PLATE XXXIV. 



PAGE 



Figs. 1-11. Hyalo'iiema (Stylocalyx) thomsoni, W. Marshall, . 211 



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



Fig. 2. Great amphidisc with four cruciately disposed central knobs ; x 300. 



Fig. 3. Middle-sized amphidisc with a central thickening of the axial beam ; 

 x300. 



Fig. 4. Oxyhexact with straight rough rays ; x 300. 



Fig. 5. Small amphidisc ; x 300. 



Fig. 6. Autodermal pentact pinulus ; x 300. 



Fig. 7. Undeveloped great amphidisc ; x 300. 



Fig. 8, Middle-sized amphidisc ; x 300. 



Fig. 9. Inferior part of an anchor-like spicule of the basal tuft ; x 100. 



Fig. 10. Strong hexact from the basal pad, with echinated ends ; x 300. 



Fig. 11. Strong tetract from the basal pad, with rough rays and echinated ends ; 

 X 300. 



Figs. 12-17. Hyalonema (Stylocalyx) thomsoni, var. exigua, . 214 



Figs. 12-14. Amphidiscs of various sizes ; x 300. 



Fig. 15. Tetract with echinated ends, from the basal pad ; x 300. 



Fig. 16. Inferior part of an anchor-like spicule of the basal tuft ; x 100. 



Fig. 17. Strong tetract with rough rays and echinated ends from the basal pad; 

 x300. 



