184 ON SOME NEW AUSTRALIAN MARINE ISOPODA, 



directed upwards, forwards, and outwards near the posterior 

 margin. First segment of the thorax with a similar pair of 

 bifurcate horns, its lateral border prominent, tridentate ; following 

 segments short, each with a single transverse row of slender 

 spines, the lateral angles very acute — that of the fifth segment 

 bifurcate. First abdominal segment with two prominent spines 

 on its proximal dilated portion — the posterior process extending 

 nearly as far as the extremity of the abdomen, forked at the tip. 

 Last segment with two rounded elevations, each armed with 

 several spines, with a deep, rounded terminal notch, immediately 

 above which is a a prominent spine. Eyes large and prominent ; 

 antennce subequal, nearly one-third of the length of the body. 

 Mobile ramus of uropoda bifurcate, the outer branch short, tooth- 

 like, the inner long, slender, spinif orm ; immobile ramus broad 

 proximally, but slender and spinif orm distallj , its outer border 

 armed with two acute teeth, its inner with one. Length £ in. 



Sab. Port Stephens — five fathoms (Australian Museum). 



2. Cilicrea spinulosa, sp. nov., Plate III., fig. 3. 



Head large and dilated, covered with rounded and pointed 

 tubercles. Pirst segment of the thorax much broader than the 

 rest, armed with a number of short blunt spinules, and with a 

 prominent bifid tubercle on either side ; its lateral process 

 obscurely bilobed. Following segments each armed with a row 

 of short spinules which are more numerous and smaller on the last 

 three segments ; epimeral processes prominent, subacute, except 

 that of the fifth, which is emarginate. First segment of the 

 abdomen ornamented at the base with a double transverse row of 

 tubercles ; posterior process finely granular, sub-cylindrical, 

 slightly enlarged or bifid at the apex, extending far beyond the 

 extremity of the abdomen, but not so far as the extremity of the 

 uropoda. Terminal segment having its lateral dilatation armed 

 with two short thick spinules ; terminal notch deep. Antennae 

 sub-equal, about one-third of the length of the body. Uropoda 



