92 TWO NEW AUSTKALIAN PYCNOGONIDA, 



(2) Pycnogonum aurilineatum, &Tp. nov. 

 Plate XIII., figs. 1-2; plate XIV., fig. 3. 



Description. — ^Coloiir, dark brown with a longitudinal 

 niid-dorsial band of yellow, two thirds of a millimetre 

 wide, extending from behind the ocular tuberclei toi the 

 posterior edge of the penultimate trunk segment, also 

 with various flecks aud spots of yellow on the body and 

 limbsi. The distal third or so of the pi-opoclusi of each 

 leg is also of the Siame colour. 



The species belong to the group which have a "sha- 

 greened' appearance (Bouvier, '''). Here and there only— 

 for example, on the proboscis — ^does any of the reticulation 

 found in some other forms of the genus appear. 



Body is extremely sto'ut, strong and broad ; the seg- 

 ments are strongly marked dorsally and ventrally. Dor- 

 sally each segment of the trunk except t.he last culminates 

 in an obtusely rounded median projection, placed at the 

 hinder border of the segment. In this, P. aurilineatum 

 resembles P. gaini, Bouvier (8, 9), but in the latter there 

 are four such elevations, each less rounded than in P- 

 aurilineatum. The median tubercle found in the last seg- 

 ment of the trunk of P. gaini is absent in the species 

 now under discussion. In Plate XIII., fig. 2, showing a 

 side view of P. aurilineattun, the elevation behind the 

 third trunk eminence, and which appears at first sight 

 to correspond with the most posterior trunk eminence 

 of P. gaini, belongs really to the fourth cruriger of the 

 right side. 



The cej)haJon has its anterior border almost entirely 

 undeveloped, the comparative smallnesSi of this portion 

 being remarkable when compared with the similar regioai in 

 a form like P. littorale (Strom). The first pair of crurigers 

 is almost entirely fused with the lateral borders of the 

 cephalon, practically the whole of the an tero -internal edge 

 of eaich cf these crurigersi being included. 



Each segment of the trunk except the last ends poster- 

 iorly in a high and prominent round edge. The last 

 trunk segment is peculiar.^ Instead of being a broad band 

 like the other segments, it is practically only the meeting 

 place of the posterior j)air of crurigers. 



The crurigers are broad and stout. The antierior 

 pair are almost entirely fused with the cephalon. The 

 crurigers are separated by well defined intervals, that 

 between the third and fourth pairs being the greatest. 

 At the distal end of the second, third, and fourth 

 crurigers, small elevations occur. These are largest in 



