PLATE 17. 



Fig. 1. 101. 2. ClI^TETES LYCOPERUON. ( F'a"-. 40.) 



1 a. The uppc^i- surface of a flat massive form. 

 1 b. Figuie showing tlie heigtit of the same specimen. 

 1 c. Tlie lower surface of the same specimen. 

 1 d. Section of a small hemispheric mass. 

 1 e. Several columns enlarged. 

 1 /. Openings of cells enlarged. 

 1 g. A ramose specimen on limestone. 



1 h, i, k. Sections of the branches of several ramose specimens through the centre, and on one side of the 

 centre, showing the arrangement of the cells. 



1 /. Several of the cells enlarged. 



Fig. 2. 418. 2. Favistella favosidea- (Pag. 41.) 



2 a. A fragment of a large mass : cells natural size. 



2 b. Three of the cells enlarged, showing the double walls which coalesce at intervals. 



2 c. A small spheroidal mass of the same species. 



2 d. A section of a spherical mass of this species, showing the radiating cells. 



2 fi. A small fragment showing the raj's within the cells. « 



2 /. Several of these cells enlarged, .showing the rays, etc. 



Fig. 3. 419. 1. Caninia bilateralis. (Pag. 41.) 



3 o. Posterior view, showing the shorter posterior side and oblique cui>, which has aboiit 48 rays. 



3 b. Anterior side of another specimen, showing the mode of increase bv tiie addition of new rays or lamelLT. 



3 c. An enlarged view of the cup of another specimen. 



3 d. A longitudinal section, showing the internal characters. 



3 e. A young specimen, lateral view. 



3 /. Enlarged view of the cup, showing the irregular union of the lamella? in the centre, 



3 g. A large individual -. view a little on one side of the anterior face. Rays .50 or more. 



3 h. An irregular form, apparently of this spiecies. 



Fig. 4. 420. 1. Cyclolites ROTULOiDEs. (Pag. 42.) 



4 a, b. The upper surface of two individ\ials of different size. 4 c. Lateral view of the same. 

 4 d. Base of another individual. 4 e. Several rays enlarged. 



