Aptychus sublævis, [492].

Arabia, [362].

, foraminifera-rocks in, [362].

Arachnida, [550].

Araucaria peregrina, [175].

Araucarites, [168].

Arborescent ferns, fossil stems of, [122].

Archæocidaridæ, [322].

Archæoniscus Brodiei, [521].