TAB. IV. 

 CORALS FROM THE LONDON CLAY. 



Paracyathus crassus (p. 23). 



Fig. 1 . Two adult corals and a young one, cemented together by their basis ; 

 natural size. 

 1 a. A young specimen, with its basis spreading very much, viewed from above. 

 1 b. A young specimen, magnified to show the structure of the costae. 



1 c. Calice, magnified ; — 1 / 1, 1, 1, 1 / 1, Septa of the first cyclum. 



Paracyathus caryophylltjs (p. 24). 



Fig. 2. An adult specimen, complete ; natural size. 



2 a, 2 b, 2 c. Worn specimens ; natural size. 



2 d. Two young individuals cemented by their basis. 



2 e. A remarkably short specimen. 



2 /. A complete specimen, magnified so as to show the structure of the wall. 

 2y. Calice, magnified. 



Paracyathus brevis (p. 25). 



Fig. 3. A specimen, the base of which is somewhat worn down; natural size. 



3 a. The same, magnified. 

 3 b. Calice, magnified. 



3 c. Interior cast of a corallum, which is taller than the preceding one, but appears 



to belong to the same species. 



Dasmia Sowerbyi (p. 25). 



Fig. 4. Side view of the corallum ; natural size. 



4 a. The same magnified, so as to show the structure of the costse. 



4 b. Calice, magnified ; the central part is filled up with extraneous matter. 



