Trans. L'pool. Biol. Soc. 



Vol. XII., PI. II. 















| 1 





w gm 





-'•"• ^Kj 



'""-* .---'"-' T 



IlllipFV 



§BP^ 



" s 



CUVIER. 



ERASMUS DARWIN. 



EDWARD FORBES. 



WYVILLE THOMPSON. 



