. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. Fig. 25. —Astaciis fluviatiUs.—The central Dervous Bystem seen from above (nat. size), a, vent; an, antennary nerve ; a'n, antennulary nerve; t, circumoesophageal oommissTires ; gn. 1, supracEsophageal ganglion; gn. 2, infraoesophageal ganglion ; gn. 6, fifth thoracic ganglion ; gn. 7, last thoracic ganglion ; gn. 13, last abdominal gang- lion ; ceg, oesopha-gus in cross section; on, optic nerve; sa, sternal artery in cross section ; sgn, atomatogastric Pleas

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. An introduction to the study of zoology : by T. H. Huxley, F. R. S. ; with eighty-two illustrations. Crayfish; Zoology. Fig. 25. —Astaciis fluviatiUs.—The central Dervous Bystem seen from above (nat. size), a, vent; an, antennary nerve ; a'n, antennulary nerve; t, circumoesophageal oommissTires ; gn. 1, supracEsophageal ganglion; gn. 2, infraoesophageal ganglion ; gn. 6, fifth thoracic ganglion ; gn. 7, last thoracic ganglion ; gn. 13, last abdominal gang- lion ; ceg, oesopha-gus in cross section; on, optic nerve; sa, sternal artery in cross section ; sgn, atomatogastric 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 Huxley, Thomas Henry, 1825-1895; Huxley, Thomas Henry, 1825-1895. Crayfish. New York : D. Appleton

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1901