BULLETIN OF THE 
Ophiacantha longidens sp. nov. 
Plate X. Fig. 274. 
Special Marks. — Disk closely set with slender stumps, each bearing a crown 
of three to five long delicate thorns; arm-spines translucent and thorny ; 
seven long slender mouth-papille ; tentacle-scales spiniform. 
Description of a Specimen (Station Cebu, Philippines). — Diameter of disk 
4mm. Width of arm without spines 1mm. Seven mouth-papille to each 
angle, of which the lateral are long, spine-like, and blunt ; and the innermost 
one is of a blunt spearhead form, like thg four teeth above it. Mouth-shield 
small, wider than long, bounded by a curve without, and an angle within, 
Side mouth-shields small, narrow, meeting within. First under arm-plate 
small and rounded ; second of an irregular transverse diamond-shape, wider 
than long, having the lateral corners sharp, and a slight lobe without (Fig. 274); 
those immediately beyond are similar, having a wide axe-shape, with a clean 
curve without. Upper arm-plates small, of a wide fan-shape, with the angle 
inward, and lateral corners sharp. Side arm-plates rather large, meeting above 
and below, with a well-marked spine-ridge. Disk round, slightly puffed, 
densely set with slender, minute stumps, each bearing a crown of three to five 
long slender thorns. Scaling and radial shields hidden, except the outer tips 
of the latter. Seven flattened, translucent, thorny, rather blunt arm-spines ; 
lengths to that of an arm-joint 2, 2, 1.7, 1.7, 1, 1,.8:.7. One spiniform tentacle- 
scale. Color in alcohol, above, mottled brown; below, white with brown 
markings on arms. 
Cebu, Philippines, 95-100 fathoms, 1 specimen. 
Ophiacantha nodosa sp. nov. 
Plate X. Figs. 258-261. 
Special Marks. —Six arms ; seven long mouth-papille to each angle; disk 
closely set with coarse, stout stumps having thorny ends and sides. 
Description of an Individual (Station 3). — Diameter of disk 7 mm. Width 
of arm without spines 2.3 mm. Seven narrow mouth-papille, the outer one 
longest. Teeth long and narrow, though stouter than mouth-papille. Mouth- 
shield small pentagonal, with a wide angle inward ; length to breadth .7 ۰ 
Side mouth-shields long, narrow and curved, meeting within and extending 
without much beyond the mouth-shield. Under arm-plates pentagonal, with 
a strongly curved outer side, and lateral amd inner lateral sides re-enteringly 
curved ; length to breadth (third plate) .8 :1. Upper arm-plates broad, trans- 
verse diamond-shape, widely separated. Side arm-plates stout and promi- 
nent, meeting freely above and below. Disk densely set with coarse stumps, 
which bear a crown of strong thorns and are also usually thorny on their 
sides, Radial shields and scaling hidden, except the outer tips of the former. 
