.249 



On some Ostracocla from the Fullers-earth Oolite and Bradford Clay. 



By Professor T. Rupert Jones, F.R.S., F.G.S., and 



C. Davies Sherborn, Esq., F.G.S. 



(Read November 16th, 1887 J : 



[Plates i. — v.] 



Introduction. — In a short paper on Jurassic Microzoa in the 

 Geological Magazine for June, 1886 (pp. 271—274), we referred 

 in detail to each of the hand-specimens courteously supplied to 

 us a few weeks previously by the Kev. H. H. Winwood, F.G.S., 

 and H. B. Woodward, Esq., F.G.S., of the Geological Survey. 

 Amongst them were examples of the Fullers-earth Clays, from 

 Midford, containing Ostracoda. These minute bivalved Entom- 

 ostracan Crustacea are the subject of the present memoir. 



The Ostracodes were obtained from the blue and yellow clays 

 of the Fullers-earth Oolite, as exposed in the sections at Midford, ' 

 near Bath.* One of the two blue clays is directly under the 

 Great Oolite. Not far beneath is a yellow Fullers-earth Clay ; 

 and this rests upon the sectind bed of blue clay. Very few 

 Microzoa (not 10 per cent.) were found in the yellow bed. 



The Rev. H. H. Winwood has also sent us a small piece of 

 the Fullers-earth Rock,t from near Bath, as it contained some 

 Ostracodes. These are rather obscure on account of their embed- 

 ment in the matrix, but are evidently a Bairdia and a Cytherella, 

 and are probably of the same species as some of those from 

 the clays. 



Several specimens from the base of the Fullers-earth Oolite, 

 near the Cotteswolds (see p. 256), have been courteously sub- 



* The Clays at Midford are mentioned in H. B. Woodward's 

 " Geology of England and Wales," 2nd edition, 1887, p. 297. 



t Mentioned in H. B. Woodward's *' Geol. England and Wales," 

 2nd edition, p. 295. 

 Vol. 6, No. 3. 



