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Catalogue of the Blastoidea in the Geological Department of the British Museum (Natural History); With an Account of the Morphology and Systematic ... of the Genera and Species. (Illustrated by 20 - Softcover

 
9781130449341: Catalogue of the Blastoidea in the Geological Department of the British Museum (Natural History); With an Account of the Morphology and Systematic ... of the Genera and Species. (Illustrated by 20
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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. 1886 edition. Excerpt: ...p. 374. Pentatremites Paillettei, Bronn, Klassen und Ordn. Thier-Rcichs, 1860, Bd. ii. t. 23. f. 2a-c. Pentremites Pailletti, Dnjardin & Hupé, Hist. Nat.Zooph.1lchinod. 1862, p. 97, t. 2. f. 13. Pentremites Pailleti, Mallada, Bol. Com. Mapa Geol. Espafia, 1875, tomo ii. p. 78, Ibid. 1877, tomo iv. lam. 12. f. 5, 6. Pentremitidea Pailletti, E. & C., A-nn. & Mag. Nat. Hist. 1882, vol. ix. p. 223. S19. Char. Calyx clove-shaped,' expanding gradually upwards; baselelongate and pointed; summit semitruncate, contracted towards the centre; periphery quinquelobate. Basal plates very long, longer than the radials, forming a slender elongate cup, the surface plane, and without a fold. Radial plates elongate, narrow, strongly arched in the middle line from the lip downwards, but not carinate; bodies occupying by far the greater portions of the plates, the limbs being short and insignificant; sinuses short, wide, open, and with a low radial angle; lips simple, not overhanging. Deltoid plates often invisible externally 2. Ambulacra short, scarcely petaloid, retaining their width undiminished; side plates fifteen, and perhaps more, on each side of an ambulacrum:d'Archiac and de Verneuil say eighteen, transversely oblong; outer side plates unknown. Spiracles very minute, elongated openings separated by the deltoid ridge. Hydrospires eight on each side of an ambulacrum; tubes long; sacs pyriform. Mouth very small. Anal spiracle ovate-triangular, acutely pointed inwards. Orna 1 Ann. & Mag. Nat. Hist. 1882, vol. ix. p. 223, and 1883, vol. xi. p. 226. 9 We have not been able to make out the radio-deltoid sutures at all distinctly in any of our specimens. But Roemer seems to have been more fortunate; and his figures show that...

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  • PublisherRareBooksClub.com
  • Publication date2013
  • ISBN 10 1130449343
  • ISBN 13 9781130449341
  • BindingPaperback
  • Number of pages168

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