Natural Gas Developments in New York State for the Periodto

Natural Gas Developments in New York State for the Periodto

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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. 1909 edition. Excerpt: ...occurring in the New York formations. Other results of significance are the recognition of the genus Drepanopterus; the identity of the eye structure of Pterygotus with that of Limulus shown by the presence of an outer smooth thick cornea which is separable from an inner layer of lenses; the demonstration that the chelicerae of Pterygotus consist of long unjointed arms carrying the terminal pincers; and the close relationship of the genera Stylonurus and Dolichopterus brought out by transitional forms and the identity of new structures observed in their New York representatives. The genus Stylonurus is resolved into three subdivisions for which the subgeneric terms Stylonurus sensu stricto, Ctenopterus and Homalopterus are introduced. These divisions are based mainly on the character of the legs. The genus Hughmilleria has been shown to agree in the structure of its compound eyes with Eurypterus, although the position of these suggests a closer relationship to Pterygotus. The Cambric genus Strabops possesses the full complement of 12 dorsal segments instead of 11, as hitherto supposed, and has small compound eyes placed far back and near the lateral margin. The investigation of the larval forms of a number of Siluric species has shown that some of these pass through a stage identical in its most important features with the adult Cambric Strabops. The ontogeny of Eurypterids is for the first time investigated and the development of species of the genera Eurypterus, Eusarcus, Hughmilleria, Pterygotus and Stylonurus is traced as far back as the nepionic or larval stage, and a number of larval characters are established which appear to be common to all and of significance in phylogenetic relation. Both the restorations of the genera and the...show more

Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236604180
  • 9781236604187