CATSKILL GROUP. 



191 



55. 



Nos. 55 and 56 are also in the State Collection, and were found between Bainbridge and 

 Colesville ; they are of the natural size, both being fragments. 



No. 55 resembles in structure the one given in the Hamilton group, the raised parts being 

 larger, and more numerous upon the same extent of surface in this than in the other group. 



No. 56 is covered with punctations, semi-regularly disposed longitudinally, inducing a belief 

 that its surface is slightly channelled. Both specimens are in the State Collection ; the first 

 is in sandstone with some shale, the latter with little or none. 



There is another plant from this group, and from the same section of the State, in the Col- 

 lection of the Albany Institute. The surface appears to consist of numerous raised diagonal 

 lines or divisions crossing each other, dividing the surface in small lozenge-shaped forms and 

 cavities. These, when examined by a microscope, show a series of alternate segments of 

 lenses, which cause the lozenges wholly to disappear ; the parts which separate them, when 



