Memoirs of the Museum of Comparative Zoology at Harvard College Volume . 46

Memoirs of the Museum of Comparative Zoology at Harvard College Volume . 46

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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. 1917 edition. Excerpt: ... ophicephalous pedicellariae present in the West Indian species but they occur in both the others. Tridentate pedicellariae, rostrate and triphyllous all occur in great numbers but the rostrate are not always clearly separable from the broad tridentate. Calcareous particles in the pedicels are scattered knobbed rods (PI. 145, fig. 20) which in the penicillate pedicels about the mouth become more or less slender perforated plates. Key to the Species of Archaeopneustes. Test of moderate height, v. d. not exceeding.60 length. Mouth distinctly anterior; anterior margin of labium only about.30-.35 test-length from anterior margin of test; test low, v. d. not exceeding half test-length... Mouth less anterior; anterior margin of labium about.40 test-length from anterior margin of test; v. d., .50-.58 test-length Test high; v. d..61-73 test-length; anterior margin of labium about.40 test-length from anterior margin of test Archaeopneustes hystrix. Palaeopneustes hystrix A. Agassiz, 1880. Bull. M. C. Z., 8, p. 82. Archaeopneustes hystrix Gregory, 1892. Quart. Journ. Geol. Soc. London, 48, p. 163. Plate 145, figs. 20-26. The pedicellariae alone remain to be described of this West Indian species. It is rather remarkable that I found no ophicephalous and no globiferous pedicellariae, though the latter are not known in the genus. The triphyllous (PI. hystrix. niasicus. hemingi. 145, fig. 23) have rounded leaf-shaped valves (PL 145, fig. 21) about.12-. 15 mm. long. The tridentate are abundant, of two quite different types which tend to intergrade, though true intermediates are rare. The stout tridentate (or rostrate?) (PL 145, fig. 22) have the valves.40-1.50 mm. long, but little curved and rather abruptly expanded at the tip (PL 145, fig. 26) below..show more

Product details

  • Paperback | 112 pages
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236746260
  • 9781236746269