362 Dr. C. Callaway — Metamovplne Area in S/irojJshire. 



A simple subovate Estheria, with broad interspaces between the 

 concentric lines of growth, destitute of any visible interlinear 

 sculpture. It is from the Lower-Carboniferous rocks at Horton. 

 Length 5 mm., height 3 mm. 



Some specimens from Scotland, thought to be referable to E. 

 Dawsoni, were figured and described in 1878 (loc.cit.). These have 

 the posterior dorsal angle of the valves strongly pronounced. This 

 feature is not clearly indicated by the lines of growth on the broken 

 specimen from Horton ; and we hope to have better examples to 

 show whether or no the Scotch form is actually the same as that from 

 Nova Scotia. 



10. — Leaia Leidyi, var. Salteriana, Jones. Plate XIL Fig. 13. 



Zeaia Leidyi, var. Salteriana, Jones, Monogr. Foss. Estherise, Pal. Soc. 1862, p. 



119, pi. i. fig. 21. 

 leaia Leidyi, Dawson, Acadian Geology, 1868, p. 256, fig. 78e. 

 Leaia Leidyi, Jones, Gkol. Mag. Vol. VII. 1870, p. 219, PL IX. Fig. 11. 



This is the subquadrate form of Leaia, which is found in Wales 

 and elsewhere in association with the more oblong and other varieties. 

 We have not yet seen our way to define them as distinct species 

 (see Geol. Mag. loc cit.). It is about 6 mm. long, by 4 mm. _ From 

 Horton. 



EXPLANATION OF PLATE XII. 

 (All the figures except Figs. 12 and 13, are magnified about 25 diameters.) 



Fig. 1 and 2. Leperditia Okeni, Miinst., var. Scotoburdigalensis. a, left valve ;. 5, 

 edge view ; c, end view. 2, left valve. Lower Coal- 

 measures, Horton. 



,, 3. Leperditia OJteni, Miinst. Left valve. Lower Coal-measures, Horton. 



,, 4. Leperditia Okeni, ^'ax. acuta, a, nghtyalMe; 5, edge view. Coal-measures, 

 Joggins. 



,, 6. JBeyrichiaNova-Scotica, s^.n. Right valve. Lower Coal-measures, Horton. 



,, 6. BeyrichiaNova-Scotica, s'^.n.. Left valve. Lower Coal-measures, Horton. 



,, 7. Frimitia or BeyricMa, sp, indet. Left valve. Lower Coal-measures, 

 Horton. 



,, 8. Carbonia? bairdioides, Jones and Kirkby, a, left valve; b, ventral view; 

 c, dorsal view ; d, end view. Coal-measures, Joggins. 



,, 9. Carbonia fabuUna, J. ScK. \a,v. humilis. «, right valve ; 5, both valves ; c, 

 ventral view ; d, dorsal view ; e, end view. Coal-measures, 

 Joggins. 



,, 10. Candona elongata, sp. nov. Valve. Coal-measures, Joggins. 



,, 11. C?/i!/;ere ? sp. indet. a, 5, c, side views of different valves. 



,, 12. Estheria liawsoni, Jones. Left valve, magnified five times. 



,, 13. Leaia Leidyi, var. Left valve, magnified five times. 



YII. — On a new Metamorphio Area in Shropshire. 

 By C. Callaway, D.Sc., F.G.S. 



THE occurrence of two Arch^an groups ' in Shropshire is now 

 well known to geologists. The chain of hills which strikes to 

 the south-west from Lilleshall, north-east of Wellington, to the 

 region south of Church-Stretton, is mainly composed of bedded 

 volcanic rocks ; but gneissic and granitoid types have been recog- 

 nized at the Ercal and at Primrose Hill, the elevations forming the 

 opposite extremities of the Wrekin, and a small exposure was 

 detected near Hope Bowdler, east of Church-Stretton. A second'^ 

 1 Quart. Journ. Geol. Soc. Nov. 1879. 2 Ibid. May, 1882. 



