. Bulletin - United States National Museum. Science. I'igs. 19-25.—Pyura pallida (Heller). 19, Left and right sides of body. X .75. 20, Spicules. The long ones are from the mantle, the shout ones from the test. X 15. 21, Part of a spicule. X 225. 22, Tentacle. X 15. 23, Dorsal tubercle and part of dorsal lamina of two individuals. X 9. 24, Hepatic tubules. X 20. 25, Part of gonad. X 4. dorso-ventral diameter may be less than, or may exceed, the length. Size of one of the largest specimens: Length, 45 mm.; dorso-ventral (inclusive of elevation bearing branchial orifice), 52 mm.; lateral diamete
. Bulletin - United States National Museum. Science. I'igs. 19-25.—Pyura pallida (Heller). 19, Left and right sides of body. X .75. 20, Spicules. The long ones are from the mantle, the shout ones from the test. X 15. 21, Part of a spicule. X 225. 22, Tentacle. X 15. 23, Dorsal tubercle and part of dorsal lamina of two individuals. X 9. 24, Hepatic tubules. X 20. 25, Part of gonad. X 4. dorso-ventral diameter may be less than, or may exceed, the length. Size of one of the largest specimens: Length, 45 mm.; dorso-ventral (inclusive of elevation bearing branchial orifice), 52 mm.; lateral diameter, about 15 mm. Apertures nearly 30 mm. apart. Tissues of the mantle (and to a less extent those of some of the other internal structures of the body) containing slender, slightly curved needlelike calcareous spicules, which taper toward one or both ends. They are densely covered with minute appressed spines ar- ranged in rings (fig. 21). All the spines point toward one end of the spicules; this end is not so sharp as the other. The spicules are mostly between mm. and 2 mm. in length, but larger and smaller ones also occur. Similar, but much smaller, and proportionately. 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
