22 



Sv. Leonh. Törnquist. 



and proximal fragments, sometimes seen on one and the same hand-piece. They 

 occurred there on an horizon not far from that characterized by Monograptus turri- 

 culatus. 



Note. Monograptus triangulatus Haekn. is succeeded by a group of unques- 

 tionable Monograpti characterized by the fact that a number of the oldest thecae 

 are linear and isolated, while the following ones are triangular and in contact with 

 each other, though without overlap. For all I know, this group does not range up 

 to the top of the Rastrites division; and the spirally enrolled Monograpti of younger 

 deposits show a quite different structure of the initial end. 



Printed December 28:th, 1907. 



