. Bulletin - United States National Museum. Science. NAT. MUS. BULL. 284 SPRINGER—PLATE 6 LAEX POSTT. EXOC BASOC VOM PARAS PTERSPH SPHEN PROO PTEROT LAEX. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience