Fauna of Baluchistan and N. W. Frontier of India; Vol. I. the Jurassic Fauna

Fauna of Baluchistan and N. W. Frontier of India; Vol. I. the Jurassic Fauna

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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. 1895 edition. Excerpt: ...lanceolate, open at the end, rather long and unequal in size, R the posterior pair being the longest, the odd one the shortest; poriferous zones straight, narrow, composed of small pores. Mouth pentagonal, transversely elongated, surrounded by a large floscelle, the details of which are effaced. Periproct supramarginal, rather large. Ornamentation not visible. Locality and stratigraphical posilz'on, --Mazar Drik, horizon 2a. Remarks.--Although not well preserved, there is no doubt that this specimen belongs to the genus Clypeolampaa. It is easily distinguished from Olypeolampas helios, by its low, rather depressed test, the ratio of height to length being very much smaller. Family: HOLASTERIDE. Subfamily: ANANCHYTIN./E. Genus: HEMIPNEUSTES, Agassiz. 1847. Hemipneustes, Agassiz, Catalogue raisonne dos esp., etc. d'Echinides, Annales des sciences naturelles, oer. iii, Z0oL, Vol.: VIII, page 34. Test suhorbicular or elliptical, slightly truncated behind; upper surface high and inflated or low and depressed, lower surface fiat or slightly convex. Anteal sulcus extending from summit to mouth; broad and fiat at the beginning, narrow and deep near the mouth. Apical disc slightly elongated, composed of four genital plates perforated by large holes, and five smaller ocular plates perforated by minute holes; the right antero-lateral genital plate larger than the other, serves as madrepore plate. Ambulacra open and unequal; the single one, lodged in the anteal sulcus, is composed of extremely fine narrow and equal poriferous zones; pores very small and obliquely arranged in pairs. Lateral ambulacra broad, flush with the test and composed of very unequal poriferous zones; anterior zone very narrow, pores very small, in horizontal pairs, posterior...show more

Product details

  • Paperback | 54 pages
  • 189 x 246 x 3mm | 113g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236861558
  • 9781236861559