The Shipley Collection of Scientific Papers Volume 80

The Shipley Collection of Scientific Papers Volume 80

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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. 1898 edition. Excerpt: ...be said to represent a single segment, whereas in the Diplopoda the three anterior pairs of legs are each borne by a single segment, and the character of the mouth parts, which he thought like those of Chilopods except in being rudimentary. As will be seen in the sequel, these difficulties are only superficial, and are much outweighed by the single fact of the similarity in position of the genital apertures. Later writers were more fortunate in their conclusions, but it is to be noted that to them the genus Eur ypauropus was known. The discovery by Packard, in 1871, at Salem, Mass., of a very small Pauropus, to be placed, apparently, between the P. huxleyi and P.pedimrulatus of Lubbock, and Ryder's findingof P. huxleyi at Fairmount Park, Philadelphia, was of great interest, as extending the geographical range of the group and thus indicating ancient origin. There was then some reason for Packard's assumption of its great age when criticising ('70) Haeckel's speculations on the origin of articulates. "And when the type," he says, " became terrestrial we (still speculating) would imagine a form somewhat like the young Pauropus, discovered by Sir John Lubbock in England, which combines in a remarkable degree the characters of the Myriapods and the degraded wingless insects, such as Smynthurus, Podura, etc." But of as much or greater interest as the extension of the range of Pauropux to America was Ryder's discovery, in 1879, of the slow-moving, highly armored Eurypauropus spinosus, which, so far as the peculiarities of segmentation in Pauropus are concerned, at once put to rest all doubt as to the diplopod affinities of the Pauropoda. Here was distinct evidence of the formation of double segments, and, moreover, ...show more

Product details

  • Paperback | 72 pages
  • 189 x 246 x 4mm | 145g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236947932
  • 9781236947932