IT. Silurian and Old Red in 8. Staffofdshire. 485 



The only Brachiopoda, we find, in E* and E'' are Zitiffulcs. 

 Mr. Lightbody at Ludlow "found L. Leivisii in the Upper Ludlow 

 Series, but rarely ; and near the top of that series abundance of another 

 form, rather smaller, which he would be disposed to regard as 

 L. Lewisii if that species had not been so rare in the Upper 

 Ludlow".^ A Eurypterid from E'' kindly examined by Dr. Bather 

 is, he thinks, probably Eurypterus pygmceus {^'dMer). 



At the basin section, Saltwells, E'^ is crowded with Lingulce as 

 large as --^o by -^q of an inch, which are identical in form with 

 L. Lewisii, but are much smaller than the L. Leivisii that occur in 

 the Ayraestry Limestone. They continue to the top of E*. 



In E'' a still smaller form of L. Lewisii is common, two of which 

 measure \l by -/q- and ^% by -gV- There are also Linyidce 

 which are rotund, for the two sides are not, as in L. Lewisii ?a\di 

 L. cornea, fairly straight, but bulge out in a marked and distinctive 

 manner. They are like those figured as L. Sytiiondsihj Mr. Davidson 

 in the British Silurian Brachiopoda, pi. iii, figs. 8, 9. L. Symotidsi, 

 so far as we are aware, has not, however, before been recorded at such 

 a high horizon. Our specimens, out of E^, gradually diminish in 

 size and become elongated. The smallest and most elongated correspond 

 with Mr. Davidson's dimensions and description of L. minima. 



In South Staffordshire Lingula Lewisii, in its smaller forms, reaches 

 E'', which is a higher horizon than is recorded in the Ludlow district. 

 Also Orhiculoidea rugata, which at Ludlow is rare in D'', is found 

 at Saltwells in E'= ; and R. nucula and 0. elegantula occur in D^^. 



3. Temexide or Euryfterus Shales (see Fig. 4). — The magnificent 

 section at Brewins Tunnel continues, at the same dip, uninterruptedly 

 thus : — 



ft. in. 

 /Yellow- white quartzitie sandstone with black markings . .19 

 j Purple and green shales. L. minima, L. cornea, and 



EurypteridEe . . . . . . . . .30 



J Eusty-red marly sandstones. L. cornea . ... . .39 



F^ \ Light green-yellow soft sandstones. L . cornea and minwna . 10 3 

 Eubbly green shales and marls with some micaceous purple 

 I shales. L. cornea, Eurypteridas, Cephalaspis Murchisoni, 

 ^ Onchus, L. ininima, etc. . . . . . . .50 



[Bone-bed limestone. L. cornea and many fragments of 



F"^ \ EurypteridsB 4 



( Green shales . ... . . . . . . .35 



-pj f Flaggy sandstones . . . . . . . . .20 



^ "lEedshale 6 



F"^ Bone-bed limestone. L. cornea and many fragments of 



Eurypteridse .......... 4 



{ Green shale .......... 4J 



F« - Calcareous yellow-green micaceous grit ..... 1§ 



( Green shale .......... 2 6 



F'' Calcareous yellow-green micaceous grit. L. cornea ... 2 



33 6 



The two calcareous yellow-green grits are similar to the beds which 

 occur in the vicinity of a bone-bed limestone where it passes either 



■^ The Silurian Brachiopoda, pp. 35, 36. 



