. Bulletin - United States National Museum. Science. PACIFIC TUNICATA OF NATIONAL MUSEUM 29. Figure 4.—Aplidium yezoense, new species: a, one of the colonies; b, zooid with minute thorax; c, intestinal loop; d, section of stomach. several zooids. Distal portion of cormidium where thoraces of zooids are embedded somewhat soft in consistency as compared with basal half. Zooids may reach about 9 mm. in length. Thorax missing in most zooids or very small when it exists. Colonies probably in resting stage when all old thoraces are torn down and new ones are in process of regeneration. Eight st
. Bulletin - United States National Museum. Science. PACIFIC TUNICATA OF NATIONAL MUSEUM 29. Figure 4.—Aplidium yezoense, new species: a, one of the colonies; b, zooid with minute thorax; c, intestinal loop; d, section of stomach. several zooids. Distal portion of cormidium where thoraces of zooids are embedded somewhat soft in consistency as compared with basal half. Zooids may reach about 9 mm. in length. Thorax missing in most zooids or very small when it exists. Colonies probably in resting stage when all old thoraces are torn down and new ones are in process of regeneration. Eight stigmatal rows ? Both abdomen and postab- domen filled compactly with mesenchyme cells; postabdomen much longer than abdomen. Intestinal loop may reach 4 mm. in length. Stomach considerably wider than long with 4 longitudinal plications on surface, situated at level of posterior one-third of length of intes- tinal loop. Hind stomach distinct; middle intestine occupies pos- terior end of intestinal loop and is marked with a few irregular longi- tudinal folds. Proximal portion of rectum swollen distinctly at level of posterior margin of stomach forming a pair of roundish caeca. Gonads not found in zooids examined. Remarks.—In Amaroucium fragile Redikorzev, 1927, from the Okhotsk Sea, the colony consists of many cormidia, the zooids are provided with 10-11 stigmatal rows and the stomach with 4-5 longitu- dinal plications. These features somewhat resemble those of the. 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.
Size: 1688px × 1481px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
