(c) STONE-LILIES.—Ex. Crinoidal or Entrochial limestone, Silurian, Toongabbie, Victoria ([Fig. 45]). Also the Carboniferous or Mountain limestone, Derbyshire, England.

(d) WORM-TUBES.--Ex. Serpulite limestone of Hanover, Germany. Ditrupa limestone of Torquay and Wormbete Creek, Victoria.

(e) POLYZOA.—-Ex. Polyzoal limestone, as the so-called Coralline Crag of Suffolk, England; and the Polyzoal Rock of Mount Gambier, S. Australia.

(f) BRACHIOPODA.—Ex. Brachiopod limestone of Silurian age, Dudley, England. Orthis limestone of Cambrian age, Dolodrook River, N. E. Gippsland.

(g) MOLLUSCA.—Ex. Shell limestone, as the Turritella bed of Table Cape, Tasmania, and of Camperdown, Victoria ([Fig. 46]), or the Purbeck Marble of Swanage, Dorset, England.

Fig. 46—Turritella Limestone.
(T. acricula, Tate); 3/4 nat. size. Cainozoic.
Lake Bullen Merri, near Camperdown, Victoria.		 Fig. 47—Limestone composed of the
Valves of an Ostracod (Cypridea).
Upper Jurassic. × 9.
Swanage, Dorset, England.

(h) OSTRACODA.—Ex. Cypridiferous limestone, formed of the minute valves of the bivalved ostracoda, as that of Durlston, Dorset, England ([Fig. 47]).

(i) CADDIS FLY LARVAE.—Ex. Indusial limestone, formed of tubular cases constructed by the larvae of the Caddis fly (Phryganea). Occurs at Durckheim, Rhine District, Germany.

(j) RED SEAWEEDS.—Ex. Nullipore limestone, formed by the stony thallus (frond) of the calcareous sea-weed Lithothamnion, as in the Leithakalk, a common building stone of Vienna.