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PLATE XXVIII. 



PAGE 



g. 199, a. Section of Volution of Ammonites Newbekryanus. 61 



g. 200. Helicoceras declive. Natural size. 73 



g. 200, a. " " " " 73 



g. 201. Ttjrrilites. Sp. indet. Natural size. 73 



g. 202. Ftrsus aratus. Magnified. 84 



g. 203. Cordiera microptygma. Magnified. 93 



g. 204. Ftrsus Kingii. Natural size. 85 



g. 205. F. Californicus. Natural size. 85 



g. 205, a. Id. Magnified view of the surface. 



g. 206. F. (Hemifusus) Hornii. Natural size. 86 



g. 206, a. Id. Magnified view of the surface. 



g. 207. F. (H.) Cooperii. Natural size. 86 



g. 208. Tritonium Hornii. Magnified. 94 



g. 209. T. paucivaricatum. Magnified. 95 



g. 209, a. Id. Magnified view of body volution. 



g. 210. T. Whitneyi. Natural size. 96 



g. 210, a. Id. Magnified view of body volution. 



g. 211. Buccinum liratum. Natural size. 96 



g. 212. Pseudoliva volut^eformis. Natural size. 99 



g. 213. Fasciolaria sinu^ta. Natural size. 101 



g. 213, a. Id. Magnified view of body volution. 



g. 214. F. Io. Natural size. 101 



g. 215. Mitra cretacea. Magnified. 103 



g. 216. Whitneya ficus. Slightly magnified. 104 



g. 218. Ltjnatia ntjciformis. Natural size. 107 



