. The testimony of the rocks; . liEBIAS OEPHALOTES. Cycloids of Aix. (Miocene.) numerous individually as they are now, were comprised inthe ganoidal and placoidal orders. The period of these HISTORY OF ANIMALS. 95 orders seems to have been nearly correspondent with thereign, in the vegetable kingdom, of the Acrogens and Fipr. PLATAX ALTI8SIMUS. A Ctenoid of Monte Bolca. {Eocene.) Gymnogens, with the intermediate classes, their allies. Atlength, during the ages of the Chalk, the Cycloids and 96 THE PAL^ONTOLOGICAL Otenoids were ushered in, and were gradually developed increation until the
. The testimony of the rocks; . liEBIAS OEPHALOTES. Cycloids of Aix. (Miocene.) numerous individually as they are now, were comprised inthe ganoidal and placoidal orders. The period of these HISTORY OF ANIMALS. 95 orders seems to have been nearly correspondent with thereign, in the vegetable kingdom, of the Acrogens and Fipr. PLATAX ALTI8SIMUS. A Ctenoid of Monte Bolca. {Eocene.) Gymnogens, with the intermediate classes, their allies. Atlength, during the ages of the Chalk, the Cycloids and 96 THE PAL^ONTOLOGICAL Otenoids were ushered in, and were gradually developed increation until the human period, in which they seem tohave reached their culminating point, and now many timesexceed in number and importance all other fishes. We donot see a sturgeon (our British representative of theganoids) once in a twelvemonth ; and though the skate anddog-fish (our representatives of the placoids) are greatly lessrare, their number bears but a small proportion to that ofthe fishes belonging to the two prevaihng orders, of whichthousands of boat-loads are landed on our coasts every all but entire disappearance of the ganoids fromcreation is surely a curious and not unsuggestive circum-stance. In the human family there are races that have longsince reached their culminating point, and are now eitherfast disappear
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