PLATE XVII. 

 Pleurograptus— c on tin ued. 



FIGS. 



1. — Pleurograptus linearis (Carruthers). 



Large specimen showing numerous simple and compound branches. 

 Hartfell Spa, Moffat. Hartfell Shales. Lap-worth's Collection. 



2. — Pleurograptvs linearis, var. simplex, Lap-worth, MS. 



Specimen with only a few simple branches. Hartfell Spa. Hartfell 

 Shales. Lap worth's Collection. 



