PLATE VII. 

 Grenus Trochograptus, Holm. 



FIG. 



1. — Trocliograiitus difusus, Holm. 



Specimen showing disc. Figured, Elles, Quart. Journ. Geol. Soc, vol. 

 liv, pi. xxvii. New Quarry, Scow Gill. Middle Skiddaw 

 Slates. Fitz-Park Museum, Keswick. 



