Nov., 1907.] THE VICTORIAN NATURALIST. 119 



flexing evenly tliroughout. Eyes stalked or sessile. Antennary 

 scale small or absent. Auditory organ at base of first antennae. 

 Peduncle of second antennce four-jointed. Mandibles without a 

 secondary cutting edge {laciuia mobilis of Hansen). Maxillipeds 

 and succeeding pairs of legs uniform in general structure, and 

 adapted for walking. Swimming branches (exopods) on all but 

 the last two or three pairs of legs. Branchice forming a double 

 series on all but the 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 two first pairs for sexual 

 purposes. Telson and uropoda normal, together forming a 

 "fan." No marsupial plates (oostegites). 



Fam. I. — AnaspidA'-, Thomson, 1894. 

 Thorax of eight segments. Eyes pedunculated. yVntennal 

 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 brancli. Branchiae on all but the last 

 pair of legs, wliich are without any appendages. Pleopoda with 

 rudimentary endopodite. 



Fam. 2. — KooNUNr.TD^. Fam. nov. 

 In general appearance like Anaspidre. Tiiorax 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 " spine-row " or its 

 efpiivalcnt. Maxillipeds without any trace of gnatho-basic lobes, 

 otherwise like Anaspidse. Branchice and swimming branches of 

 legs like Anaspidse. Last pair of legs flexed in the opposite 

 direction to the preceding ones. Pleopoda absolutely uniramus, 

 except the first two pairs in the male. 



(lenus. — Koonunga. Gen. n. 



Cephalon of about equal 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 downward 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. Antennae long and filamentous, 

 the upper with basal joint of flagellum with sensory modification 

 in the male, lower nearly as long as the upper. 



Mandibles with a three-jointed palp. First mnxillce with a 

 small but distinct palp. No swimming branch on the two last 

 pairs of tlioracic limbs. 



