. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM—CLARK. 131 40 specimens; Unalaska, 4 specimens; Kyska, 9 to 12 fathoms, 62 specimens; Port Levasheff, Unalaska, 20 to 30 fathoms, 1 specimen; Port Etches, Alaska, 5 specimens; Constantine Harbor, 15 specimens; Unga, 3 specimens; Agattu, 46 specimens; Iliuliuk, 64 specimens; Port Althorp, Alaska, 1 specimen; Chineak Bay, Kadiak, 1 specimen; Medui Island, 2 specimens; Aleutian Islands, 2 specimens; Bering Island, 19 specimens; Shumagin Islands, 1 specimen; Dolgoi Sound, 30 fathoms, 1 specimen; Bay of
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM—CLARK. 131 40 specimens; Unalaska, 4 specimens; Kyska, 9 to 12 fathoms, 62 specimens; Port Levasheff, Unalaska, 20 to 30 fathoms, 1 specimen; Port Etches, Alaska, 5 specimens; Constantine Harbor, 15 specimens; Unga, 3 specimens; Agattu, 46 specimens; Iliuliuk, 64 specimens; Port Althorp, Alaska, 1 specimen; Chineak Bay, Kadiak, 1 specimen; Medui Island, 2 specimens; Aleutian Islands, 2 specimens; Bering Island, 19 specimens; Shumagin Islands, 1 specimen; Dolgoi Sound, 30 fathoms, 1 specimen; Bay of Islands, 8 specimens; Avatscha Bay, Kamtchatka, 1 specimen; 10 miles west of Point Franklin, Alaska, 13^ fathoms, sand, 21 specimens; between Icy Cape and Cape Lisburne, Alaska, 7 specimens; lat. 53° 11' N.; long. 166° 51' W. 84 fathoms, black sand, pebbles, bottom temperature °, 8 speci- mens; Bering Straits, 2 specimens; Sitka, 1 specimen; Alaska, 134 specimens; Arctic Ocean, 1 specimen; Albatross Kydrographic station 1141, off Alaska, 84 fathoms, 8 specimens. Bathymetric range, 9 to 372 fathoms. Temperature range, ° to °. One thousand six hundred and forty-three specimens. These specimens vary greatly in the disk covering, ranging all the way from those with numerous disk plates sepa- rated by lines and bands of nearly spherical granules to those in which the disk is largely covered by coarse spines, and only one or two plates can be distinguished. Many of the speci- mens so grade into japonica that sep- aration from that variety is difficult and arbitrary. As a rule, the supple- fig. 48.—ophiopholis aculeata. I . , FROM ABOVE. mentary upper arm plates are much coarser and more angular than in japonica (compare fig. 48 with fig. 476), and this peculiarity is very noticeable when these Alaskan speci- mens are compared with some from the coast of Maine. The majority of the Alaskan specimens have relatively few large supplementary plates, as in fig. 48, whi
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