EXPLANATION OF THE PLATES. 



Fig. 7. External view of the anterior part of the right side of the lower jaw of the 

 same. 



Fig. 10, Lower extremity of the left humerus of the same. 



Fig. 8. Humeral extremity of the left radius of a small species of ruminant. 



Fig. 11. The first phalangal bone of the right hind leg of a small ruminant. 



Fig. 12. Lower extremity of the right tibia of the same. 



Fig. 6. Molar tooth of a carnivorous animal of the genus Viverra. 



Fig. 9. The upper articulation of the right radius of a small species of herbivorous 

 animal referable to the Pachyderraata. 



Figures 14 to 17 illustrate Mr. Stokes's notice on Echini, which will be found in the 

 Extracts from the Minute-book at the end of the volume. 



Figs. 14 & 15. Two views of Galerites albo-galerus from the chalk. In fig. 14 the 

 plates of the mouth, consisting of five pairs, are presented in situ. 



Fig. 16. A cidaris, also from the chalk, in which portions of the plates of the mouth 

 and teeth are visible. They are mostly displaced, but are analogous to those 

 found in recent species of this genus. 



Fig, 17. A cidaris from Stonesfield, in which the anal plates are well shown. 



PLATES XLVL XLVIL XLVIIL XLIX. 



Illustrate Professor Buckland's paper on the Cycadeoideae, a family of fossil plants 

 found in the oolitic series of the Isle of Portland. 



Plate XLVL 



Fig. 1. Section near the base of a Cycas revoluta, in the possession of Mr. R. Brown, 

 from a plant that died at Kew. The thinness of the outer case, composed of the 

 bases of leaves, arises from its proximity to the x'oot. The body of the trunk is a 

 mass of spongy pith-like cellular tissue, in which are imbedded two laminated 

 circles of unequal width near the centre : in the cellular tissue is much farinaceous 

 matter. 



Fig. 2. Section of Cycas circinalis or Todda Panna, copied from PI. XXI. vol. iii. of 

 Rheede's Hortus Malabaricus. This stem, like fig. 1, is composed of a pith-like 



