INDEX. 



911 



Wodnika striatula, 372. 



Wolf, 504, 505, 518, 562,564, 



568, 571, 577. 

 Wood, composition of, 361. 



decomposition of, 362. 

 Woodpecker, 503, 510. 

 Woodville sandstone, 377. 

 Woodward, on Atrypa, 171. 

 Woolhope limestone, 244. 

 Woolwich beds, 512. 

 Worm-holes in Potsdam beds, 



168. 

 Worniley, analyses of coals, 



316, 317. 

 Worms, 122, § 123, § 333, 342, 

 475, 592, 596 

 number of Silurian, 249. 

 range of, in time, 387.* 

 Worthen, A II., on rocks of 

 Illinois, 294, 374, 378, 783. 

 Illinois Devonian, 256. 

 oil in the Niagara, 222. 

 Writing slate, 69. § 

 Wurtemberg, salt-works in, 



424. 

 Wurtz, on metamorphic heat, 

 762. 

 Albertite and Grahamite, 

 315. 



Wyman, J , on fossil man, 578. 

 Wyoming, Canadian in, 182. 



Carboniferous in, 293 



Cretaceous in, 454, 456. 



geysers in, 750. 



Lignites in, 457 



Subcarboniferousin, 296. 



Tertiary in, 491, 493. 



Xanthidia, 257,* 471. 

 Xenoneura antiquorum, 274. 

 Xiphodon, 517, § 519. 



gracilis, 519. 

 Xylobius Dawsoni, 342. 



fractus, 342. 



similis, 342. 



Sigillarige, 334,* 342, 350. 

 Xylophaga, first of, 477. 



Yellowstone National Park, 

 611, 708, 750. 



River, in the Cretaceous, 479. 

 Yoldia, 303, 468. 



Arctica, 562. 



glacialis, 553, 559. 



impressa, 510. 



limatula, 495, 500,* 510. 

 Yorktown period, 490, 494. 

 Yosemite valley, 453. 



Ypresian group, 512. 

 Yucca, 450. 



Zamia, 514. 



Zaniires graminioides, 407,* 

 409. 



megalophylla, 436,* 450. 

 Zaphrentis, 240, 243, 256. 



bilateralis, 224 * 228. 



Canadensis, 204. 



gigantea, 256, 259,* 261. 



Rafinesquii,259,* 261. 



Stokesi, 206. 

 Zeacrinus, 303, 341. 



elegans, 298,* 303. 

 Zechstein, 369. 

 Zeolites, 77, 186, 418. 



formed in a brick wall at 

 Plombie>es, 777. 



origin of, 777. 

 Zeuglodon, 494. 



cetoides, 502,* 503, 509. 

 Zinc-ores, 186, 197. 

 Ziphacodon rugatus, 510. 

 Zircon-syenyte, 73 § 

 Zizyphus hyperboreus, 498. 

 Zones of depth, for oceanio 



species, 611. 

 Zygobates, 510. 



