. Bulletin - United States National Museum. Science. 'it%£:. .5^^ Fig. 189.—Dittopoea colliculata. a, tangential section of a young example, X20, showing the CHAEACTEEISTIC SHAPE OF ZOCECIA AND THE LAEGEE SET OF ACANTHOPOBES; 6, VEETICAL SECTION OF THE SAME SPECIMEN, X20. WASSALEM BEDS (D3), UXNOEM, ESTHONIA. kindly loaned by Doctor Mikhailowski, proves T. pustulifera to be only a form of this same abundant Dittopora, with numerous well- developed acanthopores and a zoarium without conspicuous maculae. To show this identity, a figure of a tangential section prepared from the type is introduced
. Bulletin - United States National Museum. Science. 'it%£:. .5^^ Fig. 189.—Dittopoea colliculata. a, tangential section of a young example, X20, showing the CHAEACTEEISTIC SHAPE OF ZOCECIA AND THE LAEGEE SET OF ACANTHOPOBES; 6, VEETICAL SECTION OF THE SAME SPECIMEN, X20. WASSALEM BEDS (D3), UXNOEM, ESTHONIA. kindly loaned by Doctor Mikhailowski, proves T. pustulifera to be only a form of this same abundant Dittopora, with numerous well- developed acanthopores and a zoarium without conspicuous maculae. To show this identity, a figure of a tangential section prepared from the type is introduced (fig. 190 b). Considering the numerous new species of Trepostomata in the Russian Ordovician, it is odd that this particular form should have received so many names. The following description is believed to cover the essential characters of the species. Zoarium growing from a rounded or somewhat pointed base into straight, cylindrical, rather infrequently dividing branches, var3dng from 3 mm. to 10 mm. or more in diameter. Surface with more or less elongated solid maculae composed of closed mesopores bordered by a row of zocecia slightly larger than the rest. Maculae often transversely elongated to such an extent that frequently several coalesce and form a continuous uncelluliferous band about the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Size: 1420px × 1760px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
