Proceedings of the American Academy of Arts and Sciences Volume . 14

Proceedings of the American Academy of Arts and Sciences Volume . 14

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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. 1879 edition. Excerpt: ...205, 1,050 fathoms; Station 332, 245 fathoms. Phormosoma tenuis, A. Ag., nov. sp. Closely allied to Phormosoma uranus, W. Th., from which it differs mainly in having larger and more numerous primary tubercles, especially on the actinal side, while on the abactinal side the small number of miliaries occurring in this species give it a very different facies. The coronal plates are more numerous in P. uranus than in specimens of the same size of this species, and the abactinal system is also proportionally smaller in P. tenuis, and the anal system made up of larger plates.--Station 274, 2,750 fathoms; Station 237, 1,875 fathoms. Prionechinus sagittiger, A. Ag., nov. gen. & sp. The apical system of this genus is similar to that of Salmacidae. Single row of plates of pores on each side of median ambulacral line. Actinal membrane covered by plates. Spines serrated, somewhat flattened, radically different from those of any other genus of Triplechinidae. As is well known, the serrations of the spines of young Echini proper disappear with age, and it is only among the Cidarid, Salenidae, and the like, that we find spines greatly differing in allied genera or species, the spines of the Echinidae proper being remarkable for their uniformity. Unfortunately only indifferently preserved specimens of this interesting genus were collected, and they are probably not fully grown, as the large anal system is still covered by a few large plates, as in all young Echini. Genital plates of uniform size; ocular plates notched in apex, excluded from anal system.--Station 164, 950 fathoms; Station 218, 1,070 fathoms. Cottaldia Forbesiana, A. Ag., nov. sp. There is only a single specimen of this interesting species (probably not full grown). It is closely allied to the...show more

Product details

  • Paperback | 134 pages
  • 189 x 246 x 7mm | 254g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236499565
  • 9781236499561