MOORE — ON NEW BRACHIOPODA, ETC. 



99 



Discina orbicularis. Moore. PI. ii., figs. 16 — 18. 



Shell small, orbicular, tapering to an elevated apex, giving the 

 shell a somewhat conical form ; margin smooth and rounded. Outer 

 surface of valve smooth, with numerous concentric lines of growth ; 

 the inner smooth and very concave. 



Obs. — This shell does not appear to have attained a larger size 

 than is indicated in pi. ii., fig. 18. It is from the fish-bed and the 

 clays associated therewith in the Upper Lias of Ilminster. By its 

 form it is readily distinguished from any other species. 



Discina Townshendii. Forbes. 



A very fine specimen of this shell, belonging to the Museum of 

 Economic Geology, was figured by Mr. Davidson in the volume of 

 the Palseontographical Society for 1850. Its locality was then un- 

 certain, though Mr. Davidson was informed it was from the Oxford 

 Clay. Subsequently it was suspected to be from one of the lower 

 beds of the Lias. Having discovered the species in the " Avicula 

 contorta zone" at the base of the Lias, near Taunton, I am enabled to 

 settle its position. M. Edward Suess, of Vienna, has informed me 

 that he has also obtained the shell in the Rhretie beds of Austria, 

 in which the "Avicula contorta zone" is included. 



Discina Humphrey siana. Sowerby. 



This species has hitherto been found only in the Kimmeridge Clay. 

 It may be desirable to record its presence in the Coral Rag of Lyne- 

 ham, where it is abundant. 



fflnjnclionella spinosa. Schlotheim. 



In the Cotteswold and other lower oolites this shell has been sup- 

 posed to indicate a particular zone. Although it is therein especially 

 abundant, it is by no means confined to it. I have obtained the 

 species from the Fuller's Earth, near Bath, and also in the Bradford 

 Clay. Some very dwarfed or young forms of it are to be found in the 

 upper beds of the Inferior Oolite of Dundry. 



Terebratula carinata. Lamarck. 



This shell has hitherto been found only in the Inferior Oolite. 

 Some specimens smaller than the type-form are to be found in the 

 coralline bed of Hampton Cliffs, which I am unable to distinguish 

 from this species. 



(To be Continued.) 



