CATALOG IK 



BLASTOIDEA 



GEOLOGICAL DEPARTMENT 



BRITISH MUSEUM 



(NATURAL HISTORY), 



WITH AN ACCOUNT OF THE MORPHOLOGY AND SYSTEMATIC POSITION OF THE GROUP. AND A 

 REVISION OF THE GENERA AND SPECIES. 



(ILLUSTRATED BY 20 LITHOGRAPHIC PLATES, &c.) 



BY 



ROBERT ETHERIDGE, Jun., 



OF HIE DEPARTMENT OF GEOLOGY, BRITISH MUSEUM (NATURAL HISTORY). 



P. HERBERT CARPENTER, D.Sc, F.R.S., F.L.S. 



(OF ETON COLLEGE). 



LONDON: 



PRINTED BY ORDER OE THE TRUSTEES. 



1S8C. 



