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Fig. 1. 



Ilexactinella labyrinthica. Lateral surface of skeletal plate. Vertical beams in 



figure are radial to sponge surface; macerated 





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 11 



Plate 11. 



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preparation; x 70. 



Small scopula ; x 600. 



Discohexaster ; x 600. 



Dermal oxydiact; middle region and the two ends; 

 x 600. 



Dermal pentact (a), and aberrant proximal rays of 

 two other pentacts (6, c) ; x 170. 



Dermal membrane, showing pores and supporting 

 pentact rays ; x 100. 



Section, vertical to surface. Just beneath dermal 

 membrane are a large, and two small, afferent 

 canals. Shaded tissue densely filled with flag- 

 ellated chambers and small canals ; x 70. 



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