THE STARFISHES OF THE HAWAIIAN ISLANDS. 
1031 
peripheral series are nearly alike and form a coordinate group. Fairly well defined channels run 
between the series of keels or pedicels, interradially from inferomarginals to adambulacrals. 
Superambulacral plates are feebly developed, scarcely more than rudiments, the series extending 
about one-half length of ray, and absent from innermost 4 to 6 adambulacrals. They appear to be 
better developed in medium-sized than in fully adult specimens. 
In this species the gonads are clustered on either side of the interradial line and do not extend as 
a longitudinal series along either side of the medio-radial line far into the ray, as in Dipsacaster nesiotes. 
Madreporic body is fairly large, nearly hidden by paxillse; irregular in outline; striations radiating. 
Situated slightly nearer to margin than midway between margin and center of disk. 
Color in life: Abactinal paxillar area coral red over area occupied by small paxillse, becoming 
duller or grayish coral red at the sides; actinal surface creamy white; marginal plates the same, tinged 
with pink. Color in alcohol, brownish yellow to ashy white. 
Young: The smallest specimen taken measures R 12 rrim., and r 5 mm., and in general appear- 
ance is very like the adult. The difference is a lack of enlarged spinules on inferomarginal plates. 
The interradial areas are already well developed, and paxillar area is compact as in adult. Another 
specimen of nearly the same size possesses a single enlarged spinule on the edge of the ray. 
Localities: Type (no. 21152, U. S. National Museum) from station 4081, north coast of Maui, 202-220 
fathoms, gray sand and foraminifera; bottom temperature, 51.7°; abundant. Taken also at the 
following stations, in all 414 specimens. 
Record of localities. 
Station. 
Locality. 
Depth. 
Nature of bottom. 
3919 
4044 
4082 
4083 
South coast of Molokai Island 
South coast of Oahu Island 
West coast of Hawaii Island 
North coast of Maui Island 
do 
Fathoms. 
238-255 
267-220 
233-198 
220-238 
238-253 
195-241 
241-282 
295 
Brownish gray mud and sand. 
Gray sand. 
Fine gray sand. 
Gray sand. 
Do. 
Coral sand, foraminifera. 
Do. 
Fine white sand. 
4115 
4116 
Northwest coast of Oahu Ialand 
do 
3472 
South coast of Oahu Island 
This species is found, therefore, at a depth of about 250 fathoms and apparently does not range 
much over 30 fathoms either side of this average. It was taken on a special line of dredgings north 
of Maui which were made for the purpose of determining vertical distribution. 
The chief differences between this and the foregoing species have already been pointed out. The 
present form is in some respects intermediate between the Astropectinidse and Plutonasteridae. 
The species is named for Prof. Charles Cleveland Nutting. 
Family LUIDIID^E Verrill, i8qq. 
Luidiidae Verrill, revision of certain genera and species of starfishes, with description of new forms. <Trans. Conn. 
Acad., vol. x, 1899, p. 201. Equivalent to Luidiinae Sladen, Challenger Asteroidea, 1889, p. 244. 
Genus LUIDIA Forbes 
Luidia Forbes, Mem. Wern. Soc., vol. viii, 1839, p. 123. 
Key to Hawaiian species of Luidia. 
a. Rays more than 5, mottled with brown. 
b. Pedicellariae very few; abactinal paxillse rounded, with one or two prominent spinules; adam- 
bulacral spines 4. No inferomarginal pedicellariae hystrix. 
bb. Pedicellariae numerous, conspicuous, 2 to 4 between inferomarginal and adambulacral spines; 
the latter 3 in number. Inferomarginal plates, with 2 to 4 pedicellariae magnified. 
aa. Rays constantly 5. 
6. Prominent lateral spines to ray Luidia sp. 
bb. No prominent spines on ray brevispina. 
