316 Br. F. A. Bather — Studies in Edrioasteroidea. 



churchyard. Here flaggy sandstones with, a low southerly dip rest 

 upon an irregular surface of massive limestone. These sandstones 

 are coarse in texture and highly calcareous, and, like most of the 

 Pennant Grit of this district occurring at a low altitude, have been 

 stained red by the Keuper which once overlay them. The angular 

 discordance is demonstrable in a small exposure at the foot of an ash- 

 tree, half-way down the steep bank between the north-west wall of 

 the churchyard and the road. The Pennant here shows the same 

 dip as in the previous section, and in this case the underlying lime- 

 stone can be clearly seen to dip southward at a larger angle. 

 Although the actual junction is not well defined at any other point, 

 there are numerous very small exposures of both Pennant and 

 Carboniferous Limestone on the northern and western sides of the 

 knoll upon which the church is built ; and apart from its occurrence 

 in the section described, angular discordance is indicated by the 

 dips shown in all these closely adjacent exposures. It is of interest 

 to trace within about 50 yards the gradual passage of the calcareous 

 and highly stained sandstone to the normal blue-grey Pennant 

 Flagstone. On the western side of the church is a deep cutting 

 running to the south and east, in which this change can be followed. 

 Sandstones precisely similar to those seen resting on the limestone 

 close to the churchyard are found to lose their calcareous character 

 and rich staining when they are traced southwards, and, moreover, 

 plant-remains become abundant. 



Western District ( Clevedon Area). 



This district includes the Coal-measures exposed on Strawberry 

 Hill and Court Hill, near Clevedon. The original relation of these 

 to the older rocks has been masked by faulting, which has brought the 

 Coal-measures against the Carboniferous Limestone, and the fault 

 can be traced directly down the steep slopes of the gap which 

 separates the two hills. The faulting is doubtless connected with 

 the profound disturbances that gave rise to the two ridges of 

 Carboniferous Limestone which converge at Clevedon. I hope to 

 continue my investigation of the geological structure of this area. 



YI. — Studies in Edrioasteroidea, VIII. A Comparison with the 

 Structure of Asterozoa. 



By F. A. Bather, M.A., D.Sc, F.E.S. 

 Published by permission of the Trustees of the British Museum. 



11HE resemblance of the oral face of an Edrioasteroid to an Asteroid 

 has not merely been remarked on by nearly every writer on 

 the group, but has led many of them to far-reaching conclusions 

 (e.g. Steinmann, 1888 ; Neumayr, 1889). None the less no exact 

 comparison of the structures has yet been made ; nor indeed was such 

 possible until accurate descriptions were available. These have now 

 been provided for various recent and fossil Asterozoa by many writers 

 referred to in the sequel, and especially by Mr. "W. K. Spencer (1914, 

 " Monogr. Brit. Palseoz. Asterozoa"; Palasontogr. Soc.). 



