152 " THETIS " SCIENTIFIC RESULTS. 



PILUMNUS AUSTRALIS, sp. nov. 



(Plate XXXV., figs. 1-4.) 



Stations 44, 49. 



Carapace slightly convex, a little longer than broad, clothed 

 as well as the limbs with fine short hairs and numerous stiff, 

 elongate, yellow sette ; the latter arise from small pits with 

 elevated margins, which render the surface very uneven, otherwise 

 the surface is smooth and glossy. 



Front prominent, with about ten denticles ; lobes rounded, 

 separated by a shallow V-shaped notch ; each lobe is bounded 

 laterally by a small sinus, and a cylindrical spine is present 

 immediately above the subfrontal process. 



Upper orbital border smooth, nearly entire, with onl}^ the faintest 

 trace of a sinus ; inner and outer angles of orbit without spines or 

 granules externally at the junction of the upper and lower borders;, 

 the margin is thin, elevated, and exhibits a very shallow angular 

 sinus. 



Lower border of the orbit minutely denticulate externally, and 

 a moderately large spine on the inner angle ; the spine has a broad 

 base and tapers to an acute apex ; subocular, subhepatic, antero- 

 lateral, branchial, upper and inner pterygostomial regions more 

 or less granulose, a few of which are subspiniform. 



Anterior lateral border armed with three elongate and equi- 

 distant spines ; the second is a little longer than the first and 

 much longer than the third ; the first spine is slightly curved and 

 directed forwards ; each spine bears two or more stiff set^e ; they 

 arise at about one-third from the base and continue parallel with 

 the spine, and frequently exceed the latter in height. 



Chelipedes unequal, the right or the left the larger. Anterior 

 edge of ischium joint denticulate Merus as broad distally as 

 long ; inner surface smooth and shining ; outer and inferior 

 surfaces minutely granulose ; anterior border acute, with two 

 unequal spinules proximally ; lower border rounded, granulose, 

 the granules becoming larger distally ; superior border acute, with 

 four spinules, two small about the middle, and two large — one 

 distal and the other posterior to a shallow transverse groove. 



Carpus as broad as long, equal to the merus in length ; inner 

 surface granulose ; mai'gin angular, tipped with a spine ; upper 

 and external surfaces armed with about fifteen acute spines, sub- 

 equal in size and in distance apart ; numerous stiff sette occur at 

 the bases and between the spines, the rest of the surface is 

 smooth. 



