new remarkahle Crustacean. 353 



(lacim'a mohilts 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 pnirs of legs. Branc!iia3 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 first two pairs for sexual 

 purposes. Telson and uropoda normal, together forming a 

 "fan.^^ No marsupial plates (oostegites). 



Fam. 1. Anaspidae, Thomson, 1894. 



Thorax of eight segments. Eyes pedunculated. Antcnnal 

 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 gnatliobasic 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 ap- 

 pendages. Pleopoda with rudimentary endopodite. 



Fam. 2. KoonungidaB, no v. 



In general appearance like Anaspidae. Tliorax with ante- 

 rior segment fused with the head, leaving seven distinct sub- 

 equal segments. Eyes sessile. No anteunal scale. Mandibles 

 with a single dentate cutting-edge and molar expansion, no 

 " spine-row " or its equivalent. Maxillipeds without any 

 trace of gnatliobasic lol^es, otherwise like AnaspidaJ. Branchiae 

 and swimming-branches of legs like Anaspidse. Last pair of 

 legs fiexed in the opposite direction to the preceding ones. 

 Pleopoda absolutely uniramous, except the first two pairs in 

 the male. 



Genus Koonunc.a, nov. 



Ce|)halon of about equal length to the following two 

 segments combined, possessing a short transvt-rse sulcus ou 

 each .«ide at about the middle distance, posteriorly to which 

 the margins are produced downward and inwards. Frontal 

 margin of cephalon scarcely })roduced, incised above the 

 altacluncnt ot the second antenme, 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 



Ann. (Sc May. N. tliat. fcser. 8. Vol. i. 23 



