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But more perfect specimens enabled Professor Owen, in 1858, to show that this fossil animal was a Saurian reptile, which probably fed on shell-bearing mollusks, and used its short and flat teeth, so thickly coated with enamel, for pounding and crushing the shells. Voltzia heterophylla. Portion of same magnified to show fructification. Sulzbad.
On the other hand, it is true that in the Lower Cambrian not even the shell-bearing tetrabranchiates have yet been discovered.
How well warranted are we therefore in identifying the latter with the former. Equally scanty is our knowledge of the developmental history of the Ostracoda. The development of Cypris has recently been observed by Claus: "The youngest stages are shell-bearing Nauplius-forms." The section of the Branchiopoda includes two groups differing even in their development, the Phyllopoda and the Cladocera.
Reasons for studying the newer Groups first. Nomenclature of Formations. Detached Tertiary Formations scattered over Europe. Value of the Shell-bearing Mollusca in Classification. Classification of Tertiary Strata. Eocene, Miocene, and Pliocene Terms explained.
It will be observed that in the foregoing allusions to organic remains, the testacea or the shell-bearing mollusca are selected as the most useful and convenient class for the purposes of general classification. In the first place, they are more universally distributed through strata of every age than any other organic bodies.
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