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Memoirs of the Museum of Comparative Zoology, at Harvard College, Cambridge, Mass Volume 34, No. 3

Memoirs of the Museum of Comparative Zoology, at Harvard College, Cambridge, Mass Volume 34, No. 3


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About the Book

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: ...of the test varies much in the different species. This is the largest genus of the family, but although the species show some tendency to an arrangement in three or four groups, we have failed to find any satisfactory characters by which such groups may be constantly distinguished. We can hardly believe that the texture of the test, the relative width of ambulacra and interambulacra, or the relative number of ambulacral and interambulacral plates, are any better generic characters, taken by themselves, than the color or the pedicellariae. And while by using any one of these characters we might arbitrarily establish several " genera," they would intergrade so completely in their other characters, we do not think such subdivisions would be either natural or desirable. Accepting Mortensen's view that A. Reyiwldsii A. Ag. is a synonym of fencstratum Wyv. Thorn., and A. longispinum Yosh. is identical with A. gracile A. Ag., we still recognize 14 species of Araeosoma. They show great diversity in color, texture of the test, distribution of primary spines, relative number of ambulacral and interambulacral plates, relative width of ambulacra and interambulacra, length of spines, and form of pedicellariae; and it is surprisingly hard to distinguish them from each other, for not only do their characters reveal more or less individual diversity, but they intermingle most perplexingly in the different forms. We have reached the conclusion that color is often a good character in this genus, and it proves to be of considerable service in distinguishing certain species. The form of the valves of the large tridentate pedicellariae, which can be easily seen with an ordinary lens, is also a useful character, even if we cannot follow Mortensen in making it generic....


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Product Details
  • ISBN-13: 9781153886703
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 30
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1153886707
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 73 gr


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Memoirs of the Museum of Comparative Zoology, at Harvard College, Cambridge, Mass Volume 34, No. 3
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