14 



Bolton, Palceontology of the Manx Slates. 



EXPLANATION OF PLATE L 



Figs. I, 2. Dictyonema {Dtctyograptus) sociale Salter, asso- 

 ciated with Dendrograptus Jiexuosus 'RaW ; in 

 Fig. I the latter species occupies the middle 

 of the slab, and is disposed at right angles to 

 the former. 

 Horizon and locality : Manx Slates ; Cronk 

 Sumark, near Sulby Glen. Collected by the 

 author. 



Manchester Museum Collections. 



Figs. 3, 4. PalcBochorda minor McCoy. 



Horizon and locality : Lonan Flags ; cliff south- 

 west of Onchan Harbour, near Douglas 

 Collected by Mr. G. W. Lamplugh, F.G.S. 



Geological Survey Collections. 



Fig. 5. PalcBOchorda minor McCoy. 



Horizon and locality : Lonan Flags ; north side 

 of Martha Gullet, Langness. Collected by 

 Mr. G. W. Lamplugh, F.G.S. 



Geographical Survey Collections, No. L81. 



Fig. 6. Palceochorda major McCoy. Worm-track only upon 



surface of a fine cleaved slate. 

 Horizon and locality : Manx slates ; quarries on 

 north side of Maughold Head, near Ramsey. 

 Collected by the author. 



Manchester Museum Collections. 



