Oeological Society. •'>07 



strali,2;rai)hy of the aroa is briotly discussed, reference beinp: made to 

 the more important forms. Following this, the exposures examined 

 are classilied in zonal order, and tabulated under the zonal head- 

 ings. The best exposures of each zone receive special attention. 



A correlation with the Bristol area brings out the following more 

 important points. The faunal succession is essentially similar in 

 the two areas ; and in both there is good ground for a twofold 

 division intoClevedonian and Kidwellian stages, the line of separation 

 being drawn at the top of the Si/ruir/otJn/ris-Zone. The Mendip 

 area exhibits, however: (I) a great expansion in the thickness of 

 the Za/)Jirentu-- and Si/rl tiffothi/ris-Zoues ; (2) a continuously- 

 fossiliferous secjuence from the top of the Zaphrcntis-'/jona to 

 the base of the Seminula-Zone, possessing a characteristic coral- 

 and brachiopod-fauna ; and (3) a relative acceleration of the 

 coral-fauna on the brachiopod-fauna, exhibited in the Zaphrentis- 

 Zone. 



The paper contains a detailed account of the Ebbor-Rocks 

 District, near Wells, and concludes with notes on certain corals and 

 brachiopods included in the faunal lists, together with descriptions 

 of some new species and mutations. 



March 7th, 1900.— Sir Archibald Geikie, D.C.L., Sc.D., Sec.R.S., 

 President, in the Chair. 



The following communication was read : — 



* Liassic Dentaliidic' By Linsdull Richardson, F.G.S. 



Among the fossils collected in the cuttings on the new Honey- 

 bourne & Cheltenham Railway were many belonging to the family 

 Dentaliidaj; and as the majority are new, the Author has investigated 

 the Liassic members of the family contained in his own collections 

 and in those of numerous museums. The growth of the scaphopod- 

 shell is effected by additions at the anterior end, while the pos- 

 terior end suffers by wear and absorption. The members of this 

 class are essentially marine, inhabiting deep water, and feeding 

 principally on foraminifera. The word Dental iinn is used in the broad 

 sense, and not in the restricted sense of a shell with strong longi- 

 tudinal costne. Kiglit new species are described, and eight species 

 already known are discussed. 



March 21st, lOUO.— Aubrey Slrahan, M.A., F.R.S., Vice-rresidcnt, 

 in the Chair. 



The following communication was read : — 



'Brachiopod Ilomocomorphy : Piiriope, Antinomla, P>/i/i(es.' 

 By S. S. liuckman, F.C.h?. 



This paper deals with the diphyoid TerebratuliT?, of which so 

 many species have borne the name Tcrebratida dipJnfu (Colonna). 



