PLATE XXXI. 



PAGE 



Figs. 1-7. Hyalonema (Stylocalyx) elegans, F. E. S., . . 223 



Fig. 1. A somewhat damaged specimen, preserved in alcohol ; natural size. 



Fig. 2. Fragment of the outer part, outer side view ; x 60. 



Fig. 3. Diact with two central knobs and echinated ends ; x 100. 



Fig. 4. Autodermal pentact pinulus ; x 200. 



Fig. 5. Small amphidisc ; x 500. 



Fig. 6. Middle-sized amphidisc with echinated axial beam ; x 200. 



Fig. 7. Small amphidisc with nodular axial beam ; x 500. 



Figs. 8-20. Hyalonema (Stylocalyx) tenerum, F. E. S., . . 224 



Fig. 8. A damaged specimen, preserved in alcohol ; natural size. 



Fig. 9. Oxyhexact with smooth bent rays ; x 300. 



Fig. 10. Monact with one thickened echinated end; x 100. 



Fig. 11. Autodermal pentact pinulus ; x 200. 



Fig. 12. Great globular amphidisc with ten rays ; x 200. 



Fig. 13. Great globular amphidisc, not yet full developed ; x 200. 



Fig. 14. Middle-sized amphidisc, terminally truncated, with straight rays ; x 200. 



Fig. 15. Tetract with echinated ends from the basal pad of the body; x 100. 



Fig. 16. Small amphidisc ; x 500. 



Fig. 17. Oxyhexact with smooth bent rays ; x 500. 



Fig. 18. Abnormally large globular " amphidisc" with four rays ; x 200. 



Fig. 19. Fragment of the outer portion, outer side view ; x 60. 



Fig. 20. Great amphidisc ; x 200. 



In the Plate the designation of figs. 8-20, Hyalonema (Stylocalyx) tenerum, F. E. S., 

 has been accidentally omitted. This plate was arranged by Sir Wyville Thomson. 



