404 REPORT — 1856. 



remainder will appear in due course in the future volumes of that series ; an 

 analysis of the Table shows that the species are thus distributed : — 



{Lower 6 species. 

 Middle 17 

 Upper 9 



Inferior Oolite 43 



Fuller's Earth 



Stonesfield Slate 6 



Great Oolite 26 



Bradford Clay 9 



Forest Marble 5 



Cornbrash 17 



Oxford Clay and Kelloway . . 



L'ower Calcareous Grit ... 9 



Coral Rag 20 



Upper Calcareous Grit ? 



Kimmeridge Clay 4 



Portland Sand 1 



Marine Purbecks 1 



The Lias species appear to be special to the three subdivisions of that for- 

 mation, so well characterized by the species of Ammonites which indicate these 

 three zones of Liassic life. The Inferior Oolite contains forty-three spe- 

 cies, of which forty are Echinoidea, one Asteroidea, and two are Cri- 

 NOiDEA ; of these, ten species extend into the Great Oolite, and seven species 

 pass into the Cornbrash; the Inferior Oolite has therefore twenty-six species 

 which up to this time have not been found in any other formation, and all the 

 species from the Lias to the Cornbrash included became extinct before the 

 deposition of the Kelloway rock and Oxford clay. The Fuller's earth has 

 yielded no remains of Echinoderms ; the Stonesfield slate contains six species, 

 most of which are special to this fissile oolitic rock. The Great Oolite has 

 yielded twenty- six species, of which nine extend into the Cornbrash, but seven- 

 teen are special to the Great Oolite stage. The eight species of the Bradford 

 clay are mostly common to this argillaceous bed, and the Great Oolite lime- 

 stone on which it rests. The Forest Marble contains seven species, of which 

 four are common to this rock and the Cornbrash, which contains seventeen 

 species, most of which are found in the older formations ; with the deposition 

 of the Cornbrash the lower division of the Oolites terminate, and with it all 

 the species of Echinodermata found in these rocks became extinct. 



The middle division of the Oolites contains far fewer species than the lower. 

 The Kelloway rock and Oxford clay, so rich in Cephalopoda, have not in 

 England, as far as 1 can learn, yielded any remains of Echinodermata. The 

 Lower Calcareous grit, the Coral rag, and Upper Calcareous grit, have 

 several species in common ; of the nine species of the Lower Calcareous grit, 

 five are common to it and the Coral rag, which contains twenty species; but 

 I have not ascertained how many, if any, pass into the Upper Calcareous grit; 

 in fact these three stages in reality represent only one stratigraphical zone of 

 life. 



The Kimmeridge clay up to the present time is known to contain only 

 four species, which are all special to it. There is one species only in the 

 Portland sand, and one in the Marine Purbeck beds. The Portland Oolitic 

 limestone is said to contain the remains of Echinoderms, but I have not been 

 able to obtain any of the specimens for examination. 



