148 OKHAMANDAL MARINE ZOOLOGY REPORT 



EXPLANATION OF TEXT FIGURES ON PRECEDING PAGE. 



Fig. 1. Group of digitate papillae, as seen under a hand lens. 



The walls of the papillae are extremely delicate and perfectly transparent, 

 and are not visible to tlie naked eye, which sees only the branching strands of 

 brown algse. To the unaided vision a group of these papillae appears as a much 

 branched, brown arborescent tuft (Fig. la). 



Fig. 2. Distal portion of a papilla more highly magnified, showing gland-like 

 liodies and a branching algal strand. 



The fine lines would appear to represent muscular fibres penetrating the 

 papilla. 



Fig. 3. A double row of algal cells from a papilla yellowish-brown in life. 



Fig. 4.. Colourless cells with clear refractive granules within. 



Fig. 4a. A group of the same found associated with the algal threads. 



Figs. 5 and 5a. Groups of cells from grey patches on the surface of the 

 main mass of the organism. Under the microscope this grey matter is seen to 

 consist of irregularly shaped cells, not unlike squamous epithelium — contents granular 

 and apparently colourless. A clear nucleus in each. 



Fig. 6. Two isolated cells of same, showing characteristic elongated form. 



Fig. 7. Two irregularly stellate cells from slightly yellowish tissue from a 

 little way below the surface ; the granular contents and clear nuclear centres are 

 similar in appearance to those of cells from the grey surface tissue 



Fig. 8. Strings of very minute cells, dark brown in colour, with a tinge of 

 red. Found mostly in the surface layer of the mass. 



Fig. 9. Irregular mass of the same cells as depicted in Fig. 8. 



Figs. 2 — 9 drawn under ^ in. Beck obj. 



KIOHARD CLAY AND SONS, LIMITEP, BREAD STREET HILL, E.O., AND BUNSAY, SUFFOLK. 



