. Annual report. New York State Museum; Science; Science. REPORT OF THE STATE PALEONTOLOGIST I9O3 309 e<ss esJ^ zontal position has changed to a vertical one. A horizontal section through the block containing this turn has been made and the rock polished down sufficiently to expose the turn []. Figure 5 shows the front of the next block, which is identical with the posterior section of figure 4. Here the endosiphuncle has become a very nar- row cylindric tube (endosiphotube) sharply limited by a black con- chiolinous wall. It lies somewhat laterally to a broad, dark gray brown belt of
. Annual report. New York State Museum; Science; Science. REPORT OF THE STATE PALEONTOLOGIST I9O3 309 e<ss esJ^ zontal position has changed to a vertical one. A horizontal section through the block containing this turn has been made and the rock polished down sufficiently to expose the turn []. Figure 5 shows the front of the next block, which is identical with the posterior section of figure 4. Here the endosiphuncle has become a very nar- row cylindric tube (endosiphotube) sharply limited by a black con- chiolinous wall. It lies somewhat laterally to a broad, dark gray brown belt of organic lime carbonate, through which the walls of the large crystals of the siphuncle fill- ing pass, though retaining the organic coloring matter in its original distribution. A split is noticeable in the upper part, as if the band here consisted of two lamellae. Text figure 10 repre- sents this condition of the endo- siphuncle. The endosiphotube is now the only remaining organ with distinct conchiolinous walls and the endosiphocoleon is re- duced to a dark band of organic lime carbonate, a transverse median line of which indicates Its former composition of two amellae. On the other side of the block [, mm farther posteriorly] to show the relation of the wings M to the . endosiphosheaths [ess]. Endosiohocoleon cut the endosiphotube has retamed through major axis the same diameter as in the preceding section, though its shape has changed from circular to semicylindric; the endosiphocoleon has not diminished in size, but has become considerably lighter in color and more indistinct in outline, specially in the middle part, while the ends have remained colored slighth^ stronger and are wider so that the section assumes somew^hat the shape of a dumb-bell. The median line, observed in the preceding section, has disappeared, but there remain two darker spots in the center of the end balls. Fig. 14 Diagrammatic section of siphuncle elat. Please note that these images are ext
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
