. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 51 herewith reveal some of these notable variations; figs, lld-f arc from a specimen having the disk 7 mm. in diameter, while figs. lla-c are from a much larger specimen, with a disk 11 mm. across. A number of the specimens are labeled "Ophioglypha rohusta (Ayrcs)," but this is clearly an error. I have not yet seen a specimen of rohusta from Bering Sea or the North Pacific. It is rather remark- able that neither Grieg'' nor Meissner^ mention this species, although both writers in th
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 51 herewith reveal some of these notable variations; figs, lld-f arc from a specimen having the disk 7 mm. in diameter, while figs. lla-c are from a much larger specimen, with a disk 11 mm. across. A number of the specimens are labeled "Ophioglypha rohusta (Ayrcs)," but this is clearly an error. I have not yet seen a specimen of rohusta from Bering Sea or the North Pacific. It is rather remark- able that neither Grieg'' nor Meissner^ mention this species, although both writers in their bibliographies refer to Ludwig's paper. OPHIURA LEPTOCTENIA, new Disk 11 mm. in diameter; arms about 30 mm. k)ng. Disk flat and more or less circular, covered by a close coat of two or three hun- dred scales, among which the centrodorsal is easily distinguishable, though it is seldom so large as in fig. 12a; one radial plate just proximal to or between radial shields is commonly larger than the other disk scales. Radial shields large, longer than wide, some- times wholly separated, but usually in contact distally, inner sides nearly or quite straight, but more or less strongly diverging. Basal upper arm plates tetrago- nal, with edges more or less curved, much wider than long; near middle of arm they are about as long as âophiuraleptocteni.\. xs. a,from above; 6,from wide, and at tip they are ^^"°'^'='' '"^^ ^'^^^ ""' ^''"^ â '^'' '^'^"' ""^^^ ''''''â very much longer than wide and are nearly triangular; in contact with each other whole length of arm. Interbrachial spaces below closely covered with numerous small scales. Oral shields much longer than wide, with a broad proximal angle and a curved distal margin. Adoral plates and oral plates well marked and about of a size. Oral papillse numerous, six or more on a side, narrow and sharp. Teeth narrow and pointed. Genital slits conspicuous, reaching from oral shie
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