Memoirs of the Museum of Comparative Zoology at Harvard College Volume 38

Memoirs of the Museum of Comparative Zoology at Harvard College Volume 38

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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. 1911 edition. Excerpt: ...somatocyst is of the "Amphiroa" type, consisting of a descending sac, and two more slender diverging canals; and the former, seen in side view, is curved upward sharply near its free end. A comparison between it and the various figures of Ceratocymba (Bedot: 04, Lens and Van Riemsdijk: 08) as well as with the "Albatross" specimens of the latter (Plate 16, fig. 3, 4) shows that the resemblance between the two, in so far as this character is concerned, is an extremely close one. The general form of the bract is not yet sufficiently advanced to show its final outline, but its large descending scale-like portion resembles in its general form and proportions the corresponding region in Ceratocymba. It is already divided into three facets, a dorsal, and two laterals, and of the latter the right hand one is already the larger, a character which foreshadows the asymmetry of the bract in the free "Ceratocymba" Eudoxid. The apical portion of the bract, still divided for the passage of the stem, corresponds to the dorsal facet of the latter. As to the arrangement of its ridges nothing can yet be said. There are two gonophores, one well developed (apparently cf), one still merely a bud. The larger is proportionately very broad; but the basal tooth and particularly the pronounced serrations of the hydroecial wings suggest the conditions in the corresponding regions in Ceratocymba (Bedot: 04, pl. 1, fig. 1). The siphon has a well-developed basigaster, but neither it, nor the tentacle, shows any features of special interest. The tentilla are of the ordinary Abylid type. On the whole, the resemblance of the cormidium to Ceratocymba is so close that I have no hesitation in identifying the latter as the free Eudoxid of Abyla...show more

Product details

  • Paperback | 162 pages
  • 189 x 246 x 9mm | 299g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236846117
  • 9781236846112