. The chordates. Chordata. Fig. 285. Diagrams showing structural similarity of a coelenterate and a gastrula. (A) Hydra, longitudinal section. (B) Gas- trula, axial section. (A) Archenteron, pro- spective digestive cavity; (BP) blastopore; (E) enteric (digestive) cavity; (EC) ecto- derm; (EN) endoderm; (M) mouth; (T) tentacle. (Courtesy, Neal and Band: "Chor- date Anatomy," Philadelphia, The Blakiston Company.) transitory pharyngeal clefts, aortic arches, and notochords would seem to be open to no more reason- able explanation than that they are due to long-range inheritance. Of the
. The chordates. Chordata. Fig. 285. Diagrams showing structural similarity of a coelenterate and a gastrula. (A) Hydra, longitudinal section. (B) Gas- trula, axial section. (A) Archenteron, pro- spective digestive cavity; (BP) blastopore; (E) enteric (digestive) cavity; (EC) ecto- derm; (EN) endoderm; (M) mouth; (T) tentacle. (Courtesy, Neal and Band: "Chor- date Anatomy," Philadelphia, The Blakiston Company.) transitory pharyngeal clefts, aortic arches, and notochords would seem to be open to no more reason- able explanation than that they are due to long-range inheritance. Of the two indispensable allies of Comparative Anatomy, Em- bryology owed its rapid advance in the latter part of the nineteenth century largely to F. M. Balfour (1851-82) in England and, in Ger- many, to Wilhelm His and, a little later, Oskar Hertwig. In America, the work of Louis Agassiz (1807- 73: Harvard University; founder of the Museum of Comparative Zo- ology) on the embryology of the turtle was of permanent signifi- Fig. 286. Louis Agassiz (1807-73). cance. Outstanding figures in the last two decades of the century were W. K. Brooks (Johns Hopkins University), C. S. Minot. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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