Zoological Record Volume 24

Zoological Record Volume 24

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 edition. Excerpt: ... a retina and a nerve-centre. It evidently compensates for the absence of cephalic eyes in the larval Philine. In Bulla hg/zlatis a similar apparatus is formed, but degenerates before the larva is hatched. Its homology is probably to be sought in a vibratile pit, set on a ganglion at the entrance of thc mantlecavity of aquatic Pulmonata; L.CAzEDUTH1Ens & Pnuvor. Dl: LAGE's paper on the function of otoliths is published in full; his experiments are extended to other groups of animals; ENGELM.N.'. The false gill of the Prosobrrmchiala is considered in general to be n. sensory organ formed by folds of the mantle. richly provided with nervous structures. In some of the higher forms it constitutes a respiratory apparatus, but little less differentiated than the branchial lamellaa themselves; BERNARD (2).-The osphradiurn of C-repidula consists of a central axis, carrying a series of very numerous independent papillaa, each consisting of a narrow stalk and an enlarged tip, and containing a nerve-branch; Osnonx (2, ). Two yellow papill near the anal papill in Arca are covered by long immobile hairs, and their epithelium resembles that of the lateral organ of the Capitellid . These " abdominal sense-organs " are supplied by a nerve from the visceral ganglion: a small ganglion is situated beneath each organ; they are found also in Pectunculus, Auriculidw, Pectinid, and Ostra.icentsIm, but not hitherto in any siphonate Mollnsc; Tn1EI.r: . In the footgland of the Pulmonata, the cells which have been regarded as sensory could not he found, and hence this must not be regarded as a sense-organ; SZEKELY. Sensory cells oshow more

Product details

  • Paperback | 156 pages
  • 189 x 246 x 8mm | 290g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236771338
  • 9781236771339