EXPLANATION OF PLATE VIII. 
Fig. 1. Trochus (Scalaitrochus) lindstromi, Etk. fil. Side view of a some- 
what damaged specimen. 
,, 2. The same. Ventral view. 
„ 3. Niso, sp. Cross section of an example from the Tertiary beds of 
Muddy Creek, Victoria — x 7. 
„ 4. Niso (Vetotuba) bmzieri , Eth. fil. Cross section. 
„ 5. The same apex downwards, and partly in section. 
„ 6. Favosites grandipora, Eth. fil. Four corallites in section, showing 
the single row of large pores in one of the walls of each — x 5. 
„ 7. The same. Horizontal section, showing forms of the calices, 
remains of the proper wall, and secondary thickening — x 5. 
„ 8. The same. Portion of the natural surface of a corallum — x 6. 
„ 9. The same. Horizontal section of un thickened tubes — x 6. 
