Sub-class II. HEMISCHISTA.—Segmentation not complete.
A. Nototropa.—Embryo bent upwards.
Ord. 3. Protura.—The tail is first formed. (Mysis.)
Ord. 3. Saccomorpha.—A maggot-like larva-skin is first formed. (Isopoda.)
B. Gasterotropa.—Embryo bent ventrally.
Ord. 5. Zoëogona.—Full number of limbs not produced in the egg. Zoëa-brood. (The majority of the Podophthalmata.)
Ord. 6. Ametabola.—Full number of limbs produced in the egg. (Astacus, Gecarcinus, Amphipoda less Hyperia ?)
This sample may suffice. The farther we go into details in this direction, the more brilliantly, as may easily be imagined, does the naturalness of such an arrangement as this force itself upon us.
All things considered, we may apply the judgment which Agassiz pronounced upon Darwin’s theory, with far greater justice to the propositions just examined:—“No theory,” says he, “however plausible it may be, can be admitted in science, unless it is supported by facts.”
[1] “A plan fully matured in the beginning and undeviatingly pursued;” or “In the beginning His plan was formed and from it He has never swerved in any particular” (Agassiz and Gould, ‘Principles of Zoology’).
[2] “Deos escrive direito em linhas tortas.” To read this remarkable writing we need the spectacles of Faith, which seldom suit eyes accustomed to the Microscope.