File:The Eurypterida of New York (1912) (20182998104).jpg

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Title: The Eurypterida of New York
Identifier: CUbiodiversity414805-8540 (find matches)
Year: 1912 (1910s)
Authors: Clarke, John Mason, 1857-1925; Ruedemann, Rudolf, 1864-1956
Subjects: Eurypterida; Paleontology
Publisher: Albany, New York State Education Department
Contributing Library: Cornell University Library
Digitizing Sponsor: Mann Library, Cornell

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THE EURYPTERIDA OF NEW YORK 33 plate, termed the endocranium, plastron or entosternon,' which in its turn forms the fulcrum for other important muscles. Owen has shown that the glabellar furrows, or rather the entapophyses or infoldings to which the furrows correspond, are the bases of the powerful levators of the preab- domen and also of the muscles which serve to steady the entosternon while the latter furnishes the fixed points for the flexors or depressors of the preabdomen and the important muscles that hold and move the coxal joints of the legs.
Text Appearing After Image:
Figure 6 Longitudinal section of Limulus liv, liver; pr^ proventriculus; st, stomach; h!, heart; cp, cartilaginous plate, entosternon; inty intes- tine; a, anus; br, brain. (From Packard) The glabellar furrows of Eur5rpterus thus correspond quite precisely •in position and extension to those of Limulus and the appendages on the ventral side are entirely homologous and of like position and struc- ture; hence it is to be inferred that the same system of muscles existed in Eurypterus as in Limulus, that also Eur3^pterus may have possessed a cartilaginous entosternon and that the glabellar furrows served as bases for the levators of the preabdomen and the lateral levators of the ento- sternon. These furrows are also well developed in species of Stylonurus, asS.cestrotus. ' *The importance of this internal skeleton to the muscular system of Limulus is fully described by Owen (Palaeontographical Society 1878. 32: 187).

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https://www.flickr.com/photos/internetarchivebookimages/20182998104/

Author

Clarke, John Mason, 1857-1925;

Ruedemann, Rudolf, 1864-1956
Permission
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Flickr tags
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  • bookid:CUbiodiversity414805-8540
  • bookyear:1912
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Clarke_John_Mason_1857_1925
  • bookauthor:Ruedemann_Rudolf_1864_1956
  • booksubject:Eurypterida
  • booksubject:Paleontology
  • bookpublisher:Albany_New_York_State_Education_Department
  • bookcontributor:Cornell_University_Library
  • booksponsor:Mann_Library_Cornell
  • bookleafnumber:36
  • bookcollection:cornell
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
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InfoField
23 August 2015

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