Index to Vols. I — IX. 



33 



Relation of mollusks to shells, 



vi, 2 



Remarks on the Genus Pteroto- 



crinus, L. & C, ii, 3. 



Remarks on the Trenton Lime- 

 stone of Kentucky, with descrip- 

 tions of new fossils from that for- 

 mation, and the Kaskaskisi 

 (Chester) Group, Sub-carbonifer- 

 ous, iii, 144. 



Some notes on American land 



shells, iii, 33; iv, 323. 



Trenton Rocks at High Bridge, 



Kentucky, iii, 72 (See Mickle- 

 borougii and Wetherby.) 



Whitewater, Winter Birds on the, v, 



54- 

 Whitfield, R. P. Remarks on some 

 lamellibranchiate shells of tlie H ud- 

 soii River Group, with 'ie^cripttons 

 of four new species, i, 137 



Whitney, J. D. On Climatic Changes 



of Later Geological Times — no- 

 ticed — V, 77. 

 Wisconsin, Drift of, iv, 210, 221. 

 Wren, Long-billed Marsh, Nest of, 



iii, 222. 

 Xenocrinnus penicillatus, S. A. M.* 



iv, 72, 176. 

 Xylophaga (?) mississippien^is, Mr. 



and Aid.* ix, (46) no. 

 Yellowstone, Jurassic and Triassic in, 



ii, 155. 

 Young, D. S., M.D., on Black E^ass, 



vii, 95 

 Zeiller, M. R. On Impressions of 



Insects resembling plants. (See 



James, J. F , viii, 49. ) 

 Zonites, iv, 326, 331. (See Helix.) 

 Zoological Miscellany, iv, 336; v, 51, 



89, 185; ix, 261; X, 49, 147, 214. 

 Zygospira concentrica, Ul * ii, 14. 



