. Bulletin - United States National Museum. Science. 120 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. bearing the branchial aperture at the end. Atrial aperture but slightly prominent, situated some distance back on the dorsal border. Attachment by a large part of the left side. Test yellowish, very smooth and shiny externally (much more so than in Phallusia de- pressiuscula, just described), and of a glassy transparency and fairly firm consistency. Apertures lobed, but in their contracted state the lobes can not readily be counted. Length, 38 mm.; dorsoventral diameter, 25 mm.; thickness from
. Bulletin - United States National Museum. Science. 120 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. bearing the branchial aperture at the end. Atrial aperture but slightly prominent, situated some distance back on the dorsal border. Attachment by a large part of the left side. Test yellowish, very smooth and shiny externally (much more so than in Phallusia de- pressiuscula, just described), and of a glassy transparency and fairly firm consistency. Apertures lobed, but in their contracted state the lobes can not readily be counted. Length, 38 mm.; dorsoventral diameter, 25 mm.; thickness from side to side, about 10 mm. Mantle thin and transparent, its musculature slight, comprising slender radiating and circular bands on and near the tubes, and scattered transverse bands on the right side in the ventral region, but over most parts of the body no bands are noticeable. After removal from the test a few minute bright red ocelli are visible around the margin of the apertures. Eleven were counted about the branchial aperture; the number about the atrial aperture was not determined. Tentacles of three sizes arranged with some approach to regularity; a few additional fourth-order ten- tacles are also present, and the total number can hardly be less than 50. Dorsal tubercle with an orifice of irregular horseshoe form; its open interval directed forward. Dorsal lamina nearly or quite plain-edged in the anterior part; but in the posterior part cleft into numerous long narrow teeth, some of them dividing into two or three slender points. Branchial sac in structure and appearance much like that of Phallusia depressiuscula just described. (See fig. 74.) Transverse vessels of two (in some parts three) orders fairly regularly arranged, with occasional much larger vessels at intervals which are not always in accord with the usual scheme of arrangement. Minute plications of the sac well developed; they are less numerous than (in some places only half as numerous as) the internal lo
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
