Grenville A. J. Cole — Igneous Rocks of Stunner. 219 



Our species has often been confounded with Tereb. perovalis, Sow., 

 and Tereb. Stephani, Davidson. From the first it is easily dis- 

 tinguishable by its larger plications and its carina down the larger 

 valve, but these characteristics unite it with Tereb. Stephani, from 

 which, however, it may be distinguished by a shorter, less incurved 

 beak, and its plications not extending so far up the valves. The 

 characteristic beak ridges as mentioned before are not possessed 

 by either of these other two species. 



Terebratula euides is rather rare. It has been found chiefly in a 

 quarry about two miles from Sherborne, in Dorset, in a sandy bed at 

 the very bottom of the Murchisonias zone, along with Terebratula 

 simplex, Buck., also at one or two other places near Sherborne. It is 

 somewhat variable in width, and the edges of the valves are generally 

 slightly thickened by lines of growth. I take as the type of this 

 species Davidson's figure, Brachiopoda, Pal. Soc, Appendix to 

 Supplement, plate 19, figs. 4, 4a, which are drawn from a specimen 

 in my collection. 



This species is frequently longer and narrower than the speci- 

 men figured by Davidson, sometimes, but rarely, wider. The folds 

 are also slightly variable. 



IV. — The Igneous Bocks of Stanner. 



By Grenville A. J. Cole, F.G.S., 



Demonstrator in the Geological Laboratory, Normal School of Science and Eoyal 



School of Mines. 



THE area near Old Badnor marked by invitingly igneous colouring 

 on Sheet 56 S.E. of the Geological Survey Map deserves atten- 

 tion from more than a petrographic point of view. Murchison, in 

 his " Silurian System," has extolled the charms of the surrounding 

 scenery, and the Bev. W. S. Symonds has repeated this admonition 

 to the tourist. The borderland is in truth here eminently picturesque, 

 from the great escarpment of the Ludlows to the high moor of 

 Badnor Forest, the very stratified deposits yielding singular variety 

 of form. The present paper, however, deals merely with one ridge, 

 called Stanner Bock, comparison being occasionally made with its 

 rival, Hanter Hill, from which it is divided only by a narrow vale. 



Murchison 1 in 1839 compared the masses composing both these 

 hills to the " hypersthene " rocks of Loch Coruisk, and stated that 

 a variety of greenstones and " felspar rock " were also to be found. 

 The differences, indeed, between specimens obtainable within short 

 distances of one another may account for the fact that on the Survey 

 Map Hanter Hill is coloured as syenite and Stanner Bock as green- 

 stone ; whereas Murchison clearly recognized the close relations of 

 the main masses of the two. Dr. Callaway has also touched on the 

 constitution of these hills when dealing with the Pre-Cambrian 

 rocks of Shropshire, 2 and mentions a compact grey felstone as 

 occurring in the centre of the ridge of Stanner Bock. 



It is, indeed, at once apparent when one faces the bold cliff which 



1 Silurian System, p. 318. 2 Quart. Journ. Geol. Soc. vol. xxxv. p. 660. 



