(ßn um Srntliiopok, nnii nit \\)t Bendoiiment 

 nf tjie Inop in Ctrrhratiila. 



BY MR. CHARLES MOORE, F.G.S. 



AT the tirae of the commencement of INIr. Daviclson'a 

 XJl monograph on British Brachiopoda, publisbed by 

 the Pal^ontographical Society, little had been done towards 

 their systematic arrangement and Classification. Sowerby 

 had figured many species ; but valuable materials were 

 accumulated, and niany new forms waiting for descriptiou 

 in the cabinets of difFerent coUectors, which have since 

 been done justice to in the above valuable publication. 



At the tirae referred to but fourteen species of the genera 

 Lingula, Orbicula, Spirifer, and Terebratula had been 

 figured from the three divisions of the Lias, but I had 

 succeeded in discovering twenty new species in the Middle 

 and Upper Lias of Somerset, including the genera Theci- 

 deum, Leptasna, and Crania, genera which had been pre- 

 viously unnoticed in these foi-mations. 



Of the genus Thecideura, the Middle Lias of Somerset 

 yielded nie three species, viz., T. Bouchardn, T. triangularis, 

 and T. Moorei. In tliis formation thcy are rare, and 

 when found are almost invariably attached to the plicated 



