REPORT ON THE ASTEROIDEA. 563 
b, Armature of the adambulacral plates consisting of two spines. Infero- 
marginal plates with oblique combs of three spines . . i c triremts. 
D. Asterias ophidion group : Abactinal plating forming a delicate, wide-meshed, 
quadrate network. Spinelets small, isolated, and few in number, 
Pedicellari isolated : : ; .  Sub-gen. Hyprasrertas. 
a. Diplacanthid: Armature of the ae ain evel letee consisting of two 
spines . : : 7 : ophidion. 
E. Asterias miilleri group : Wprexnal shidielogs emalt aa nel ied Papule 
isolated or very few together . : . Sub-gen. Leprasrertas. 
a. Rays rather short and broad. Abastinal spines ‘renal arly distributed . q miillert. 
b. Rays elongate and narrow. Abactinal spines subregularly arranged 
in longitudinal lines. : . compta. 
F. Asterias tenuispina group: Abactinal spinelets nay definitely avangeds 
large and isolated, with thick wreaths of pedicellariz . Sub-gen. Sronasrerras. 
a. Heteractinid: With more than five rays. 
a. Monacanthid: Armature of the adambulacral plates consisting 
of one spine. 
a. Infero-marginal plates with two spines. With one or 
more intermediate series of abactinal spines between 
the median radial and the marginal series. 
i, With two abactinal intermediate series of spines. 
Wreaths of pedicellariz flat and wide, not 
raised, Large isolated forficiform pedicel- 
larie between. With eleven equal rays : : gemmifera. 
i. With one abactinal intermediate series of spines. 
Wreaths of pedicellarie, thick and bushy, 
raised. No forficiform pedicellarie between, 
With seven to nine rays, usually unequal. 
1. With long pointed spines, autacanthid (Bell) ; tenuispina. 
\2. With short conical spines, typacanthid (Bell) : calamaria. 
f. Infero-marginal plates with one spine, No interme- 
diate series of abactinal spines between the median 
radial and the marginal series : P : c é volsellata. 
b. Pentactinid: Having five rays, j 
a. Diplacanthid : Armature of the adambulacral plates consisting 
of two spines. 
«, With two or three complete intermediate series of abac- 
tinal spines between the median radial and the 
marginal series, No intermediate spinelets be- 
tween the infero-marginal and the adambulacral 
spines . 9 é : stichantha. 
f. With one incomplete ieemacdiats series of placed 
spines between the median radial and the marginal 
series. With an intermediate spinelet between 
the infero-marginal and the adambulacral spines. 5 eustyla. 
b, Monacanthid: Armature of the adambulacral plates consisting 
of one spine. 
«, Rays with vertical lateral walls. Median line of abac- 
tinal spinelets straight. Intermediate spines few 
and large, : é 5 : : : . glacialis. 
