19 EXPLANATION OF PLATE* 



11 ( J. — Istbmia minima, Bailey & Harvey. 



'• 10. — Brightwellia Jobnsoni, Ralfs. 



;; 11.— Coscinodiscus Excavatus, Var. 4-ocellata, Grun, 



" 12.— do do Var. Biocellata, Grun. 



" 13. — Rylandsia biradiata, Grev. 



" 14.— Cestodisous superbus, Hardmau. 



11 16. — do do. 



