EXPLANATION OF THE PLATES. 

 PLATE XLL 



Illustrates Dr. Buckland's memoir on Fossil Bones of the Iguanodon found in the Iron 

 Sand of the Wealden Formation in the Isle of Wight and Isle of Purbeck : p. 425. 



Plate XLIL 



Map to illustrate Mr. R. C. Taylor's account of a part of the Mineral Basin of South 

 Wales, in the vicinity of Pontypool. The portion of the Map coloured represents 

 the mountain limestone ; the portion uncoloured, the coal measures : p. 433. 



PLATE XLIIL to XLVL 



Illustrate Mr. Clift's memoir on the Megatherium: p. 437. 



Plate XLIIL 



A copy of a portion of a Manuscript Map in the possession of Woodbine Parish, Jun., Esq., 

 which comprehends that part of Spanish America in which those Remains of the Me- 

 gatherium which have hitherto been sent to Europe were chiefly discovered. 



No. 1. Denotes the situation on the River Lujan (or Luxan) whence the bones were de- 

 rived which were sent to Spain in 1789 by the Marquis of Loreto, and from which 

 were constructed the Skeleton of the Megatherium now preserved in the Royal Ca- 

 binet of Natural History at Madrid, described and figured by Don Juan Bautista 

 Bru, and published by Don Joseph Garriga, under the title '■^ Descripcion del Esque- 

 leto de un Qiiadrupedo imiy corpxdento y raro" Madrid, 1796: — and by Messrs. Pander 

 and D' Alton under the name of " Das liiesen-Faulthier, Bradypus gigantciis" Bonn, 

 1821. 



No. 2. Rincon de Sosa, (situated in the southern part of the Map,) the property of Don 

 Hilario Sosa, on the banks of the River Salado, the spot on which were discovered 

 the Bones which form the subject of the present paper. Not any portion of Shell or 

 Cuirass was found at this spot. 



No. 3. The lake Las Averias, at which locality was found the most perfect example of the 

 Cuirass, imbedded in a stratum of hard clay, at about four feet below the upper sur- 

 face, together with some bones, which were exposed to view by the occasional beating 

 of the waters against the sides of the Lake in stormy weather. The shell, when first 

 discovered, (according to the assurances of the Peons, or country people, who accom- 

 panied the person sent by Mr. Parish to the spot,) was at least twelve feet in length, 

 and from four to six feet in the widest or deepest part. The Bones on being taken 

 out of the earth almost immediately mouldered away. A fragment of the pelvis was 

 all that reached Buenos Ayres. The Skeleton was said to have appeared to be as 

 large as that found at Senor Sosa's. 



An external and internal view of a small but characteristic fragment of this Shell 

 or Cuirass is given in Plate LXVI. 



