1106 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The rather crowded inferomarginal plates form the border of the plane actinal surface. Each 1 1 
plate bears 2 spines in a diagonal, crosswise series, the outer spine usually the longer. Both are ' 
flattened, chisel-shaped, and radiate slightly apart. The outer is as long or a trifle longer than the j 
superomarginal spines, and bears, on the outer side of base, a thick, subglobular cushion of pedicel- jj 
larite, which do not in this case form a wreath. Each plate bears also 1 or 2 fairly large, forficiform ,] 
pedicellarise at the base of the spines; the inferomarginal plates form a ventrolateral carination to the i, 
ray which extends further ventrad than the adambulacral plates. In a sort of shallow groove between 
the 2 is a longitudinal series of large, solitary, bag-like pedicellarias. In the actinal interradial fur- i 
row there are 8 to 10 large forficiform pedicellarise. 
Adambulacral plates are small and crowded. Armature consists of 2 equal, flattened, very slightly i 
tapering, obtusely tipped spinules nearly as' long as the inferomarginal spines but much slenderer, -i 
The tip is often truncate. Ambulacral furrow crowded with quadriserially arranged tube feet. 
Madreporic body large, 3 mm. in diameter, subcircular, situated near margin. Striations fine,' |j 
radiating. 
Color in life, rather pale Naples yellow, the arms broadly barred, and the disk mottled, "with rich i 
brown madder. A very young specimen is Naples yellow, cadmium at tips of arms. 
Young: Small specimens (R=6 to 23 mm.) which I have considered the young of this species ! 
differ considerably from the adult in general appearance. The rays are not so high, and the abactinal i 
and superomarginal spines are reduced to tubercles on the plates. An intermediate series of abactinal 
tubercles extends about one-third the length of the ray. The pedicellarise are few in number and are 1 
scattered over the abactinal and lateral surfaces. The papulse are still single. On the disk there is a I 
pentagonal series of tubercles, the primary radials being largest. Inside this apical area are numerous ' 1 
other thimble-shaped tubercles or spinelets. Inferomarginal spines 2, as in adult. Some specimens , 
with regenerating arms are 6-rayed. 
Localities: Type (no. 21188, U. S. National Museum) from station 3885, adult and young, Pailolo. i 
channel, between Maui and Molokai islands, 136-148 fathoms, sand and pebbles; bottom temperature [ 
64.8°. Taken also at the following stations: 
Record of localities. 
Station. 
Locality. 
Depth. 
Nature of bottom. 
3835 
South coast of Molokai Island 
Fathoms. 
169-182 
Fine brown sand, mud. 
Fine sand and mud. 
3859 
Pailolo channel 
138-140 
4045 
West coast of Hawaii Island 
198-147 
Coral sand, foraminifera. 
Coral, volcanic sand, shells. 
4062 
Northeast coast of Hawaii Island 
83-113 
4064 
do 
63-107 
Do. 
4066 
Aleunihana channel, between Hawaii and Maui islands 
176-49 
Rocky. 
4079. ... 
North coast of Maui Island 
143-178 
Gray sand, foraminifera. 
Coral sand, shells, foraminifera. 
4100 
Pailolo channel 
130-151 
4101 
do 
143-122 
Do. 
All these specimens, 31 in number, are immature except those from station 4062. 
This species is most nearly related to Stolasterias eustyla Sladen from the Tristran da Cunha Group, 
100-150 fathoms, from which it differs in having 2 instead of 3 inferomarginal spines, stouter and 
longer adambulacral spines, and a very much less developed intermediate row of spinules between 
the superomarginal and medio-radial series. Mr. Sladen states in his description of eustyla (Challenger 
Asteroidea, p. 587) that each superomarginal and, by implication, each carinal plate bears a spine. 
In the present species it is each alternate plate. 
Genus HYDRASTERIAS Sladen. 
Hydrasterias (subgenus of Asterias) Sladen, Challenger Asteroidea, 1889, pp. 563, 581. Type Asterias ( Hydrasterias ) ophidion 
Sladen. Hydrasterias Perrier, Exped. Scientif. du Travailleur et du Talisman, Echinodermes, 1894, p. 109. 
Hydrasterias verrilli, new species. 
Rays 5. R=85 mm. ; r=ll mm. R=7.7 r. Breadth of ray at base, 13 mm. ; greatest breadth, a 
little beyond the base 16.5 mm.; breadth about midway between base and extremity, 10 mm. 
Rays elongate, rather narrow, inflated near base, thence tapering to the pointed extremity; 
depressed near base but distally subcylindrical. Interbrachial arcs very acute, the series of adjacent 
