SUPPLEMENT. 



.109 



from being entire. The branches are serrated on one side : serratures 



somewhat closely arranged. 



The specimen shows the lower or non-serrated surface, and several of the longer 

 branches are turned sufficiently on one side to show the serrations in a tolerable 

 degree of perfection. 



Fig. 8. The specimen, natural size. 



Graptolithas mnltifasciatas. 



GraptolitliDS divergens (n.s.). 



Boot slender, consisting of a straight central stipe or rachis, on each side 

 of the longitudinal centre of which are given off diverging branches in 

 pairs, and nearly opposite each other at the bases : these branches are 

 of unequal length, the longest being frequently as long as the main 

 stipe on either side of its centre. Branches slenderly serrate on one side. 



Fig. 9 is an individual of this species, one brancli of wliicii appears 

 to bifurcate near its origin. 



These species are from the shales of the upper part of the Hudson-river group. 



