. A text-book of invertebrate morphology. Invertebrates. TYPE M0LLU8CA. 277 of the body there is a special thickening of the muscle-tissue to form a "foot" (Fig. 122, p), which assumes a great'variety of forms, and special muscles are developed for its protrac-. FiQ. 123. gpe P zl ^ 7 Diagrams showing the Abbangement of the Organs in an . Ideal MolLUSK (after Lankestek). a = tentacle. i = ctenidium. ft = head. k = reproductive pore. c = margin of mantle I = nephridial pore. d = margin of shell. m = anus. e = edge of body. n and p —• foot. /= edge of shell depression. r = coelom. g =
. A text-book of invertebrate morphology. Invertebrates. TYPE M0LLU8CA. 277 of the body there is a special thickening of the muscle-tissue to form a "foot" (Fig. 122, p), which assumes a great'variety of forms, and special muscles are developed for its protrac-. FiQ. 123. gpe P zl ^ 7 Diagrams showing the Abbangement of the Organs in an . Ideal MolLUSK (after Lankestek). a = tentacle. i = ctenidium. ft = head. k = reproductive pore. c = margin of mantle I = nephridial pore. d = margin of shell. m = anus. e = edge of body. n and p —• foot. /= edge of shell depression. r = coelom. g = shell. s = pericardium. gc = cerebral ganglion. t = testis. gpe = pedal ganglion. u = nephridium. gpl = pleural ganglion. o — ventricle of heart. h = osphradium. zl = liver. tion or retraction when this is necessary, as well as for the closure of the shell in those forms (Pelecypoda) in which it is a bilateral structure. The coelom is in some forms a relatively spacious cavity, traversed, however, even in these cases by thin bands of con-. 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 McMurrich, J. Playfair (James Playfair), 1859-1939. New York, H. Holt and Company
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1894
