. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIUEANS IN NATIONAL MUSEUM CLARK, 235 OPHIACANTHA LEUCOSTICTA, new ; Disk 17 mm. in diameter; arms about 70 mm. long. Disk covered with a thin, uncalcified skin, which appears to be speckled with both black and white; examination with a lens shows that the black spots are due to organic tissue on the inner surface of the skin, while the white spots are due to minute, elongated calcareous granules; these granules are borne by plates which for the most' part have a diameter scarcely exceeding that of the granules,
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIUEANS IN NATIONAL MUSEUM CLARK, 235 OPHIACANTHA LEUCOSTICTA, new ; Disk 17 mm. in diameter; arms about 70 mm. long. Disk covered with a thin, uncalcified skin, which appears to be speckled with both black and white; examination with a lens shows that the black spots are due to organic tissue on the inner surface of the skin, while the white spots are due to minute, elongated calcareous granules; these granules are borne by plates which for the most' part have a diameter scarcely exceeding that of the granules, but around the radial shields they are developed into ordinary overlapping scales. Radial sliields rather large, distinctly separated, the distal half exposed but bearing on the outer margin one or more elongated granules. Upper arm plates rounded, hexagonal, or elliptical, much wider than long, more. Fig. 111.—OPHIACANTHA LEUCOSTICTA. X :?. 0, FROM ABOVE; 1), FROM BELOW; C, THREE ARM JOINTS NEAR MIDDLE OF ABM, SEEN FROM BELOW; (l, SIDE VIEW OF TWO ARM JOINTS NEAR DISK. or less in contact with each other, at least on basal })art of arm. Interbrachiul space below like disk above. Genital slits large. Oral shields somewhat rhombic, twice as wide as long. Adoral plates moderate, short and wide, hardly meeting within. Oral ])apin8e tlu'ee on a side, broad, flat, rounded. Teeth very large and con- spicuous. First under arm plate hexagonal, about as long as wdde; succeeding plates more or less octagonal and longer than broad, but rapidly becoming hexagonal, tetragonal, or rounded and much wider than long; the first two or tlirce are in contact, but the succeeding plates appear to be separated by a depression; whether the side arm plates meet in this depression, or whether it is a proximal pro- « AeuKoaziKToc, signifying white-spotted, in roference to the appearance of the dit^ Please note that these images are extracted from scanned page images that may have been digitally enha
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
