THE BRITISH FOSSIL BRACHIOPODA. 279 



45. Discina Gunnii, Dav. Dav., Appendix to Supplements, Vol. V, PI. XX, fig. 19. 



Shell oval unattached valve ; conical, longer than wide, rather broader anteriorly, 

 summit situated at rather less than one third of the length of the shell from the posterior 

 margin ; anterior margin rounded, posterior margin very slightly indented ; test shining, 

 concentrically finely striated, with here and there a stronger line of growth : attached or 

 lower valve not known. 



Length 10, breadth and height 4 lines. 



Obs. — Very few species of Discina have been found in our British Jurassic rocks, 

 Discina reflexa, Sow., being the only species I know of that has passed from the Upper 

 Lias into the passage-beds, which constitute the lowest portions of the Inferior Oolite. 

 Discina reflexa proper is smaller in size and proportionately more elevated or more 

 conical than the shell under description, which was found by Mr. Gunn, in company 

 with Mr. T. Beesley, in a light-coloured grit in the Inferior Oolite at Hook Norton 

 Railway cutting (Banbury and Cheltenham Railway), at about seven miles south- 

 west of Banbury. Mr. Beesley informs me that at present he can hardly say more than 

 that the zone of the Inferior Oolite where the Discina was found is the lowest of the 

 section at that place, where it rests upon what is usually taken for Upper Lias clay, but 

 which contains Lower Inferior Oolite Ammonites (Am. opalinus and Am. Murchisoni). 



I have named the species after Leonard Gunn, Esq., Treasurer of the Banbury 

 Natural-History Society. The specimen forms part of Mr. Beesley's fine local collection. 



Mr. E. Walford has obtained in the Upper Lias of the same locality a specimen of 

 Discina rejlexa, but it is not more than half the size of D. Gunnii. 



I avail myself of this occasion to mention that the Rev. P. B. Brodie has found in 

 the Middle Lias of Robinswood Hill, Gloucester, a circular Discina, 6 lines in length 

 by the same in breadth, and 2 in height, with a sub-marginal apex ; the surface of the 

 upper valve being finely concentrically striate. 



The same distinguished geologist found also in the Lower Lias (Lima beds and shales) 

 of the Vale of Gloucester and Harbury, near Leamington in Warwickshire, a small 

 Discina, which looks like D. Iloldeni, but is smaller, is nearly circular in shape, and 

 measures a little over a line in length and breadth. 



A small Discina, probably a small example of Discina LTump/tresiana, was found by 

 the Rev. J. P. Blake in the Portland Sand, Portland. 



