. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 241 within. Oral plates small antl so nearly parallel with adorals that the jaw is somewhat rounded and projects very little. Oral papillae four on a side and usually an infradental one at apex of jaw; the papillas are thick and blunt, and the outermost is clearly the largest. First under arm plate very large, somewhat rounded, hexagonal, wider than long; second plate somewhat larger, pentagonal, widest distally; succeeding plates more rounded, soon becoming elliptical and then onger than bro
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 241 within. Oral plates small antl so nearly parallel with adorals that the jaw is somewhat rounded and projects very little. Oral papillae four on a side and usually an infradental one at apex of jaw; the papillas are thick and blunt, and the outermost is clearly the largest. First under arm plate very large, somewhat rounded, hexagonal, wider than long; second plate somewhat larger, pentagonal, widest distally; succeeding plates more rounded, soon becoming elliptical and then onger than broad, and ultimately long pentagonal with distal end rounded; all the under arm plates are more or less separated from. Fig. 115.—Ophiolebes brachygnatha. X 5. a,from above; 6,from below; c,side view of three ARM joints near DISK. each other except the first two. Side arm plates moderate, not meet- ing above and only slightly so below; each plate carries seven or eight stout, blunt arm spines; upper two longest, exceeding joint, smooth; next two similar, but distinctly smaller; lowest three or four very much smaller, somewhat flattened, and with rough tips; they lie more or less appressed to lower surface of arm, pointing distally and in- ward. Tentacle pores small, first pair with a more or less prominent spiniform tentacle scale; a few other pores may have minute tentacle scales, but as a rule the scales are completely replaced functionally by the lowest arm spines. Color (dried from alcohol), light yellowish. 34916°—Bull. 75—11—16. 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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