An Introduction to the Study of the Comparative Anatomy of Animals volume 2
An Introduction to the Study of the Comparative Anatomy of Animals volume 2
Bourne, Gilbert Charles, 1861-
The book An Introduction to the Study of the Comparative Anatomy of Animals volume 2 was written by author Bourne, Gilbert Charles, 1861- Here you can read free online of An Introduction to the Study of the Comparative Anatomy of Animals volume 2 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to the Study of the Comparative Anatomy of Animals volume 2 a good or bad book?
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34 A. Ventral view of an egg of Astacus in an early stage of development, cp, optic lobes ; En. P, endoderm plate ; Tk. Ab, thoraco-abdominal plate. B. Sagittal section through a slightly older egg. Bl, blastopore ; EC, epiblast ; En, hypo- blast ; mes, mesoblast. C. Ventral view of the so-called nauplius stage. Ai, first antenna; As, second antenna; An, anus; G. Op, optic ganglion; L6, labrum ; Md, mandible. D. Sagittal section through an embryo of nearly the same age as C. Ettt, enteron ; Prc..., proctodaeum ; st, commencement of the stomodaeum ; other letters as before. E, Ventral view of a more advanced embryo; the thoraco-abdominal rudiment. Th. Ab, is well developed and turned forwards ; E, eyes. F. Sagittal section through an embryo of the same age as E. Ht, heart ; Spg, supraoesophageal ganglion ; other lettering as before. It should be noticed that the yolk has been entirely absorbed by the hypoblast cells lining the enteron, so that the latter resemble the yolk-pyramids of the earlier stage, shown in fig.
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