicuous, few ; no trace of umbones. 

 Animal not crowded within the shell ; about 18 pairs 

 of feet. Bisexual. — Eulimnadia. 



2. Shell much compressed, parchment-like, dorsum possessing 



a longitudinal series of spiny processes ; lines of 

 growtli conspicuous ridges ; umbones minute. Feet 

 numerous, 26-32 pairs. — Limnadopsis. 



3. Shell compressed, rather thin, ■ male differing very con- 



siderably from female in form ; lines of growth 

 inconspicuous, very numerous ; umbones large and 

 prominent. Otherwise like Eulimnadia. — Para- 



LIMNADIA. 



(B) Head without a frontal appendage. Shell with more or 

 less prominent umbones. 



4. Shell orbicular, thin, smooth, lines of growth few (about 



7). Antennulae simple; only first pair of legs in 

 male prehensile. — Cyclestheria. 



5. Shell oval, more or less globose, generally brownish in 



colour, lines of growth conspicuous, numerous (about 

 10-20). Antennulae lobed. First two pairs of legs, 

 prehensile in the male. — Estheria. 



