. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 85 Tlie originjil description by DjU'win is jis fyllows: General appearance.—Slioll coiikal, with a rulhor large diamond-shaped orifice, moderately or but little toothed; very Biuooth; walla never folded longitudinally; white, -with au extremely thin pale-yellow persistent epidermis. The radii are very narrow, with their summits very oblique, rounded, and smooth; the epidermis is generally more persistent on the radii than on other parts, and this is exactly the reverse of what is common with B. eburneus. The specimens
. Bulletin - United States National Museum. Science. THE SESSILE BARNACLES. 85 Tlie originjil description by DjU'win is jis fyllows: General appearance.—Slioll coiikal, with a rulhor large diamond-shaped orifice, moderately or but little toothed; very Biuooth; walla never folded longitudinally; white, -with au extremely thin pale-yellow persistent epidermis. The radii are very narrow, with their summits very oblique, rounded, and smooth; the epidermis is generally more persistent on the radii than on other parts, and this is exactly the reverse of what is common with B. eburneus. The specimens from nearly fresh water in the River Plata are brownish and have undergone a remarkable degree of corrosion, the outer lamina of the walla ha^•ing been entirely removed to near the base; hence the external aspect of these specimens is wholly different from ordinary individuals. The var. assimilis has also a very different appearance, owing to the dead white of the walla being relieved by narrow approximate longitudinal hyaline lines, corresponding with and caused by the longitudinal parietal septa being exter- nally visible through the outer lamina of the parietes; the epidermis in the radii ia. 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
