. Bulletin - United States National Museum. Science. PACIFIC TUNICATA OF NATIONAL MUSEUM 73. â ^"^-^ ' t^ CI Figure 23.âDidemnum (Didemnum) siphonale, new species: a, central part of colony showing common cloacal aperture; b, finger-shaped prominences on surface of some colonies; c, spicules, X 1800; d, schema showing the section of colony; e, right side of a zooid, X 100. abdominal layer; thus abdomens of one to a few zooids are almost entirely surrounded by lacunae, as in species of the genus Le-ptoclmum (fig. 23d^). Zooids large; thorax about 450/a in a strongly contracted state,
. Bulletin - United States National Museum. Science. PACIFIC TUNICATA OF NATIONAL MUSEUM 73. â ^"^-^ ' t^ CI Figure 23.âDidemnum (Didemnum) siphonale, new species: a, central part of colony showing common cloacal aperture; b, finger-shaped prominences on surface of some colonies; c, spicules, X 1800; d, schema showing the section of colony; e, right side of a zooid, X 100. abdominal layer; thus abdomens of one to a few zooids are almost entirely surrounded by lacunae, as in species of the genus Le-ptoclmum (fig. 23d^). Zooids large; thorax about 450/a in a strongly contracted state, abdomen about 700/a in lengtli. Retractile muscle of moderate length. A small roundish thoracic organ is found near posteroventral corner of tlio widely opened atrial aperture on each side. About 10 (?) longitudinal muscles on each side of thorax. Branchial aperture 6-lobed, stigmatal rows 4, about 8 stigmata in each row. Two testicu- lar follicles, proximal portion of vas deferens coils G-7 times. Remarks.âThe existence of finger-shaped prominences on the sur- face of some colonies, small spicules and large zooids reminds us of Dideinnurrh {Didemnum) apersum Tokioka, 1953, from Sagami 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
