Geological Society of London. 331 



bones were found there was a distinct valley in the London Clay, 

 running in a direction nearly due north and south, the inclination 

 of the valley being towards the north. The London Clay reached 

 nearest to the surface towards St. Pancras Church and in Upper 

 Woburn Place, the total thickness of the overlying deposits and the 

 made ground there being only about 12 feet. 



Other sections, given along the southern side of Tavistock and 

 Gordon Squares and through Gordon Street and the western side 

 of Gordon Square, show varying thicknesses of the deposits, over- 

 lying the uneven floor of London Clay, of from 16 to 21 feet; the 

 greatest thichness here is found at the north-western corner of 

 Gordon Square. 



Seeds were also discovered in a loam near the bottom of Gordon 

 Street, at the same horizon as that containing the mammalian 

 remains, and some shells were found in a band of sandy clay 

 under a calcareous deposit, about half-way down the western side 

 of Gordon Square. 



The Author says that the deposits above the mammaliferous 

 loam overlying the London Clay in this area cannot be classed as 

 post-Glacial river-deposits, but must be considered as of Glacial 

 origin. The animals, therefore, which evidently died on the old 

 land-surface where their remains were found, lived there early 

 in the Glacial period. 



4. " The Morphology of Stephanoceras zigzag." By S. S. Buckman, 

 Esq., F.G.S. 



Material which has come into the author's possession throws light 

 on the developments of Stephanoceras zigzag, and such developments 

 seem to supply missing links in the connexion of Bathonian and 

 Bajocian species. 



The author separates the developments of S. zigzag into three 

 series, and discusses the allied forms of each. 



IL— June 8th, 1892.— W. H. Hudleston, Esq., M.A., F.R.S., 

 President, in the Chair. The following communications were read : 



1. " The Tertiary Microzoic Formations of Trinidad, West Indies." 

 By R. J. Lechmere Guppy, Esq. (Communicated by Dr. H. Wood- 

 ward, F.R.S.) 



After giving an account of the general geology of the island, and 

 noticing previous memoirs devoted to that geology, the author 

 describes in detail the characters of the Naparima Beds, to which he 

 assigns an Eocene and Miocene age. He considers that the Nariva 

 Marls are not inferior to but above the Naparima Eocene Marls, and 

 are actually of Miocene date. 



Details are given of the composition and characters of the 

 ' argiline,' the foraminiferal marls occasionally containing gypsum, 

 and the diatomaceous and radiolarian deposits of Naparima. 



The Pointapier section is then described, and its Cretaceous Beds 

 considered, reasons being given for inferring that there was no 

 break between the Cretaceous and Eocene rocks of the Parian area. 



Detailed lists of the foraminiferal faunas of the marls are given, 

 with notes. 



