ON NEW BRACIIIOPODA. 169 



dlstancG beyond the outer margin of tlie shell. The 

 interior of the valve is concavc, showing two pairs of 

 muscular impresslous, not strongly inarked ; the anterior 

 pair curving upwards to^yarda the posterior, which are 

 rounded and larger. When viewed from the inner side 

 the valve is scen to be surrounded by a flattened ridge, 

 which is continued outwards in long spinöse expansions, 

 which are furnished with narrow longitudiual gi'ooves, or 

 canals, through the whole of their length. 



Obs. — This is one of the most beautifiü species of this 

 interesting genus of shells. It is from the raggy beds of 

 the Inferior Oolite of Dundiy, which have furnished me 

 with so many new forms of Brachiopoda. The upper valve 

 only is known. 



Crania Sandersii, [Moore. 

 PI. IL, figs. 11, 12. 



Shell rounded ; exterior of the valve flattened, or slightly 

 convex ; surface wrinkled ; shell-structure smooth. The 

 interior of the valve shows four muscular imjiressions ; tiie 

 Upper pair being rounded and depressed, the anterior, 

 occupying the middle of the valve, are raised and promi- 

 nent, ear-shapcd, and curved outwardly. 



Obs. — By its exterior it would be difficult to distinguisli 

 this shell from the C. antiqidor of the Great Oolite of 

 Hampton CllfFs, but the interior of the valves difFer. In 

 the C. Sandcrsn the two pairs of muscular impressions 

 are more widely separated, the lower pair being much 

 strenger, and in shape differeut from those of the C. anti- 

 quior, and there is also the absence bcncath them of a 

 longitudinal ridge usually present in the latter shell. 



It is from the Inferior Oolite of Dundry, near Bristol. 

 I have mucli plcasurc in naming it after Wm. Sanders, 



VOL. X., 1860, I'AUT II. X 



