

THE GENERA. 



OF 



RECENT MOLLUSCA; 



ARRANGED 



ACCORDING TO THEIR ORGANIZATION. 



BY 



HENRY ADAMS, F.L.S. 



AND 



ARTHUR ADAMS, M.R.C.S., F.L.S. 



IN THREE VOLUMES. VOL. II. 



LONDON : 



JOHN VAN VOORST, PATERNOSTER ROW. 



MDCOCLVril. 



