. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 6o MARINE BIOLOGICAL LABORATORY. nation of body to head in studying the development of an annelid. Upon this simple plan all annelids are constructed, though they are almost as varied in the details of their orofanization as the vertebrates themselves. The head may be provided with the most elaborate lobes, tentacles, cirrhi, branchiae, eyes, etc. ; or it may lose all of these special organs and become reduced to an insignificant rudiment, as in the earthworm. The trunk is no less diversified ; s
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 6o MARINE BIOLOGICAL LABORATORY. nation of body to head in studying the development of an annelid. Upon this simple plan all annelids are constructed, though they are almost as varied in the details of their orofanization as the vertebrates themselves. The head may be provided with the most elaborate lobes, tentacles, cirrhi, branchiae, eyes, etc. ; or it may lose all of these special organs and become reduced to an insignificant rudiment, as in the earthworm. The trunk is no less diversified ; sometimes a simple jointed cylinder, some- times provided with lateral appendages of the most diverse character in different forms and performing many functions — locomotion of many varieties, respira- tion, sensation, etc. Let us now turn to the development; I select Poly- gordms, a form generally regarded as one of the sim- Vw)\w. 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1890
