. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 139 joint. Tentacle pores on first arm joint very laro:e, protected by- two scales; succeeding pores less conspicuous, protected by a single large, oval scale. Color (dried from alcohol), light brown. Locality.—Albatross station? "No label in jar, Nov. ; Type.—C&t. No. 25638, This little specimen is doubtless still young, but the unusual com- bination of six arms, short radial shields, elliptical upper arm plates, long tetragonal under arm plates and four short arm
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 139 joint. Tentacle pores on first arm joint very laro:e, protected by- two scales; succeeding pores less conspicuous, protected by a single large, oval scale. Color (dried from alcohol), light brown. Locality.—Albatross station? "No label in jar, Nov. ; Type.—C&t. No. 25638, This little specimen is doubtless still young, but the unusual com- bination of six arms, short radial shields, elliptical upper arm plates, long tetragonal under arm plates and four short arm spines distinguish it from any other known Ophiactis. It is a great pity that there is no clue to the locality of this interesting species. OPHIACTIS GYMNOCHORA, new species, a Disk 5 mm. in diameter; arms about 30 mm. long. Disk cov- ered by about two hundred small scales, which, along the margin, carry little spines. Radial shields long and narrow, separated witiiin but in contact distally. Arms six, remarkably stout in proportion. Fig. 54.—Ophiactis gymnochora. x 10. a, from above; 6, from below; c, -side view of three ARM joints near DISK. to the size of disk. Upper arm plates broadly hexagonal or heptag- onal, much wider than long, in contact throughout; many are broken into two or more pieces. Interbrachial spaces below quite bare, save for scales alongside the genital slits, which are rather large. Oral shields rounded without and pointed within, about as wide as long. Adoral shields narrow within and much broader at outer end, not meeting either radially or interradially. Oral piij)illce two or three on a side, large, flat, rounded at tip. First inider arui plate small, triangular; succeeding plates much larger, more or less octag- onal, nearly or quite as long as wide, broadly in contact throughout. Side arm plates rather small, not meeting either above or below; a ro/(vof, signifying naked, and x'^P"'> signifying space, in reference to the bare interbra
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