Transactions of the Zoological Society of London Volume 8

Transactions of the Zoological Society of London Volume 8

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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. 1874 edition. Excerpt: ... There are four cycles of them, in six systems. The primary and secondary septa are equal, are higher than the others, and are continued as prominent semicristiform costae down two thirds of the outside of the corallum. The septa of the fourth and fifth orders are nearly as high as the larger ones, and higher than those of the third cycle. The pali are large and rounded, and flat. The columella is small, and is composed of eight processes. The fossa is shallow., The costae are almost equal; but those of the tertiary and quaternary cycles are not prominent like the others, but are_fiat; and all are marked by close transverse rows of granules, separated by transverse grooves. On the round part of the' stem the costal ornamentation is simply granular. Height of corallum % inch; height of calice inch. Dredged up in No. 19, from 248 fathoms, 2nd expedition; No. 28, from 304 fathoms, 2nd expedition. An examination of the great series of Caryoplzylliw which has been obtained during the dredgings, and of a number of forms from shallow water, proves that the shape of the peduncle and base of the corallum varies according to external conditions. To separate the forms which have peduncles attached to foreign bodies from those which are pedunculate but free, and with or without a scar, is not possible, according to the results of the above-mentioned examination, except on the plan of a necessary artificial division of a great and closely allied set of forms. Ceratocyathus, a genus founded by Seguenza to admit pedunculate forms, is thus clearly only a subsection of the Car_1/0plzylliaz; and I propose to absorb it. ' MM. Milne-Edwards and Jules Haime, op. cit. vol. ii. p. 13. There is a very elegant coral which was dredged up from a depth of 705...show more

Product details

  • Paperback | 246 pages
  • 189 x 246 x 13mm | 445g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236973968
  • 9781236973962