size. 



EXPLANATION OF PLATE XVI. 



Aphrocallistes hocagei. Percival Wright, 

 Fig. 1. A colony of several calyces joined by narrow radial tubes. Nat. 



Fig. 2. A macerated, slightly injured dictyonal skeleton of a calyx with 

 narrow radial tubes. Nat. size. After a photograph taken by Dr. von Mahren- 

 thal. 



Fig. 3. A macerated, slightly injured dictyonal skeleton of a calyx with 

 wide radial tubes, seen from above. Nat. size. After a photograph taken by 

 Dr. von Miihrenthal. 



Fio-. 4. Scopule with four abruptly bent, strongly divei'ging dermal 

 branches which bear terminal discs. x 450. 



Fig. 5. Scopule with four straight and parallel, rhabdose dermal branches. 

 X 450. 



Fig. 6. Regular parenchymal oxyhexaster. x 450. 



Fig. 7. Parenchymal hemioxyhexaster with somewhat elongated main 

 axis. X 450. 



Fig. 8. Parenchymal hemioxyhexaster, one of the differentiated main- 

 rays of which is considerably elongated. x 450. 



Fig. 0. Regular parenchymal onychaster. x 450. 



I^'ig. 10. Parenchymal onychaster with one elongated main-)'ay. x 450. 



Kig. 11. Hemioxyhexaster with three long and branched and three short 

 and unbranched main-rays. x 450. 



