SHARPE — ^BOULONNAIS. 249 



The mass of schist from Caffiers now in the Boulogne Museum 

 contains many specimens of the fossil in question, and undoubtedly 

 some of them strongly resemble Graptolites ; but the best-preserved 

 specimens exhibit characters which prove them to be plants ; they 

 consist of slender stems bearing two rows of closely set alternating 

 leaflets, the bases of which overlap ; the leaflets are sessile, lanceolato- 

 ovate, with a strong midrib ; they resemble in form the leaves of 

 Knorria, but are set in two rows on opposite sides of the stem instead 

 of encircling them as in that genus. 



It thus appears that there remains nO evidence whatever for class- 

 ing any of the deposits of the Boulonnais in the Silurian system. 



[D. S.] 



[See List of Fossils, in the following pages. '\ 



