ON THE 



NATURAL HISTORY 



PROTOCOCCUS PLUVIALIS, 



BY FERDINAND COHN. 



[Abstracted from the 'Nova Acta Acad. Cses. Leop. Carotin. Naturae, 

 Curios. Bonn,' torn, xxii, pp. 605764, 1850.] 



BY GEORGE BUSK, F.R.S. 



