2 MR. O. A. SATCE ON A REMARKABLE 



scale present on second joint, or absent. Mandibles without a secondary cutting-edge 

 (lacinia mobilis of Hansen). Maxillipeds and succeeding pairs of legs uniform in 

 general structure and adapted for walking. Swirnming-brancbes (exopods) on all but the 

 last two or three pairs of legs. Branchiae forming a double series on all but tbe last one 

 or two pairs of legs, simple, lamellar, wholly uncovered. Pleopoda natatory, no appendix 

 interna, inner branch (endopodite) rudimentary or wanting, except in the males, when 

 it is modified in the first two pairs for sexual purposes. Telson and uropoda normal, 

 together forming a " fan." No marsupial plates (oostegites). 



Fain. 1. Anaspibj:, Thomson, 1S94. 



Thorax of eight segments. Eyes pedunculated. Antennal scale arising from the 

 second joint. Mandibles with single dentate cutting-edge, " spine-row " or setose ridge, 

 and molar expansion. Maxillipeds with exopodite small, simple, and lamellar ; epipodite 

 quite small and simple, possessing also small gnatho-basic lobes on the inner face. 

 First five pairs of legs with well-developed swimming-branch. Branchiae on all but the 

 last pair of legs, which are without any appendages. Pleopoda with rudimentary 

 endopodite. 



Fam. 2. Koontjngibj;, Sayce, 1907. 



In general appearance like Anaspidae. Thorax with anterior segment fused with the 

 head, leaving seven distinct subequal segments. Eyes sessile. No antennal scale. 

 Mandibles with a single dentate cutting-edge and molar expansion, no definite " spine- 

 row." Maxillipeds without any trace of gnatho-basic lobes, otherwise like Anaspidae. 

 Pleopoda absolutely uniramous, except the first two pairs in the male. 



Genus Koonunga, Sayce, 1907. 



Cephalon about equal in length to the following two segments combined, possessing 

 a short transverse sulcus on each side at about the middle distance, posteriorly to which 

 the margins are produced downwards and inwards. Frontal margin of cephalon scarcely 

 produced, incised above the attachment of the second antennae, forming a small lateral 

 lobe. Eyes small, round, situated on the dorsal surface at the angles formed by the 

 union of the frontal margin and the incisions. Antennas long and filamentous, the 

 upper with basal joint of flagellum possessing sensory modification in the male, lower 

 nearly as long as the upper. 



Mandibles with a three-jointed palp. First maxillae with a small but distinct palp. 

 No swimming-branch on the last two pairs of thoracic limbs. 



Remarks. — The name is derived from the aboriginal name of a creek which runs 

 near where specimens were collected. * 



