OF THE SPONGIAD^E. 239 



FIG. 



. ATTENUATO-CYLINDRICAL VERTICILLATELY SPINED. 

 See 210, 238, and 239. And Plate X, same num- 

 bers. 



69. VERTICILLATELY SPINED CYLINDRICAL. X 660 linear. 

 From an undescribed sponge from Freemantle, 

 Western Australia. Very abundant on the dermal 

 and interstitial membranes. Internally and exter- 

 nally defensive. 



70. SUB-ATTENUATO-ENTIRELY SPINED CYLINDRICAL. X 



400 linear. From Hymeniacidon Cliftoni, Bower- 

 bank, MS., Freemantle, Western Australia. In- 

 ternal defensive. 



71. MULTIANGULATED CYLINDRICAL. X 400 linear. 



From a sponge in the British Museum ; accident- 

 ally entangled in its tissues. The same form occurs 

 in the interstitial membranes of Geodia carinata, 

 Bowerbank, MS., figured in Plate xxxvi, F'ig. 42, 

 ' Phil. Trans.,' 1858, page 314. 



72. SPINULO-MULTIANGULATED CYLINDRICAL. X 660. 



Found among the extraneous spicula of the same 

 sponge that produced the one represented by Fig. 

 71. It is in the Johnstonian collection in the 

 British Museum. It is designated Halichondria 

 sanguince, and its register is 47. 9. 7.19. 



73. SPINULO-RECURVO-QUATERNATE. X 130 linear. 



Representing its first stage of development. Page 

 34. 



74. The same form of spiculum as represented by Fig. 73, 



in its second stage of development. X 130 linear. 



75. The same form of spiculum as represented by Fig. 



73, in its third stage of development. X 130 

 linear. 



76. The same form of spiculum as represented by Fig. 73, 



in a completely developed state. X 130 linear. 

 From an undescribed species of sponge. Locality 

 unknown. Internally defensive. See Plate XVIII, 

 Fig. 292. The gradual development of this form of 

 spiculum is very instructive. Pages 32, 33, and 34. 



