This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...were protective, it would not be surprising if some of them, hollow and open at the top, were poisonous also, and had glands at the base. These are, however, purely matters of speculation so far. Renal exeretory organs.--Nothing has been seen of any such organs, unless the genal caeca may possibly be of that nature. ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...were protective, it would not be surprising if some of them, hollow and open at the top, were poisonous also, and had glands at the base. These are, however, purely matters of speculation so far. Renal exeretory organs.--Nothing has been seen of any such organs, unless the genal caeca may possibly be of that nature. The main trunks of these always lead to the sides of the anterior glabellar lobe, which is not the point of attachment of either antennae or biramous limbs, so that there seems little chance that they will bear this interpretation. Reproduetive organs.--Nothing is yet positively known about the reproductive organs or the position of their external openings. If the "exites" of Neolenus could be interpreted as brood-pouches, which does not seem probable, then the genital openings were located near the base of some pair of anterior thoracic appendages. The Panderian Organs: Internal Gills or Poison Glands? At a meeting of the Mineralogical Society at St. Petersburg, Volborth (1857) announced that Doctor Pander had two years before discovered certain organs on the lower side of the doublure of the pleural lobes of the thorax of a specimen of Asaphus expansus. These organs were oval openings in the doublure, one near the posterior margin of the cephalon, and one on each thoracic segment of the half-specimen figured by Volborth in 1863. They were explained by Volborth and by Eichwald (1860, 1863) as the points of attachment of appendages. Billings (1870) described and figured the "Panderian organs" of "Asaphus platyeephalus" and stated that he had seen them in Asaphus Ogygites eanadensis and A. megistos Isotehis maximus as well. He thought some sort of organ was attached to them, but could not suggest its function. Woodwa...
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