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Studies from the Biological Laboratory (Volume 3)

Studies from the Biological Laboratory (Volume 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. 1887. Excerpt: ... LIPE HISTORY OP THALASSEMA. By H. W. CONN, Instructor in Biology at Wesleyan University. With Plates XX, XXI, XXII and XXIII. The relation of Gephyreans to other group9 of worms is a question which has undergone considerable discussion, and one in regard to which there has been much difference of opinion. Indeed it has been questioned whether they are worms at all; not a few naturalists having regarded them as related to the Echinoderms. They have been looked upon as having affinities with the Turbellarian worms and the Rotifers. Within a few years, however, it has been recognized that they are to be classed with the Annelids. At least this is true in regard to Oephyrea armata, including Echiurus, Thalassema and Bonellia. The relation of the adult to the annelid has been for some time recognized, but it remained for Hatschek1 to show that their development was entirely upon the annelid type. Our knowledge of the development of the group has been, however, rather meager, and is confined entirely to the later stages. Kowalevsky2 indeed states that Thalassema has a regular segmentation and an invaginate gastrnla, but beyond this nothing of the early stages is known. The observations on the early stages here to be described are supplementary to those already made and fill up a gap which existed in our knowledge of the embryology of the group. With these observations we have a nearly complete history of Thalassema and Echiurus from the first appearance of the ova and spermatozoa in the peritoneal lining of the bodycavity, to the adult individual. The observations here embodied were made at the marine laboratory of the Johns Hopkins University, at Beaufort, being completed during the summer of 1884. The Thalassema found at Beaufort is an undescribed species, to...


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Product Details
  • ISBN-13: 9781235682346
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 170
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 123568234X
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 313 gr


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