1888.] AUSTRALIAN CLAD CERA. 41 



above described species of Macrothrix was hatched (Crescent 

 Lagoon). 



Fam. Lynceidce. 

 Gen. Dunhevedia, King. 



Generic Characters. — Carapace very tumid, rounded oval 

 in form, narrowly truncate posteriorly; valves widely gaping in 

 the middle, inferior edges densely fringed with delicate ciliated 

 bristles. Head somewhat movable, very broad, clypeiform, pro- 

 duced iuferiorly to a sharp rostrum. Eye rather large, with 

 distinctly projecting crystalline lenses; ocellus much smaller and 

 of usual structure. Antennulae provided anteriorly with a slender 

 bristle, arising from a knob-shaped projection. Antennae of mo- 

 derate size, both branches triarticulate, with first joint longer 

 than the two others taken together; lower branch with 4, upper 

 with 3 slender natatory setae. Labrum produced inferiorly to a 

 large securiform projection. Legs of usual structure. Tail 

 strongly angular beyond the anal orifice, outer part slightly ta- 

 pering, with numerous small denticles along the dorsal edge; 

 caudal claws unusually short and much curved, with a single 

 secondary denticle at the base. Intestinal tube forming a double 

 loop in the middle. 



Remarks. — This genus, proposed by King for two Aust- 

 ralian Lynceidse, must I think be retained, as none of the species 

 can properly be referred to any of the known European genera 

 as yet established, whereas they would both seem to be nearly 

 related. In some respects the genus would appear, so to speak, 

 as intermediate between the genera Chjdorus and Pleuroxus of 

 Baird, differing alike however from both. I have been enabled 

 to examine one of the species, viz.: 



