Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 580 TEILOBITES OF UPPER CAMBRIAN. [Oh. XXYII. tween 1400 and 1500 species from the same Silurian and primordial rocks of Bohemia.* In the primordial zone he discovered trilobites of the genera Paradoxides, Conocephalus (Conocoryplie), Ellipsocephalus, Sao, Ario- nellus, Hydrocephalus, and Agnostus. These primordial trilobites have a j>eculiar facies of their own dependent on the multiplication of thek thoracic se
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 580 TEILOBITES OF UPPER CAMBRIAN. [Oh. XXYII. tween 1400 and 1500 species from the same Silurian and primordial rocks of Bohemia.* In the primordial zone he discovered trilobites of the genera Paradoxides, Conocephalus (Conocoryplie), Ellipsocephalus, Sao, Ario- nellus, Hydrocephalus, and Agnostus. These primordial trilobites have a j>eculiar facies of their own dependent on the multiplication of thek thoracic segments and the diminution of their caudal shield or pygidium. One of the ' primordial' or Upper Cambrian Trilobites of the genus Sao, a form not found as yet elsewhere in the world, has afforded M. Barrande a fine illustration of the metamorphosis of these creatures, for he has traced them through no less than twenty stages of their development. A few of these changes have been selected for representation in the accompanying figures, that the Fossils of the lowest Fossiliferous Beds in Bohemia, or ' Primordial Zone ' of Barrande. Fig. 66T.
Size: 1035px × 1933px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
