. A manual of zoology. Zoology. Fig. 324. Fig. 325. Pro. 321.—Oral areaof crii]oicl(.4ii(erfo)i), showing bj- dotted lines the course of the in- testine from the mouth (m) to the anus ('/); ;y, ciliated grooves leading from the arms to the mouth (orig.). Fig. —Cross-section of pinnula of AulfOon. (After Ludwig.) a, axial nerve cord; c, ciliated cups; c, c, coeliac canal; g, gonad; s, sacculi; .sc, subtentacular canal; (, teatRclcs. liere have no suckers nor ampulla and are merely tactile tentacles. A typical stone canal is also lacking; in its place are five or several liundred tubules le
. A manual of zoology. Zoology. Fig. 324. Fig. 325. Pro. 321.—Oral areaof crii]oicl(.4ii(erfo)i), showing bj- dotted lines the course of the in- testine from the mouth (m) to the anus ('/); ;y, ciliated grooves leading from the arms to the mouth (orig.). Fig. —Cross-section of pinnula of AulfOon. (After Ludwig.) a, axial nerve cord; c, ciliated cups; c, c, coeliac canal; g, gonad; s, sacculi; .sc, subtentacular canal; (, teatRclcs. liere have no suckers nor ampulla and are merely tactile tentacles. A typical stone canal is also lacking; in its place are five or several liundred tubules leading from the ring canal to the coiloni. Oj)\m- site their ccelomic mouths are fine pores in the oral disc through which water enters to pass through the tubules into the ambulacral system. Tlie ambulacra! nervous system is weakly develojjed. The enteroccele system, on the other hand, is well developed and forms the axial cord running through the brachialia and radialia to unite in a ring in the centrodorsal. A pn-oblematical organ, the so-called dorsal organ, also begins in the centrodorsal and extends up through the axis of the tlieca to the oral disc. It is possibly a lymphoid gland, j)0ssibly a structure for the transfer of nutriment, and is aj^parently homologous with the ' heart' of the 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
Size: 1112px × 2248px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
