RHABDOCALYPTUS MOLLIS. 263 



are somewhat less developed, with respect both to their size and 

 number, than in R. victor. They are directed obliquely outwards, 

 the stronger ones in the basal parts of the rays being curved 

 generally likewise outwards but occasionally in some other direc- 

 tion, in a claw-like manner. Though arranged as a rule in two 

 irregular series on the lateral sides, there may occasionally exist 

 a spine or spines on the external side of the ray, especially in 

 the basal parts. The spines on the two sides may alternate with 

 tolerable regularity, but this is subject to frequent interruptions. 

 Those on the same side are situated at intervals which frequently 

 may measure 160/^ or thereabout. 



In some cases — not all — of the spined hypodermal pentactins, 

 I have found the general surface of the paratangentials to be 

 finely shagreen-like on account of the presence of dense micro- 

 tubercles, similar to those in certain Staiirocalyptus species. In 

 this, as also in several other features of the spiculation, the 

 present species stands in very close agreement wàth R. avslralis 

 Tors. 



A number of slender diactins, indistinguishable from paren- 

 chymalia of a similar strength, associate with the paratangentials 

 in forming the hypodermal strands. A number of comitalia 

 accompany the shafts. 



The dermalia (PI. XX., fig. 12) are generally rough and 

 rod-like diactins, much like those given in PL XXL, fig. 2 (from 

 R. unguiciilatus) . Earely and exceptionally are they orthodiactins, 

 tauactins, stauractins or pentactins. According to F. E. Schulze 

 monactins should occasionally occur also. 



The diactins, which are either straight or very slightly 

 arched, are 265-485 /^ long as measured from tip to tip. Breadth 



