22 

 PLATE 6. Polycystince. 



FIG. l. Epiihemia (Rupestris (?) ) Arctuate slightly ; striae very distinct ; 



eleven bands, pink hue. 



FIG. 2. Vorticella. Hyaline texture ; greenish colour. 



FIGS, l to 13. These minute silicious skeletons, of various forms and structures, 

 abounding where those of the Foraminiferae and Diatomacese are usually 

 found, but in almost every instance, from their very delicate nature, 

 are fractured, are here pictured to shew their beauty and variety of 

 pattern, which are for the most part of a glassy transparency, except 

 in a few cases where they have become irregularly coated with car- 

 bonate of lime. 



Many delicate glassy frameworks of fantastic and beautiful shapes 

 were always mixed with the material, and in various hexagonal, sexa- 

 gonal, and spherical forms. 



These few sketches will shew the beautiful and fanciful arrangements 

 of the Polycystina, among which are most conspicuous : 



Radiolaria, 

 Podocy^tis Mitra, 

 Eucyrtidium Elegans, 

 Astromma, 

 Lychnocanium Falciferum, 



Ditto Lucerna, 

 Eucyrtidium Tubulus, 

 Rhabdolithus Sceptrum, 

 Haliomma. 



FIG. 11. Fragment of Dentalina (sub.) Two segments ; costate ; curves shell 



shaped; opaque. 



