PLATE XXXVIIT. 



PAGE 



Hyalonema {Stylocalyx) apcrtum, F. E. S., . . 214 



Fig. 1. Vertical section through the upper marginal portion (combination figure) ; 

 x20. 



Fig. 2. External view of the dermal membrane ; x 60. 



Fig. 3. Oxydiact from the parenchyma ; x 100. 



Fig. 4. Small strong oxyhexact with straight echinated rays ; x 300. 



Fig. 5. Oxyhexact with bent barbed rays x 300. 



Fig. 6. Middle-sized amphidisc ; x 300. 



Fig. 7. Great amphidisc with nodose axial beam ; x 100. 



Figs. 8, 9, Small amphidiscs ; x 300. 



Fig. 10. Autodermal pentact pinulus ; x 300. 



Fig. 11. Marginal oxydiact with four cruciately disposed central knobs ; x 300. 



Fig. 12. Gastral pentact pinulus ; x 300. 



