AUSTRALIAN MALACOSTRACA. 295 



509. Oerceis trispinosa. A.M. 

 Cymodocea trispinosa, Haswell, 1. c, Vol. vi., p. 9, pi. iii., 



fig. 7. 



Surface nearly smooth. Greatest breadth nearly half the 

 length. First segment of the thorax scarcely so long as the 

 second and third together. Outer border of all the thoracic 

 segments ridged; epimeron of last segment produced backwards 

 into an uncinate process. First abdominal segment short, with 

 the divisional lines distinct ; its posterior border with a wide 

 shallow excavation bounded on either side by a rounded tooth 

 with an obscure denticle internal to it. Last abdominal segment 

 granular and hairy, with a low elevation about its middle. 

 Posterior notch deep, its angles produced and acute, a little more 

 prominent than the mesial lobe, which is conical and acute. 

 Outer ramus of uropoda longer than the inner, ovate-lanceolate, 

 acute, inner extending beyond the extremity of the abdomen, 

 acuminate. Colour uniform light red. Length to in. 



Griffiths' Point, Victoria. 



This species seems to be intermediate between Cymodocea and 

 Oerceis. In the form of the abdomen and caudal appendages it 

 agrees well with Milne- Edwards' description of G. tridentata, 

 but the head is certainly not "tres retreci en avant," and 

 Milne-Edwards' species does not appear to possess the curious 

 lateral processes on the last segment of the thorax. 



Genus Cilicoia, Leach. 



General form of the body as in Cymodocea. First segment of 

 the abdomen produced behind into a longer or shorter mesial 

 process. 



510. Oiliccea tenuioaudata. A.M. 

 Cilicoea tenuicaudata, Haswell, 1. c, Vol. v., p. 475, pi. xvii., 



fig. 2. 



Surface obscurely granular. Postero-lateral angles of the 

 segments of the thorax sub-acute. Penultimate abdominal 

 segment obscurely tubercular ; median spine very long, extending 

 far beyond the extremity of the abdomen, narrow, blade-like, 

 bifurcate at the tip. Last segment of the abdomen with two 

 rounded mammiform elevations ; a deep mesial excavation at its 



