On some Brachiopoda found on the Coast of Norway. 257 



The subgenus Limea has hitherto been distinguished from 

 Lima solely by the presence of a series of parallel teeth upon 

 each side of the hinge-plate, a feature which cannot be ascer- 

 tained in the majority of specimens ; and the only British species 

 of Limea hitherto described has so little in its general aspect to 

 separate it from the young condition of Lima duplicata (a shell 

 which is associated with it in the same beds), that any clear ex- 

 ternal distinction which can be ascertained between them is 

 worthy of notice, more especially when it will also be found to 

 characterize Limea as a subgenus. 



It is in the auricles that the distinctive feature resides, and it 

 is immediately connected with the hinge-plate beneath : it will 

 be found that the radiating lines which usually ornament the 

 surfaces of the auricles in the Pectens and Limse also exist in 

 Limea, but that in the latter they abruptly disappear towards the 

 outer angle of each auricle, leaving a small triangular smooth 

 area, which is traversed transversely downwards and inwards by 

 a few elevations ; these are placed immediately over and corre- 

 spond to the grooves which separate the teeth upon the hinge- 

 plate. In all well-preserved specimens this kind of surface is 

 visible upon one or both of the auricles, its distinctness depend- 

 ing upon the condition of the specimen with reference to fossi- 

 lization and the greater or less prominence of the internal 

 features. 



Limea duplicata is abundant in the shelly oolite of Leck- 

 hampton Hill ; there is also another more ornamented but un- 

 described species higher in the same formation, and found at 

 many locahties in the upper Ragstones of the Cotteswold Infe- 

 rior Oolite. The peculiarity of the auricles is observable equally 

 in both these species. 



XXIII. — Notes on the Brachiopoda observed in a Dredging Tour 

 with Mr. M' Andrew on the Coast of Norivay, in the summer of 

 the present year. By Lucas Barrett, F.G.S.* 



In the course of our cruise we met with four species of Brachio- 

 poda, belonging to three out of the four recent families of those 

 shells. Fresh specimens of one or more of these were obtained 

 almost daily for two months, and as during that time we were 

 within the Arctic circle, enjoying perpetual sunlight, the oppor- 

 tunity of watching their movements was extremely favourable. 

 1 . Terehratulina caput-serperitis. This species shows more of 



* Commuuicated by the Author, having been read at the Meeting of the 

 British Association at Glasgow, Sept. 18, 1855. 



