Plate VIII. 



Page 

 Fig. I. Pachychalina Schniidtii xi.f<^. Oxea, a fully developed, b developmental forms, 



X 255 5 



— 2. Pachyckahna SclimMtii n. sp. Longitudinal section of the skeleton towards the 



surface, but not reaching it, x ca. 20. a inward, b outward — 



— 3. Pachychalina Schinidtii n. sp. A piece of the skeleton, x 60 — 



— 4. Pachychalina caitlifera Vosm. Oxea, a fully developed, b developmental forms, 



X 255 7 



— 5. Pachychalina caitlifera Vosm. Longitudinal section of the skeleton towards 



the surface, x ca. 20. a inward, b outward — 



— 6. Pachychalina canli/era Vosm. A piece of the skeleton, x ca. 100; as it is near 



the surface the longitudinal fibres are running almost horizontally — 



— 7. Chalina oculata Pall. Oxea. x 255 10 



— 8. Chalina spatula n. sp. Oxea, a fully developed, b developmental forms, x 255. 11 



— 9. Chalina spatula n. sp. Section of the skeleton at the edge, x ca. 14. A few of 



the pohspicular fibres are seen — 



— 10. Siphoiiochalina pnlcherrinia Frstdt. Oxea, a fully developed, b developmental 



forms, X 255 13 



— II. Siphonochalina pulchernina Frstdt. Longitudinal section of the skeleton from 



the surface some way inward, x ca. 20. A few polyspicular fibres are seen. 



a inward, b outward — 



— 12. Siphonochalina n/ollicula n. sp. Oxea, a full)' developed, /; developmental form, 



X 255 15 



— 13. Siphonochalina niolliciila n. sp. Longitudinal section of the skeleton from the 



surface some way inward, x ca. 20. a inward, b outward — 



— 14. Siphonochalina uiollicula n. sp. Piece of the skeleton, x ca. 100 — 



