474 ON SOME NEW AUSTRALIAN MARINE ISOPODA 



produced, rounded. Lateral angles of tlie following segments of 

 the thorax produced, curved backwards, sub-acute. Penultimate 

 segment of the abdomen produced behind into a rounded tubercle ; 

 a pair of sub-conical elevations on the last segment of the 

 abdomen ; notch very shallow, quadrangular ; lobe pointed. 

 Eamiof caudal appendages rather unequal, both extending beyond 

 the extremity of the segment, the outer the longer, the apex acute, 

 curved outwards, the outer border with a conical tooth ; the inner 

 sub-acute. Basal joint of superior antennae very broad, notched 

 distally for the' reception of the second joint. Flagellum of inner 

 antenuEe with twenty-seven articuli ; that of the outer pair with 

 twenty-one. Length of longest specimen one inch 



Ilal). Port Jackson etc. ; common. 



Cymodocea aculeata, sj;. nov., Plate XVI., fig. 6. 



Body strongly convex, finely granular. First segment of the 

 thorax twice as broad as the rest. Last segment of the abdomen 

 with two prominent tubercles situated near the middle line, and 

 two smaller ones external to them. Terminal notch very deep, 

 quadrangular, the lateral processes triangular, central process 

 very prominent, projecting slightly beyond the extremity of the 

 lateral. Inner antennae with the basal joints very broad and 

 compressed, flagellum with twenty-two to twenty-five articuli. 

 Outer antennce rather longer than the superior pair ; flagellum 

 with about fourteen to sixteen articuli. Pami of caudal appendages 

 sub-equal, outer ramus sub-ovate, with the outer border straight, 

 the inner convex ; inner ramus oblong, emarginate. Length 

 9/16 inch. 



Hal. Port Jackson. 



Cymodocea mammifera, sp. nov., Plate XYIII., fig. 1. 



Surface nearly smooth. Frontal lobe very small. Lateral 

 angles of the thoracic segments rather blunt. Penultimate segment 

 of the abdomen with two very small rounded elevations near its 



