PLATE VII 



Figs. 1-9. Hippocrepinella hirudinea, Hemn-AWenandEarhnd (No. 82). Fig. i, abnormal 

 individual with bifurcate extremity: x 20. Fig. 2, thin section (transparent) 

 showing protoplasmic body loaded with diatoms: x 20. Fig. 3, opaque 

 section; the variations in the thickness of the wall of the test at different 

 places are due to the angle at which the section is cut : x 20. Fig. 4, oral-end 

 view: x 15. Figs. 5-9, side views illustrating variations in shape due to 

 compression, shrinkage, etc. Figs. 7-9 show accessory openings in the 

 walls, possibly due to parasites: x 20. 



Figs. 10-12. Hippocrepinella alba, Heron-Allen and Earland (No. 84): x 20. Side views 

 of specimens of various sizes. 



Figs. 13-15. Hippocrepinella hirudinea var. crassa, Heron-Allen and Earland (No. 83): 

 X 24. Figs. 13, 14, side views. Fig. 15, end-oral view. 



Figs. 16-23. Armorella sphaerica, Heron-Allen and Earland (No. 71). Figs. 16-20, 

 illustrating variations in size, number of tubes, etc.: x 35. Fig. 21, with 

 incorporated sponge spicule : x 25. Fig. 22, using sponge spicules and coarse 

 sand for construction : x 25. Fig. 23, using coarse material for construction : 

 X 25. 



Figs. 24-7. Pelosphaera cornuta, Heron-Allen and Earland (No. 59) : x 9. Fig. 24, young 

 individual. Figs. 25, 26, stages in development. Fig. 27, a specimen laid 

 open; the white lines between the sand grains indicate the highly finished 

 surface of the incorporating cement in the interior of the test, as compared 

 with the rough external layer. 



