ECIIINODERMATA. 763 
papiliro, flat and uniform. Linchia lias two series of granular ambulacral pa- 
pillm (Liitken, 1. c. p. 163). 
Ophidiaster unifascmlis (Gray) is described by Liitken in full, 1. c. p. 166. 
ScT/tmter f/alnthcc^, sp. n., Liitken, /, c. p. 167. 
Oreaster deyardinsii must belong to Scy taster. Liitlten, 1. c. p. 168. 
Asterias canariensis.^ D’Orbig., is probably Chcetaster longipes, Retz. Lut- 
ken, 1 . c. p. 169. 
Ophiura. Lyman (/. c. p. 16) takes as the type of this genus O. Icevis. It 
is Ophiura, Lamk. (nun Forbes). 
Opkioglypha, g. n., Lyman, 1 . c. p. 40. Disk covered with unequal, crowded, 
naked, more or less distorted scales, some of which are swollen. Radial 
shields naked and swollen. Teeth. No tooth -papillae. Mouth-papillae long 
within, but small and short near the outer end of the mouth-slit and partly 
hidden by the scales of the mouth -tentacles. Arm-spines few (commonly 
three) arranged along the outer edge of the side arm-plates. Tentacle-scales 
numerous ; the innermost pair of tentacle-pores shaped like slits, surrounded 
by numerous teutacle-scales and opening diagonally into the mouth-slits. 
Side arm-plates meeting nearly, or quite, below, but not above. In the back 
of the disk, where the arms join it, a notch, edged with papillfe. Two 
genital slits starting from the sides of the mouth-shields. Type O. lacertosa^ 
Linck, sp. 
Opliiop)locus, g. n., Lyman, 1. c. p. 68. Disk closely and finely scaled above 
and below. Genital scales hidden. Teeth. No tooth-papillfe. Mouth papillae. 
Side mouth-shields wide and nearly or quite meeting within. Arm-spines ar- 
ranged along the outer edge of the side arm-plates. Upper arm-plates divided 
on the middle line into halves, which at the base of the arm are placed at 
the outer lower corner of the joint, on each side being separated by a 
number of supplementary pieces. At the tip of the arm the plate is simple ; 
then it divides in two, and the halves are gradually forced apart by the in- 
trusion of supplementary pieces. Two short genital slits extending only half- 
way to the margin of the disk and beginning outside the mouth-shields. Type 
O. imhricatus (M. & T.). 
Hemiopholis, g. n. (Agass. MS.), layman, 1 . c. p. 137. Disk above covered 
with rounded rather thick scales and with large radial shields; below 
naked; at the base of each arm, disk slightly indented. Teeth. No tooth- 
papill?e. Two mouth -papillae to each angle of the mouth. Side mouth-shields 
touching each other, so as to form a continuous ring round the mouth. 
Three short tapering arm-spines. Two genital slits beginning outside the 
mouth-shields. H. cordifera (Bose, sp.). 
Ophiophragmus, g. n., Lyman, 1 . c. p. 131. Disk small and delicate, fur- 
nished with uncovered radial shields and covered with naked scales; the 
scales along the edge of the disk are turned up, so as to make a little fence. 
Teetii. No tooth-papillae. Six mouth-papillae to each angle of the mouth. 
Arms slender, even, more or less flattened ; arm-spines short and regular, 
arranged along the sides of the side arm-plates. O. wurdemani^ Lyman. 
Ophiocnida, g. n., Lyman, 1 . e. p. 133. Disk small and delicate, furnished 
with uncovered radial shields ; its coat of naked overlapping scales is beset 
with small thorns. Teeth. No tooth-papillos. Six mouth-papillae to each 
