80 A RE-KXAMINATION OF AUSTRALIAN PYCNOGONIDA, 



sence of this long cylindrical tubercle no doubt has sug-- 

 gested the name of the species. At the apex of this column 

 are four distinct eyes. 



Abdomen and chelifori are as described by Haswell. 



Palps absent. 



Ovigers absent in the female. In the male each oviger 

 is six-jointed, and the joints have the proportions stated 

 by Haswell. The third joint, however, has a slight con- 

 striction at ebout one-fifth the length of the joint froon the 

 proximal end. A few simple spines occur on the last few 

 joints. Noteworthy is the presence of a peculiar bent spine 

 on the ventral side of the penultimate joint about one- 

 third the distance from the proximal end. 



Legs. — These are as described by Haswell. The only 

 alteration I have to suggest is that the particular spine of 

 the second tibia is situated on a tubercle some little dis- 

 tance from the distal end. 



Nervous system. — The nervous system of the species is 

 well shown in some of the slides fro^m the Sydney Univer- 

 sity Collection, and it is of interest to point out that the 

 arrangement of this system varies a little from that indi- 

 cated by Loman (1917, p. 83). He figures Anoplodactylus 

 with but four ganglia, whereas most other pycnogonida 

 have five, and suggests that owing to the reduction or dis- 

 appearance of the ovigers and the absence of palpst the an- 

 terior ganglion which innervates these two organs has 

 fused with the succeeding ganglia. In the species under 

 discussion, nowever, the anterior ganglion, although small, 

 ia present, but is in contact with the next succeeding gang- 

 lion. 



Genital openings. — Male openings occur on sm>all 

 ■ tubercles at distal end of second' coxae of the two posterior 

 pairs of legs. Female openings on all the pairs of legs. 



Measurements, holotype, male. 



mm. 



Proboscis, length 1.36 



greatest diameter 38 



Trunk, length 1.90 



width across first pair of crurigers... 1.56 



,, behind ,, ,, ,, ,, 30 



,, behind second ,, ,, 30 



third ,, „ 19 



Abdomen, len^feli ;.'?. 74 



width near base 13 



Neck, width 12 



