SHELLS OF THE LOWER SILURIAN ROCKS. 



641 



Terebratula neglecta, PI. 21. f. 14. Orbicular ? convex, plaited ; plaits 17, acute; beaks small. 

 A fragment. 



Loc. Mandinam, Llandovery. 

 Terebratula tripartita, PL 21. f. 15. Transversely oval ? convex, plaited; plaits 15 or 20, rugose, 



often forked ; middle much elevated so as to divide the surface into 3 nearly equal parts. 



Length \ inch ; width 1 inch 2 lines. 



Loc. Goleugoed, Llandovery. 

 Terebratula decemplicata, PI. 21. f. 17. Nearly globose, plaited; plaits 10, angular, two of them 



greatly elevated in the front ; beaks small, pointed. Length 4 lines ; width 4r| lines. 



Loc. Bransill Castle, Eastnor Park; Ankerdine Hill; May Hill; Frescoed Common, 



Usk ; Hill JEnd Farm, Longmynd. 

 Terebratula pusilla, PI. 21. f. 18. Nearly globose, plaited; plaits about 14, sharp, 4 of them elevated 



in the front. Length and width nearly 4 lines. 



Loc. Cefn Rhyddan, Llandovery . 

 Pentamerus Icevis, PI. 19. f. 9. (Min. Con., v. 1. p. 76*. t. 28.) The general outline of this 



shell is nearly orbicular; it is very convex and smooth. The upper or flatter valve is not so 



perfectly divided into 3 cells as in the Pent. Knightii. But the division in the other valve is 



always very conspicuous. Length about 1 inch ; width about lj inch, or sometimes larger. 



Loc. The Hollies near Hope Bo wdler, Buildwas ; Old Storridge Hill, Worcester; Castell 

 craig-gwyddon, Llandovery ; Michaelivood Chase, Tortworth. 

 Pentamerus oblongus, PI. 19. f. 10. Oblong-oval, depressed, smooth; a few shallow longitudinal 



furrows are sometimes observable, especially two in the lower (larger) valve, the beak of which 



is produced. Length 2| inches ; width 2\ inches. 



Occurs with P. Icevis in the upper beds of the Caradoc formation. The edges of the valves 



are waved by the shallow furrows without deviating from the same plane. 



Loc. The Hollies, Soudley and Nor bury, Salop ; Castell craig-gwyddon, Llandovery. 

 Lingula attenuata, PI. 22. f. 13. Depressed, smooth; front rounded; sides nearly straight; at- 

 tenuated towards the apex. Length *J\ lines ; width 5 lines. 



Loc. Bormgton and Meadow Toivn, Salop ; Golden Grove, Caermarthenshire. 

 Euomphalus tenuistriatus, PI. 22. f. 14. Discoid, whorls few, round, rapidly increasing in size, 



crossed by numerous regular strise ; aperture round, equal in diameter to half the width of the 



shell. Diameter about 4| lines. 



Loc. Middleton, Comdon Hills. 

 Euomphalus perturbatus, PI. 22. f. 15. Discoid, whorls 3 or 4 rounded, smooth. Diameter about 



1 inch. 



So much are all the specimens distorted, that our description is necessarily meagre. 

 Loc. Pensarn, Caermarthen. 



Euomphalus Corndensis, PI. 22. f. 16. Discoid, smooth, whorls about 3, ventricose ; aperture 

 transversely oval. Diameter 2^ lines, f. 16 a. is magnified. (In Volcanic Grit.) 

 Loc. Leigh Hall, at the Northern extremity of the Comdon Hills. 



Euomphalus funatus, PI. 12. f. 20. Ranges from the Aymestry Limestone to the Caradoc Sand- 

 stone. 



Loc. Golden Grove ; Middleton, Comdon Hills ; Old Storridge Hill, Worcester. 

 Pleurotomaria angulata, PI. 21. f. 20. A cast of rather more than one whorl, from which it ap- 

 pears to have been a conical shell with angular whorls, and probably a striated surface ; the 



