398 Geological Society : — 



dip at a considerable angle to the south, or where they are vertical, 

 with an approximately east and west strike, similar appearances 

 might be discovered, irrespective of the outline and inclination of 

 the ground. 



In the author's opinion the curving back of the slaty laminae in 

 this district must have been produced by a great weight of solid 

 matter propelled in a southerly direction. 



June 19, 1867.— Warington W. Smyth, Esq., M.A., F.R.S., 

 President, in the Chair. 



The following communications were read : — 



1. " On Cyclocyathus, a new genus of the Cyathophyllidea, with 

 remarks on the genus Aulophy Hum." By P. Martin Duncan, M.B., 

 Sec. G.S., and James Thomson, Esq. 



A careful examination of a large series of sections and weathered 

 specimens of Corals from near the base of the Carboniferous series 

 at Lesmahago &c, which have hitherto been referred to the genus 

 Aulophy Hum, E. & H., has convinced the authors that A. fungites 

 and A. Boiverbanki must be referred to a new genus, which they 

 propose to name Cyclocyathus. It differs from Aulophy Hum in having 

 a more or less essential columella of a very complicated structure, 

 while that genus was described by its authors as devoid of any 

 such structure. One form in the series of specimens examined by 

 Dr. Duncan and Mr. Thomson exhibited no columella, and the space 

 which would otherwise have been occupied by it was covered in by 

 successive tabulae ; they therefore referred it to Aulophyllum, under 

 the name of A. Edwardsi. 



2. " On the discovery of a new Pulmonate Mollusk (Conulus 

 priscus, P. P. Carpenter) in the Coal-formation of Nova Scotia." 

 By J. W. Dawson, LL.D., F.R.S., F.G.S. 



Some crushed specimens of the little shell described in this paper 

 were found in a bed of clay, associated with numerous individuals of 

 Pupa vetusta, between coals No. 37 and No. 38 of the Joggins 

 section, during a search undertaken for the purpose of discovering, 

 if possible, traces of land-animals in addition to the Pupa already 

 known. On submitting these specimens to Dr. P. P. Carpenter, 

 they were referred by him to the group Conulus, a subgenus of 

 Zonites ; and he has added to Dr. Dawson's paper a description of 

 the characters which they present. 



3. " On some tracks of Pteraspis (?) in the Upper Ludlow Sand- 

 stone." By J. W. Salter, Esq., A.L.S., F.G.S. 



Impressions upon two slabs discovered by Mr. R. Banks in the 

 Downton or Upper Ludlow Sandstones of Kington, Herefordshire, 

 were described by Mr. Salter as the tracks of Pteraspid fish. His 

 reasons for assigning this origin to the imprints were partly based 

 upon their character, and partly on the fact that the Pteraspis was 

 the only known creature of the period capable of making the im- 





