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250 AMERICAN GEOLOGY. Orthis disparilis 194 “ perverta, 194 “ fissicosta, 195 “ insculpta, ;..... 195 “ dicliotoma, 195 “ subquadrata, 195 “ occidentals, 195 “ sinuata, 196 “ subjugata, 196 “ sequivalvis, 196 “ lynx, 196 “ bellarugosa 197 Orthocerata, 148 Ortlioceras, 148 “ primigenius, 148 “ laquecatum, 149 “ rectiangulatum,.... 149 “ subarcuatus, 149 “ bilineatus, 149 “ teretiformis, 149 “ arcuolitatum, 149 “ textile, 150 “ clathratum, 150 “ anellus, 150 “ undulostriatus,...;. 150 “ amplieameratus, ... 150 “ multioameratus,... . 150 “ strigatus,....; 150 Ormocerte 150 Orthonota parallela, 173 “ pholadis, 174 “ contracta, 174 Ortliis eostalis, 235 Orthis, 185 Orthisina, 186 Potericrinus alteanatus, 224 Ptilodictya ramosa, 205 “ labyrinthica, 205 “ elegantula, 205 “ recta, 204 Palieochorda marina, 103 “ tenuis, 103 Palaeozoa, 142 Pentamerus 148 Periploma planulata, 172 Perturbations earth’s caust,.... 4 Phacops calliceplialus 214 Phytopsis tubuloscum, 232 Plants, 231 159 “ lenticularis, .... 160 “ subconica, 160 11 quadricarinata,.. 160 “ percarinata, 160 “ turgida, 160 “ umbilicata, 160 “ varieosa, 161 “ nodulosa, 161 “ antiquata, 161 u rotuloides, 161 “ indenta, . 161 “ ambigua, . 161 “ umbillicata, .... . 161 Pleurotamaria, 233 “ subtilistriata, .. . 233 “ percarinata, 233 Porcelia omata, . 167 Posidonomya bellistriata,, . 176 “ orbicularis . 176 “ subundata, . 177 “ amygdalina,.... . 177 . 177 Peteropoda, . 207 Quantity of rain, 7-8 Quartz and its associates, . 53 , 159 11 porphyry, . 160 Radiata, . 221 Receptaculites neptune, . 230 “ circularis, 230 Review of opinions, etc., . 69 Rocks, comp. Taconic system, . 8-17 Roofing slate, . 39 “ Iloosick .. 40 Rhinchonelidae, . 181