Geological Society. 267 



wear, the two hindmost divisions of this tooth not having risen into 

 use. 



It is shown that these first teeth of E. primigenius differ much 

 less from the corresponding milk-molars of the Indian Elephant 

 than the later teeth do, the thickness of the constituent enamel- 

 plates being but little less in proportion, and the principal distinc- 

 tion being the greater relative breadth of the second molar, espe- 

 cially towards the base of the crown. 



4. " On the Stratigraphical Position of the Lower and Middle 

 Jurassic Trigonice of North Oxfordshire and adjacent districts." By 

 Edwin A. Walford, Esq., F.G.S. 



The author spoke of the value of the Trigonice as stratigraphical 

 guides and of the wealth of the Oolitic deposits of North Oxfordshire 

 in number of species as Avell as of individual forms. He alluded to 

 the recent discovery by Northampton geologists of Trigonia literata* 

 and T. pulchella in the centre of their county. By the presence of 

 certain Trigonice as well as of corals and bored stones he endeavoured 

 to prove the extension of a stratum at the base of the Clgpeus-grit 

 at Fawler, as far as Hook Norton, also in North Oxfordshire, where 

 the bulk of the Inferior Oolite was of an altogether different type. 

 In Mr. Walford's list were nearly thirty species and varieties from 

 the Bajocian beds. To the lower horizons there belonged but one 

 local form and no species of special stratigraphical value. The 

 presence of a few other fossils supposed to be characteristic was the 

 only evidence of beds below the zone of Ammonites Murchisonice. 

 Series C, which appeared to be of the age of the lower Trigonia- 

 grit, had yielded the greater part of the Trigonia} mentioned, several 

 of them being peculiar to the horizon, whilst others were local 

 species. The higher beds had yielded some apparently undescribed 

 forms, whilst hitherto unrecorded species were quoted from the 

 Great Oolite and Forest Marble. One Oolitic species (T. Lycettii) 

 was described as new. 



December 3, 1884.— Prof. T. G. Bonney, D.Sc, LL.D., F.E.S., 



President, in the Chair. 

 The following communication was read : — 



" On the Lower Eocene Plant-beds of the Basaltic Formation 

 of Ulster." By J. Starkie Gardner, Esq., F.G.S. 



The paper commenced with a brief outline of the physical features 

 of the basaltic area in Ireland. The beds whence plants have been 

 obtained form a quadrilateral, the angles of which are Ballintoy, 

 Glenarm, Ballypalady, and Lough Neagh. The Ballintoy beds are 

 very incompletely explored, and have so far yielded few species. The 

 Glenarm beds are situated in a disused mine, filled with water, 

 which was drained by the author. The plants are well preserved 

 in a matrix of white sandy clay. The Ballypalady plants are less 



* The author subsequently came to the conclusion that this was a 

 distinct species, which he has described under the name of T. north-* 

 amptonensis. 



