Reports and Proceedings — Geological Society of London. 39 



complications of a most intricate character, due to folding and 

 faulting. Much detailed work was therefore necessary before even 

 the broader tectonic features could be deciphered. 



The three main divisions of the Devonian formation have now 

 been made out and their boundaries ascertained with approximate 

 accuracy, and brought into line with their Continental equivalents. 



Seventeen sections in the text serve to illustrate the numerous 

 faults, folds, and contortions which the Devonian series of Torquay 

 have undergone, and graphically express the difficulties in tracing 

 out and mapping this varied and complicated area. The annexed 

 table may serve to shovv the several subdivisions which are recognised, 

 together with their foreign equivalents and localities (see p. 38). 



The author furnishes lists of fossils from Lummaton (pp. 66-68), 

 and refers to the Rev. G. F. Whidborne's monograph on the Devonian 

 Fauna (Pal. Soc. Mon.) for authorities. Summarised, they show: 

 TrilobitalT, Phyllocarida 1, Ostracoda 9, Entomides 2, Cephalopoda 

 16, Gasteropoda 48, Lamellibranchiata 30, Brachiopoda 72, Discina 1, 

 Crania 1, Bryozoa 14, Eohinodermata 10. In chapter vii, under 

 Post-Tertiary and Recent Deposits (p. 13), there is given a summary 

 of cavern deposits, including the historic caves of Kent's Hole, 

 Torquay, and Brixham Cave. Lists of the animals discovered are 

 given, and, under the account of the Raised Beaches, carefully 

 prepared lists of the Mollusca. 



There are no economics to deal with in this area beyond Building- 

 stones, Road-metal, and Ornamental Marble works in which slabs 

 of Devonian Coral limestone are chiefly employed, good examples 

 of which may be seen in the Survey Museum and the Geological 

 Gallery of the Natural History Museum in Cromwell Road. 



The six-inch maps of this area have been deposited in the Survey 

 Office for reference, and copies may be obtained at cost price. 



laiBIF'OE-TS -A-IfTID ^>S,OGEi:BZDIl<r(3-S. 



I. — Geological Society of London. 



November 18th, 1903.— Sir Archibald Geikie, D. Sc, F.R.S., 

 Vice-President, in the Chair. The following communications 

 were read : — 



1. "Notes on some Upper Jurassic Ammonites, with special 

 reference to Specimens in the University Museum, Oxford." By 

 Miss Maud Healey. (Communicated by Professor W. J. Sollas, 

 M.A., D.Sc, LL.D., F.R.S., F.G.S.) 



In the course of rearranging the Upper Jurassic fossils in the 

 Oxford University Museum, the attention of the authoress has been 

 called to the large amount of prevailing misconception with regard to 

 Sowerby's species Ammonites plicatilis and Jm. biplex. The type- 

 specimen of Perisphinctes jAicatilis (Sow.) is refigured and described. 

 It is in the form of a cast, but only an indefinite statement exists as 



