LIST OF ILLUSTRATIONS. 
Plates 1 to 7. — Professor W. C. Williamson on the Organization of the Fossil Plants 
of the Coal-measures. 
Plates 8 & 9. — Mr. H. N. Moseley on the Structure and Relations of certain Corals. 
Plates 10 to 15. — Dr. R. yon Willemoes-Suhm on the Development of Cirripedia. 
Plates 16 to 18. — Mr. F. M. Balfoue on the Development of the Spinal Nerves in 
Elasmob ranch Fishes. 
Plates 19 to 31. — Professor Owen on the Fossil Mammals of Australia. 
Plate 31*. — Mr. Chaeles S. Tomes on the Development of the Teeth of Fishes. 
Plates 32 & 33. — Mr. G. J. Romanes on the Locomotor System of Medusae. 
Plate 34. — Professor Osboene Reynolds on the Refraction of Sound by the Atmosphere. 
