Phylloj)oda of Australia. 241 



three examples in the Australian Museum, which were collected 

 from near Yass, N.S.W., that are distinct from the European 

 species. 



Tribe 2. — Notostraca. 



Phyllopods with body more or less covered above by a broad 

 vaulted carapace, which is united anteriorly with the head. 



Family Apodidae. 



Carapace broadly i-ounded in front, slightly vaulted and 

 indented behind, with a distinct transverse cervical furrow 

 defining the head posteriorly ; the latter shovel-formed and 

 exhibiting a crescent-shaped ventral duplicature, behind which 

 the antennae and oval parts are situated. Hind part of the body 

 projecting more or less behind the carapace, and divided into 

 numerous segments, encircled by tine spikes. Caudal filaments 

 very much elongated. Males very rare, considerably smaller 

 than the females, and without special prehensile organs. (G. O. 

 Sars, in part). 



Remarks. — This family contains only two genera, which are 

 closely allied, and have a world-wide distribution. Each is repre- 

 sented in Australia. 



Synopsis op the Genera. 



1. Last caudal segment not prolonged between the caudal 

 filaments to a lamellar expansion. — Apus. 



3. Last caudal segment bearing a lamellar expansion. — - 

 Lepidurus. 



Genus 1 — Apus, Schaeffer, 1756. 



Apus austPaliensis, Spencer and Hall. 



References. — Spencer and Hall, Victorian Naturalist, vol. xi. 

 (1895), p. 16L Spencer and Hall, Report Horn Expedition to 

 Central Australia, part ii., Zoology, pp. 231-234, pi. 20, figs. 1-3. 

 Sars, Arch, for Math, og Naturvid, Christiania, xix.. No. 1, pp. 

 5-12, pi. i. and ii. 



