SPONGES. -KALLMANN. 



201 



densely packed that the fibre 

 l)ecomes practically a lused 

 mass of acanthostyles. The 

 acanthostyles are stout in pro- 

 portion to their length and are 

 furnished with large and 

 numerous spines. The prin- 

 cipal and auxiliary styli are de- 

 void of any basal enlargement 

 or reduction ; the latter are oc- 

 casionally, the dermal stvli 

 usually, basally spined. The 

 greatest dimensions of the spi- 

 cules are : — 



Megasclcrcs. — 



(i.) Principal styli, 240 x 

 12 }i. 



(ii.) Accessory styli, 300- 

 330 xg ft. 



(iii. ) Dermal styli, usually 

 less than 130 x 4.5 ^. 



(iv.) Acanthostyles, 50-68 

 ti long, and up to 8.5 

 }i in diameter. 



Microscleres. — 



(1.) Larger chelae, 15-^0 11 

 long. 



(ii.) Contort chelae, attain- 

 ing to 1 1 }i in length. 



(iii. ) T o X a : observed 

 lengths, 55-260 ji. 



Loc. — Bass Strait, East 

 Coast of Flinders Island. 

 ("Endeavour. ") 



Rhaphidophi.us TVPicrs, var. 



FAVOSus, Whitelegge. 



(Text-fig. 42.) 



This variety, which is so far 

 Icnown only from a few frag- 

 mentary specimens, is well dis- 

 tinguished from the others by 

 (i.) its long slender cylindrical 

 branches which do not exceed 



Fig. 42 — R. typicus var. tavo- 

 sus. a Principal styli. b Aux- 

 iliary styli. c Special dermal 

 styli. d Acanthostyli. e Chelae. 



