ON NEW BRACIIIOPODA. 173 



slightly rugose ; valves moderately convex ; deltidium 

 triangulär ; area broad and flattened ; hinge-line broad ; 

 front of sliell rounded. In some speclmens the shell 

 presents a uniformly flattened surfacc, \vliilst in the 

 majority the outer surface of the smaller valve possesses 

 mesial folds, and in the larger valve a central sinus. 



Obs. — This shell is not uncomraon in the Inferior Oolite 

 of Dundry. Although no internal characters have yet been 

 noticed, there seems little doubt the shell must be referred 

 to the genus Spirifera. It is pcrfectly distinct from a little 

 shell found with it, described by me in the Proceedings of 

 the Somersetshire Archmohgical and Natural History Society 

 for 1854. We have thus evidence of the presence of two 

 sijecies of this genus in oolitic strata, although in both 

 instances they have become very degenerate in size. No 

 larger specimens of the genus have yet been found in the 

 same beds to which these diminutive shells can be referred. 



Tekebratula (?) MINUTA, Moore. 

 PI. II., figs. 21, 22. 



Shell very small, smooth, incquivalve, longitudinally 

 oval, with large triangulär deltidium ; valves equally con- 

 vex ; hinge-line straight. The dorsal valve is usually 

 Square, and its inner side possesses a broad flattened septum 

 ncarly the length of the shell, and dividing it into two 

 equal portions. 



Obs. — I have been unablc to determine the form of the 

 loop of this shell, and until this has been scen it will be 

 doubtful whether it be a true Terebratula. Should it be 

 such it will be the smallest known species with which we 

 arc acquainted. It is from the coraline bcd of Ilampton 

 ClifFö, Bath. It differs entirely from any other Terebratula 



