Contributions from the United States National Herbarium Volume 10

Contributions from the United States National Herbarium Volume 10

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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. 1908 edition. Excerpt: ... within one-fifth of the radius from the margin, then rapidly decreasing to the margin; no dots or puncta within the hexagons; interradial lines frequent toward the margin; border a thin hyaline band; outline uniformly irregular by depression of one side. Diameter of valve from 0.138x0.109 mm. to 0.080x0.071 mm. Type in the U. S. National Museum, No. 590120, from station 2807, Galapagos Islands, April 4, 1888; 812 fathoms, bottom of Globigerina ooze and coral mud; collected also at station 3013H, Hawaiian Islands. This form is not to be confused with the irregular, generalfy subtriangular examples of C. heteroporu Ehrenb., classed as C. decrescent irregularis Grun." The far greater delicacy of the network, the absence of papillae, and the uniformity in the hexagons over the greater part of the valve, clearly distinguishing them. It is very abundant at both the above stations, the first of which is close to the Galapagos Islands and the second close to the Hawaiian Islands. This unusual form must therefore be looked upon as a subtropical littoral species. Coscinodiscus denarius Schmidt, Atlas pi. 57. f. 19-22. 1878. Ratt. Proc. Roy. Soc. Edinb. 16: 504. 1889. De Toni, Syll. Alg. 2: 1238. 1894. Coscinodiscus variolatus Castr. Rep. Voy. Chall. Bot. 2: 155. pi. 2.J. 5. 1886. It is doubtful if this has sufficient specific difference from C. symmetricus Grev. to warrant the above name. It is certainly not sufficiently different from the figures so named by Schmidt. Compare also Greville's original figure.c Found at station 3097. off central California. Coscinodiscus elegans Grev. Trans. Micr. Soc. Lond. n. s. 14: 3. pi. l.f. 6. I860. Schmidt, Atlas pi. 68. f. 7, pi. 163. f. 10. 1878. Pant. Beitr. Bacill. Ung. 1: 73. pi. 16. f. Ul (?), pi. 24. f....show more

Product details

  • Paperback | 274 pages
  • 189 x 246 x 15mm | 494g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236613082
  • 9781236613080