. Bulletin - United States National Museum. Science. Pig. 175.—Hemipheagma glabeum. a and &, two fragments, natubal size; c, basal portion of a ZOAEIUM, NATXmAL SIZE; d, TANGENTIAL SECTION, X20, EXHIBITING THICK-WALLED, ANGULAR ZOCECIA AND mesopores; e, vertical SECTION, X20, SHOWING FEWER SEMIDIAPHRAGMS THAN USUAL;/, SEV- ERAL ZOCECLi. OF A TANGENTIAL SECTION, X35, ILLUSTRATING WALL STKUCTtTRE. WaSSALEM BEDS (D3) UXNORM, ESTHONIA. The internal structure of numerous specimens of this well-marked species has been studied and the usual characters are illustrated in figure 175. In figure 175
. Bulletin - United States National Museum. Science. Pig. 175.—Hemipheagma glabeum. a and &, two fragments, natubal size; c, basal portion of a ZOAEIUM, NATXmAL SIZE; d, TANGENTIAL SECTION, X20, EXHIBITING THICK-WALLED, ANGULAR ZOCECIA AND mesopores; e, vertical SECTION, X20, SHOWING FEWER SEMIDIAPHRAGMS THAN USUAL;/, SEV- ERAL ZOCECLi. OF A TANGENTIAL SECTION, X35, ILLUSTRATING WALL STKUCTtTRE. WaSSALEM BEDS (D3) UXNORM, ESTHONIA. The internal structure of numerous specimens of this well-marked species has been studied and the usual characters are illustrated in figure 175. In figure 175 e the semidiaphragms are not as numerous as in other vertical sections while the complete diaphragms are more abundant. It is probable that most of the latter are in reality incom- plete and only appear complete because of the way they are cut by the section. Externally the slender, branching, smooth stems with thick-walled zooecia and mesopores, and internally the strongly crenulated walls of the immature region, and the occurrence of semidiaphragms are characters which will aid in separating the present species from asso-. 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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