[ viii ] 



XXI. On the Double Metamorphosis in the Decapodous Crustacea, exemplified in 

 Cancer Msenas, Linn. By J. V. Thompson, F.L.S. Deputy Inspector- General 

 of Hospitals. Communicated by Sir James Macgrigor, Bart. M.D. F.R.S. 359 



Index 365 



Appendix. 



Meteorological Journal kept at the Apartments of the Royal Society, by order of the 



President and Council. 



ERRATA. 

 Page 37, line 12. For allied to N. clausa, read allied to N. clausa, Zool. Journal. 

 Page 37, line 19. For Murex Rnmphius, Mont., read Murex Bamfius, Donov. 

 Page 37, line 21. For Fusus corneus read Fusus antiquus, Linn. 



