EXPLANATION OF THE PLATES AND WOODCUTS. 



PLATE XXXIX. 



Illustrates Mr. Owen's memoir on remains of a Bird, a Tortoise, and Lizard from the Chalk of 



Kent and Cambridgeshire : p. 411-413. 

 Fig. 1. Portion of the shaft of the humerus of a longipennate bird : p. 411. 

 Fig. 1 a. Outline of its transverse section at the distal end: p. 411. 

 Fig. 2. Distal extremity of the tibia of probably the same bird: p. 411. 

 Fig. 3. Side-view of a portion of the lower jaw of the Lacertian reptile from the lower chalk 



near Cambridge : p. 413. 

 Fig. 3 a. Under view of the same jaw : p. 413. 

 Fig. 3 b. Upper view of part of the alveolar series, showing the circular section of the teeth a 



and b, and the incomplete alveolus at c. The adjoining figure gives an internal view of 



the alveoli and their outer plate : p. 413. 

 Fig. 4. The vertebral column of the Lacertian from the lower chalk in Kent: p. 412. 

 Fig. 5. Portions of the Chelone Benstedi from the lower chalk in Kent: p. 412. 



PLATE XL. 



Map of part of South America to illustrate Mr. Darwin's memoir on the distribution of the 

 Erratic Boulders and on the contemporaneous unstratified deposits of South America: p.415. 



WOODCUTS, 



Fig. I. Section of the strata composing the districts adjacent to the Santa Cruz river, lat. 50° 

 10' south: p. 416. 



Fig. 2. Section in Gregory Bay at the eastern part of the Strait of Magellan. It exhibits con- 

 torted beds of black mud, which gradually pass into yellow sandy mud: p. 422. 



Mg. 3. Section also in Gregory Bay. It displays singular contortions in the subordinate 

 layers of one of the strata : p. 423. 



PLATES XLL and XLIL 



Map and Sections to illustrate Mr. Austen's memoir on the South-east of Devonshire: p. 433 — 489. 



Plate XLIL 



Fig. 1. Coast sections from Hope's Nose to Petit Tor: p. 441, p. 449 et seq., likewise p. 461 

 and p. 462 et seq., also p. 470 et seq. 



Fig. 2. Section from the granite south of Moreton Hampstead, to the high road between New- 

 ton Bushel and Totness : p. 449 et seq., also p. 457 ^i ^^Q-} and p. 462 et seq., also p. 471. 



Fig. 3. Section from West Ogwell to the greensand and tertiary beds east of Newton Quarry : 

 p. 449 et seq. also p. 457 et seq., and p. 462 et seq., likewise p. 470 et seq. 



Fig. 4. Section, near Totness, of trap resting on limestone and slate : p. 472. 



Fig. 5. Coast-section near Dawlish, exhibiting the faults in the new red sandstone : pp.483, 486. 



Fig. 6. Section of the unconformable position of the carbonaceous deposits to the lower rocks 

 near Chudleigh; and of the intrusive trap: pp. 458, 460, 472. 



