480 ON SOME NEW AUSTRALIAN MARINE ISOPODA, 



the peduncle very short and broad, second narrower and slightly 

 longer, thii'd scarcely distinguishable from the flagellum ; 

 flagellum about twice as long as the peduncle. External antennae 

 longer than the body, the three basal joints of the peduncle short 

 and stout, the third the longest of the three and provided distally 

 and externally with a short, acute spine ; flagellum shorter than 

 the peduncle. Penultimate joint of the maxillipedes not expanded. 

 First pair of thoracic limbs large ; propodos sub-triangular in 

 outline, the palm transxerse, concave, armed with a few short 

 bristles, and defined by a prominent acute tooth ; dactylos much 

 longer than the palm. Following pairs of thoracic limbs decreasing 

 slightly in length posteriorly. Caudal aj)pendages with the inner 

 ramus longer than the outer, both broad-lanceolate, truncate, 

 with one or two lateral notches and a few long, slender setse. 

 Length about 5 16 inch. 



Hah. Port Jackson. 



Explanation of Plates XVI. -XIX. 



In all the figures a — inner antennae ; h — outer antennae ; c — 

 first pair of pereiopoda ; d — mandibles ; e — first pair of maxillae ; 

 / — second maxillae ; g — maxillipedes ; x — terminal segment or 

 caudal appendages. 



Plate XYI. 

 Fig. 1. Codonopldlus argus, five times the natural size. 

 ,, 2. Rocinela vigilans, natural size. 

 ,, 3. Splimroma aspera, seven times the natural size. 

 ,, 4. Sjyhceroma anomala, four times the natural size. 

 ,, 5. Sjjlmroma Icevis, five times the natiu^al size. 

 ,, 6. Cgmodocea aculeata, twice the natural size. 



Plate XYII. 

 Fig. 1. C'jmodocea 2)i('i'iscens, ii^iwYdiX ^\zQ. 

 ,, 2. CiUccva tenuicaudata, three times the natural size. 

 ,, 3. Cilic(Ba crassicaudata, three times the natural size. 

 ,, 4. Calgptura caniea, four times the natural size. 



