BULLETIN OF THE 
Ophiozona )۶( dubia sp. nov. 
Plate IX. Figs. 19-21. 
Special Marks, — Two or three small arm-spines. First pair of side arm- 
plates very large, and meeting outside the mouth-shield. 
Description of an Individual (Station 44). — Diameter of disk 3.5 mm. 
Length of arm 6.5 mm. Width of same without spines.8 mm. There are 
about ten short, rounded, bead-like mouth-papille, closely set, with one or two at 
the apex lying below the teeth, which are large and spearhead-shaped. Mouth- 
shield small, rounded diamond-shape. Side mouth-shields short, rather wide, 
and meeting within, Under arm-plates small, shield-shape, with an angle in- 
ward ; longer than broad, with very deep re-entering curves on the lateral 
sides, so that those towards the end of the arm have but a thin partition be- 
tween the tentacle-pores, Side arm-plates large, swollen without, meeting 
broadly above and below, so as to form almost the entire covering of the arm. 
The first pair are of great size, and meet just outside the mouth-shield, covering 
nearly the entire lower interbrachial space. Upper arm-plates very small, long 
diamond-shaped, with the sharp angle inward. Disk five-sided and somewhat 
swollen, covered with thin, broken, ill-defined, angular plates. Radial shields 
longer than broad, rudely oval, nearly or quite meeting without, diverging widely 
within ; wedged between their outer points is a diamond-shaped scale. In the 
interbrachial space there is one large angular marginal plate. Two or three short, 
blunt, tapering arm-spines situated midway on the outer edge of the side arm- 
plates. One round tentacle-scale on the inner edge of the tentacle-pore. Color 
in alcohol, white. Station 44, 539 fathoms, 1 specimen. 
The great size of the first pair of side arm-plates and the want, of definition 
in the disk-plates seem to make the position of this species in Ophiozona doubt- 
ful, but I think it best to wait for larger specimens before settling definitely its 
position. 
Ophiostigma isacanthum Lym. 
Ophiura isacantha Say, Journ, Phil. Acad. V. p. 150, 1825. 
Ophiostigma moniliforme LTK., Addit. Ad. Hist. Oph. p. 132. 
Ophiostigma isacanthum, Tl. Catal. Mus. Comp. Zoól. p. 103, Figs. 8, 9. 1865. 
Station 10, 37 fathoms, 3 specimens. Station 12, 36 fathoms, 1 specimen, 
Station 39, 14 fathoms, 1 specimen. 
Ophiactis Mülleri Lrx. 
Ophiactis Mülleri, Vid. Meddel. Jan. 1856. p. 12. 
Key West, Fla. 12 + specimens. Station 11, 37 fathoms, 12 4- specimens, 
var, quinqueradia, 
Ophionereis reticulata Lrx. 
Ophiura reticulata Say, Journ. Phil. Acad. V. p. 148, 1825. 
Ophionereis reticulata, Addit. ad Hist, Oph. Pt. II. p. 110. 1859. 
Station 11, 37 fathoms, 1 specimen, 
