On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under ... During the Years 1838-1842 (Classic Reprint) - Brossura

Dana, James Dwight

 
9781334307850: On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under ... During the Years 1838-1842 (Classic Reprint)

Sinossi

Excerpt from On the Classification and Geographical Distribution of Crustacea: From the Report on Crustacea of the United States Exploring Expedition, Under Captain Charles Wilkes, U. S. N., During the Years 1838-1842

This centre, as we have observed in another place, is properly between the second antennae and mandibles. The second antennae and the rudimentary mouth, are among the first parts that appear in the embryo. If we look at it as a centre of force or of growth, we remark that the radii on opposite sides of this centre, before and behind, are very unequal, the latter being six or eight times as long as the former, - a relation which is the. Inverse of the functional importance of the parts pertaining to each.

Our idea of the condition of highest centralization is thus drawn from a study of the species.

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