PLATE XXV. 
Illustrates various phases assumed by glauconite in existing oceans. 
Fig. 1. Glauconitic casts and particles from off the coast of Australia, as seen between crossed nicols, showing 
aggregate polarisation. Little green and blue points form a very fine mosaic on a brownish-coloured 
ground. Station 164n; 410 fathoms. South Pacific (magnified 50 diameters). 
Fig. 2. Glauconite-like particle of a brown-green colour. The mammillated surface is quite like a typical 
glauconitic grain, but this particular grain appears to be an altered rock fragment. 
Fig. 3. Particle of a lighter colour than the preceding, but having apparently a similar origin. 
Fig. 4. Specimen of Glohigeriiia hulloides filled with a glauconitic cast. 
Fig. 5. Specimen of Truncatidina refulgens filled with glauconitic cast. 
Fig. G. Specimen of Miliolina seminulum filled with cast. 
Fig. 7. Specimen of Uvigerina pygmsea filled with cast. 
Figs. 8 and 9. Casts of OrhUina universa. 
Fig. 10. Cast of Anomalina coroncUa. 
Fig. 1 1 . Cast probably formed in the interior of Orhulina universa. 
Fig. 12. Specimen of Glohigerina packyderma filled with cast. 
Fig. 13. Cast of Polystomella arctica. 
Fig. 14. Cast of Anomodina coronata. 
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