. Bulletin - United States National Museum. Science. Fig. 113.—Leptotetpa hexagonalis. a, tangential section of the American type op the species, X20; THE LAEGER ZOOECIA FORM PART OF A MACULA, WHILE THE MORE NUMEROUS, SMALLER CELLS ARE OF THE ORDINARY INTERMACULAR KIND; &, SEVERAL ZOCECIA OF THE SAME SECTION, X30, SHOWING THEIR SEHPLiaTY OF STRUCTURE; C, VERTICAL SECTION, X20, EXHIBITING BOTH REGIONS OF THE THIN ZOARIAL LAYER. MIDDLE OEDOVICIAN (PLATTEVILLE) LIMESTONE, MlNEEAL POINT, WISCONSIN. zooBcia are wanting entirely in this area which undoubtedly repre- sents similar thickwalled, me
. Bulletin - United States National Museum. Science. Fig. 113.—Leptotetpa hexagonalis. a, tangential section of the American type op the species, X20; THE LAEGER ZOOECIA FORM PART OF A MACULA, WHILE THE MORE NUMEROUS, SMALLER CELLS ARE OF THE ORDINARY INTERMACULAR KIND; &, SEVERAL ZOCECIA OF THE SAME SECTION, X30, SHOWING THEIR SEHPLiaTY OF STRUCTURE; C, VERTICAL SECTION, X20, EXHIBITING BOTH REGIONS OF THE THIN ZOARIAL LAYER. MIDDLE OEDOVICIAN (PLATTEVILLE) LIMESTONE, MlNEEAL POINT, WISCONSIN. zooBcia are wanting entirely in this area which undoubtedly repre- sents similar thickwalled, mesopored areas at the base of the zoa- rium in such forms as Diplotrypa Mcornis. The subject of such areas of small cells is discussed on a previous page, where it is suggested. Fig. 114.—Leptotrypa hexagonalis. a, tangentiae section, X20, op a Russian example; 6, ver- tical SECTION, X20; C, A vertical section, X20, PASSING THROUGH A LAYER OF ORDINAEY ZOCECU, AND ALSO CUTTING THE CLOSELY TABULATED, MESOPORE-LIKE TUBES GROWING UPON THE FLAT SIDE OP THE shell; d, TANGENTIAL SECTION, X20, THEOUGH THE SMALL, THICK-WALLED CELLS. KUCKEES SHALE (C2), Baron Toll's estate, Esthonxa. that the HyolitJies shell frequently or invariably rested upon its flat side in the mud of the sea bottom. The internal structure is so simple that specific mention of it is hardly necessary. The strong acanthopores spoken of in the original. 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.
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