PLATE XXX. 



PAGE 



Figs. 1-8. Hyalonema tenue, F. E. S., . . . 228 



Fig. 1. Fragment, sliowing the margin of the oscular aperture, outer side view ; 

 natural size. 



Fig. 2. Fragment of the side wall, interior (gastral) side view ; natural size. 



Fig. 3. Autodermal pentact pinulus ; x 100. 



Fig. 4. Amphidisc ; x 300. 



Fig. 5. Oxyhexact with smooth bent rays ; x 300. 



Fig. 6. Amphidisc; x 300. 



Fig. 7. Marginal diact with four cruciately disposed central knol)S ; x 100. 



Fig. 8. Oxyhexact with straight smooth rays ; x 300. 



Figs. 9-17. Hyalonema kentii, 0. Schmidt, . . 207 



Fig. 9. Dried specimen without basal tuft, from a photograph ; natural size. 

 Fig. 10. Great amphidisc from the dermal membrane ; x 100. 

 Figs. 11-13. Amphidiscs of various sizes ; x 300. 

 Fig. 14. Oxyhexact with smooth bent rays ; x 300. 

 Fig. 15. Oxyhexact with smooth straight rays ; x 300. 

 Fig. IG. Autodermal pentact pinulus of the lateral side ; x 100. 

 Fig. 17. Autodermal pentact pinulus of the sieve plate ; x 100. 



