100 
Plate I 2 
Sireptelasma fragile n. sp. 
Figure 1 . Looking into the base of a broken cup, showing the septal arrangement. X 2. (Page 11.) 
Figure 2. Section of interior showing the proportion of the cup. (Page 11.) 
Streptelasma prolongation n. sp. 
OSee also Plate II, figure 2) 
Figure 3. Top of an average-sized specimen, showing the septal arrangement well developed. 
(Page 11.) 
Figure 4. Outline of a large specimen, showing the prolonged pseudo-fossula. (Page 11.) 
Figure 5. Base of the cup of another specimen showing the peculiar network formed by the irre- 
gular plate-like standards on the septa at the centre. The sides of the cups are broken un- 
evenly. (Page 11.) 
Streptelasma distinctum n. sp. 
Figure 6. Interior showing shortened diameter along the cardinal septum, and arrangement of 
the septa in the quadrants. (Page 12.) 
Figure 7. Bottom of the cup showing the comparatively small part occupied by the cellulose 
structure. The edge of the cup is broken unevenly. (Page 12.) 
Haly sites robustus n. sp. 
Figure 8. Top of large colony, showing some of the long, narrow reticulations. (Page 14.) 
Figure 9. Cross-section showing the thickened end walls outlining the oval interior and oblong 
exterior of the corail ites. (Page 14.) 
Figure 10. Longitudinal section, showing the rather thick and relatively not very numerous 
tabulae . The three corallites on the right are at an angle and are somewhat foreshortened. 
(Page 14.) 
Plasmadictyon irregulars gen. nov. 
Figure 11. View from the top showing the network of the irregular corallites. X 2. (Page 19.) 
Figure 12. Corallite showing the large pores. X 4. (Page 19.) 
1 Unless otherwise stated all figures are natural size. 
