632 FAUNAL SUCCESSION OF THE UPPER BERNICIAN 



very large quantity in the Woodend Limestone as well as in 

 other Lower Bernician beds, but I have not found the species 

 in the limestones between the Fell Top Limestone and the 

 beds of the lower group. A piece of the carbonized remains 

 of a plant occurred in a thick post of limestone in Crossedge 

 quarry, Newton, near Corbridge. 



VII. 

 DESCRIPTION OF CERTAIN CORALS AND BRACHIOPODS. 



CORALS. 



Clisiophyllids.* 



Dibunophylluiii Vaughan. — Form cylindrical. Central 

 area bisected by flexuous plate not specially thickened. The 

 lamellae are irregular and flexuous, and extend from the 

 boundary of the area to the plate, with which they frequently 

 inosculate. External area : very short minor septa and very 

 open loose vesicles. No marked peripheral area, since all the 

 septa extend almost or quite to the wall. The narrow 

 cylindrical form from the Redesdale Limestone is probably 

 this species, but the specimens obtained were badly preserved. 

 The Dibunophylluiii from the Redesdale Shale is a variant 

 in which the mesial plate is difficult to trace, and in which 

 the lamellae inosculate. 



In certain forms of Dibunophylluiii muirheadi from Scremer- 

 ston the vesicles of the external area are loose ; these forms 

 approach near to Dibunophylluin 6, but differ in the greater 

 or less shortening of the lamellae so that they do not reach 

 the mesial plate. 



Dibtmophylluin muirheadi and the var. D. spleiideiis, char- 

 acteristic of the Dryburn Limestone, are large and cylindrical. 

 The central area is on the plan of Dibunophylluin 6, but the 

 vesicles are much more closely packed, especially in the case 

 of D. splendens. The central area is completely bisected by 

 a mesial plate, but the lamellae which extend inwards from the 

 boundary of the area do not usually reach the plate (a stage 

 towards Aspidophyllum), 



* Notes on the Clisiopliyllids by Dr. Vauglian, 



