1869.] TAWNEY TEREBEATTJLA DIPHTA IN THE ALPS. 305 



vest's and Dana's theory in explanation, viz. that it is due to the 

 greater contraction of the earth's crust beneath the ocean, which 

 causes it to sink, while the land on either side becomes elevated by 

 lateral pressure, and by both processes necessarily drained. 



2. On the Fokmation of the Chesil Bank, DopvSet. By H. W. 

 Bristow, Esq., F.R.S., F.G.S., and Wm. Whitaker, Esq., B.A., 

 E.G.S. 



[This paper has been withdrawn by the permission of the Council.] 



3. On a Raised Beach at Portland Bill, Dorset. By W. 

 Whitaker, Esq., B.A., F.G.S. 



[This paper has been withdrawn by the permission of the Council.] 



4. On the Occurrence of Terebrattjla diphya in the Alps of the Canton 

 DE Yatjd. By E. Tawney, Esq., F.G.S., Assoc. R. Sch. Mines. 

 With a Note hy Thomas Davidson, Esq., F.R.S., F.G.S. 



In answer to certain statements of Prof. Hebert as to the probability 

 of the non- occurrence of Terehratula diphya in the Jurassic Series 

 (Bulletin Soc. Geol. de France, vol. xxiii. p. 530, 1866), it may be 

 well to put on record the following discovery of this species in strata 

 in the Alps of the Canton de Yaud, which belong indubitably to the 

 Oxfordian series. This is, I believe, the first time that this species 

 has been found in Jurassic beds in the Canton. 



In the summer of 1867, when exploring the geology of the valley 

 of the Sarine, near Chateau d'Oex (Canton de Vaud), I came upon 

 this fossil in a block of Oxfordian limestone, among the "eboulis" 

 around the chalets of Paray Charbon : these blocks, which are nearly 

 all Oxfordian, have fallen from the ridge of the Yanil Noir. This 

 range, from Mont Cray to Dent de Branleire, which forms here the 

 boundary between the Cantons de Yaud and Fribourg, is formed by an 

 arch of Bajocian (Inf. Ool.) dark grey limestones and shales, sur- 

 mounted by the Oxfordian series at the K.E. end (Dent de Branleire, 

 &c.) ; but the vault rises higher where the chain becomes lower, so 

 that at the S.W. end the Oxfordian is thrown off only at the sides, 

 and is quite cut away from the top, the summit of Moot Cray being 

 Bajocian. 



As our locality is about the middle of the range, the Oxfordian 

 is seen at some height in the precipices above the chalet. 



The Bajocian, which contains Zoophycos scoparius (Heer) abun- 

 dantly here, and Amm. Humphriesianus, consists of dark- coloured 

 limestones and shales, and is in strong contrast to the blocks of Ox- 

 fordian limestone which lie upon it ; the latter here is a limestone 

 of lithographic texture and conchoidal fracture. It could not be 

 mistaken for the Neocomian, being thicker-bedded and full of 



