AUSTRALIAN" MALACOSTBACA. 293 



following segments together. Last six segments of the thorax 

 each ornamented with a regularly arranged row of tubercles 

 their epimeral portion clothed with a long pubescence. First 

 segment of the abdomen with two short triangular processes 

 projecting backwards from its posterior border, separated from 

 one another by an interval equal to a fifth of the breadth of the 

 segment ; on either side of this another, less prominent, tooth. 

 Last segment with two compressed, irregular elevations near its 

 proximal end, each formed by a cluster of five teeth ; rest of the 

 surface smooth. Lateral angles of the notch prominent, acute, 

 projecting beyond the extremity of the mesial lobe, which fills up 

 all the notch and is cemented to its borders except at the apex, 

 which is rounded. Outer ramus of the uropoda very broad, 

 spoon-shaped, closely fringed with hairs, inner narrower and 

 shorter, but projecting a little beyond the angles of the notch. 

 Length about f in. 



Port Stephens. Five fathoms. 



Genus Ceeceis, Milne-Edwards. 



Allied to Spliceroma and Gijmodocea, but with the body longer 

 in proportion to its breadth, the head more elongated and of a 

 subtriangular shape, and the basal joints of the inner antenmc 

 longer. 



506. Cerceis tridentata. 



Cerceis tridentata, Milne-Edwards, Hist. Nat. Crust., t. hi., 

 p. 221. 



Head very much narrowed in front. Last joint of the 

 abdomen convex, covered with a light down, almost triangular 

 and terminated by three closely approximated teeth, the middle 

 one of which is the shortest. Caudal appendages habitually 

 exserted on each side, but capable of being retracted ; the inner 

 ramus transversely truncated at the end, the external much longer 

 and pointed. [M.-U.] 



King Island (Mus. Paris). 



507. Cerceis bidentata. 



Cerceis bidentata, Milne-Edwards, 1. c. 



Head broader anteriorly. Last joint of the abdomen smooth, 

 eonvex, presenting above two small bosses, and terminating in 



