EXPLANATION OF THE PLATES AND WOODCUTS. 



Fig. 16. Section of the slate quarries of Nordberg near Goslar. In this cut are represented the 

 independence of bedding, cleavage and joints. The undulating lines indicate the bedding, 

 the oblique the cleavage, and the horizontal the peculiar joints or floors. At the junction 

 with the flanking masses of trap the slate is much altered : p 290. 



PLATES XXV. to XXXVIL 



Illustrate the description of the Devonian fossils of the Rhenish provinces, &c., by Viscount 

 'Archiac and M. de Verneuil : p. 303. 



Plate XXV. 



Fig. 1, a, b. Goniatites Noeggerathii : p. 337- 



Fig. 2, a, b. retrorsus : p. 338. 



Fig. 3. id. jun. 



Fig. 4, 5. id. var. a and b : p. 338. 



Fig. 6, a, b. Goniatites cancellatus : p. 339. 



Fig. 7, Oj b. Hoeninghausii : p. 339. 



Fig. 8, a, b. paucistriatus : p. 339. 



Plate XXVI. 



Fig. l,a,b. Goniatites Buchii : p. 340. 



Fig. 2, a. ib. var. p. 340. 



Fig. 3, a, b. costulatus: p. 341. 



Fig. 4, a, b. tuberculosus : p. 342. 



Fig. 5, a. latestriatus : p. 341. 



Fig. 6, a. Goniatites incertus : p. 342. 



Fig. 'J, a, b. tenuistriatus: p. 343. 



Fig. 8, a. id. jun. 



Fig. 9. Aptychus vetustus : p. 343. 



Fig. 1, a. Orthoceratites triangularis : p. 347. 



Fig. 2. regularis : p. 344. 



Fig. 3. Wissenbachii : p.345. 



Plate XXVII. 



Fig. 4. Orthoceratites gracilis : p. 344. 



Fig. 5, a. ■ striolatus : p. 345. 



Fig. 6. anguliferus : p. 346. 



Plate XXVIII. 



Fig. 1, a. Orthoceratites Dannenbergi : 



p. 345. 

 Fig. 2, a. ■ subfusiformis 



Fig. 3, a. 



p. 347. 



subpyriformis 



p. 347. 



Pig. 4, a, b. Cyrthoceratites lamellosus: p.348. 



Fig. 5, a, b. ornatus : p. 349. 



Fig. 6. BeUerophon striatus : p. 353. 



Fig. 7, a, b. Murchisonii : p. 353. 



Fig. 8. id. var.: p. 353. 



Fig. 9. tuberculatus : p. 353. 



Plate XXIX. 



Mg. 1, a. Cyrthoceratites depressus : p. 350. 

 Fig. 2, a. BeUerophon elegans : p. 354. 

 Fig. 3. Conularia Gervillii: p. 351. 



Fig. 4, a, b, c. Conularia GerviUii : p. 35 1. 

 Fig. 5, a. ornata : p. 352. 



