Reports & Proceedings — Geologists Association. 189 



constituting the genus Lonsdaleia ; it includes also a description of 

 Dibunophyllum rugosum (McCoy). The author's reasons for including 

 a description of D. rugosum in the paper are, first, the fact that the 

 species was originally described by McCoy as Lomdaleia rugosa ; and, 

 secondly, that considerable confusion exists between it and the 

 fasciculate forms of Lonsdaleia. 



Lomdaleia is a compound member of the Clisiophyllidse, and occurs 

 both as fasciculate and as massive colonies. The chief distinguishing 

 features of the genus are the wide extrathecal area, large dissepiments, 

 complex central column, and horizontal and widely-spaced tabulae. 

 Lonsdaleia is an Avonian or lower Carboniferous genus, especially 

 abundant in the highest horizons of that series (D 2 and higher beds). 

 The earliest example is Lonsdaleia preenuntia, from the Syringothyris 

 zone (C). 



A number of species and local forms have been recognized and are 

 described. 



II. — Geologists' Association. 



March 26, 1915. The following paper was read : — 



" On the Structure of the Eastern Part of the Lake District." By 

 J. F. S. Green, B. A., F.G.S. 



The paper relates to the Lower Palaeozoic rocks of the country 

 between Ullswater, Shap, and Stile End. The author summarizes the 

 literature dealing with the area, and the divergent views as to its 

 structure. A great tuff band has been traced all over the district, 

 and the succession worked up and down from it. This succession 

 proves to be identical with that near the Duddon Estuary, but the 

 andesites are mainly concentrated at two definite horizons. By the 

 aid of this succession it is shown that, as in the district previously 

 investigated, the Borrowdale Volcanics rest conformably on the 

 Skiddaw Slates, and are unconformably overlain by the Coniston 

 Limestone Series, the junctions being unfaulted. The existence of 

 separate basic and ' streaky ' groups is not confirmed. 



An important basal sandstone and conglomerate belonging to the 

 Coniston Limestone Series, but hitherto confused with the underlying 

 volcanics, is described. The folding is discussed, especially powerful 

 overfolds in the neighbourhood of Haweswater. Faulting is con- 

 sidered, with special reference to the lag-fault hypothesis. 



III. — Edinbuhgh Geological Society. 



February 17, 1915. — Dr. R. Campbell, President, in the Chair. 



1. " The Evolution of the Cartography of Prince Charles Foreland." 

 By W. S. Bruce, LL.D., F.R.S.E., and John Mathieson, F.R.S.G.S. 



The paper described the evolution of the cartography of Prince 

 Charles Foreland from its discovery in 1598 to its complete survey 

 in 1909. 



