PLATE XXIV. 
Fig: 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. G. 
Fig. 7. 
Fig. 8. 
Fig. 8a. 
Fig 9. 
Tryplasma liliiformis, Eth.Jil. 
Portion of a corallite in longitudinal section, prepared for the microscope, exhibiting a 
portion of the calice and tabulae below. — x 2. 
Tryplasma columnaris, Eth.Jil. 
Longitudinal section of portion of a corallite, prepared for the microscope, displaying 
the thick solid walls, septal spines, complete and incomplete tabulae and spines 
thereon. — x 2. 
Similar transverse section, exhibiting the cut edges of vesicular tabulae, and the cut ends 
of the vertical spines. — x 2. 
A few of the cut ends (Fig. 3) of the tabular spines more highly magnified. 
Another transverse section of a corallite prepared for the microscope. Here the. wall is 
very much thickened, and the primary septal spines greatly elongated ; the vertical 
spines are again visible. — x 2. 
Tryplasma dendroidea, Eth.Jll. 
Longitudinal section of a small portion of a corallite, prepared for the microscope, 
exhibiting characteristic tabular — x 2. 
Tryplasma Lonsdalei, var. scalariformis, Eth.Jil. 
Transverse sections of two corallites, prepared for the microscope ; the upper shows a 
rare feature in this species — the cut edge of an incomplete tabulum. — x 2. 
Similar longitudinal section, exhibiting the regular step-like tabulae. — x 2. 
Transverse section of a corallite, displaying the parent corallite and three rejuvenescent 
buds. — x 2. 
Tryplasma Lonsdalei, var. minor, Eth.Jil. 
Longitudinal section of portions of two corallites, prepared for the microscope, showing 
septal spines and tabuhe. — x 2. 
