2. STEROLS: STRUCTURE AND DISTRIBUTION
151
TABLE IX (Continued)
Classification
Pisaster giganteus (89)
Pisaster ochraceus (89)
Pycnopodia helianthoides (89)
Class Ophiuroidea (brittle stars)
Order Ophiurae (brittle stars)
Family Ophiactidae
Ophiopholis aculeata (89)
Family Ophiocomidae
Ophiocoma riisei (89)
Family Ophiolepididae
Ophiura sarsi (186)
Family
Ophioplocus japonicus (183)
Order Euryalae (basket stars)
Family Asteronychidae
Aster onyx loveni (186)
Family Gorgonocephalidae
Gorgonocephalus arcticus (186)
Gorgonocephalus caryi (183)
Class Crinoidea (sea lilies)
Family Pentacrinidae
Cenocrinus asteria (89)
Family Antedonidae
Antedon rosacea (89)
Family Comasteridae
Co master japonicus (183)
Comatula sp. (186)
Class Holothuroidea (sea cucumbers)
Order Dendrochirota
Family Cucumariidae
Cucumaria chronhjelmi (183)
Cucumaria frondosa (89)
Cucumaria quinquesemita (188)
Thyone briareus (89)
Fat
content
of total
(%)
9.4
5.3
5.6
—
1.0
2.4
2.1
2.6
2.3
2.3
2.6
2.6
5.3
1.5
2.0
—
—
1.0
Unsaponifiable
fraction
of fat
(%)
7.2
18.5
15.5
—
25
14
30
18
20
30
19
40
17
30
17
13
—
17
Sterol of
unsaponi
fiable
fraction
(%)
50
—
—
—
30
33
35
39
43
62
29
30
43
35
8
5.5
—
14.5
Rotation [<*]D°
Acetate, 3.8
Acetate, +0
Acetate, +4
Sterol, -36
Sterol, -40
Acetate, —49
A
5 -Sterols
c
Acetate, —47
Acetate, -47
d
Acetate, — 39
e
Acetate, —41
Acetate, —40
Acetate, —38
Acetate, — 47
/
Sterol, 0
Sterol, 0
A
7 -Sterol
A
7 -Sterol
c Poriferasterol (II, R = M), clionasterol (II, R = L), probably also ß-sitosterol
(II, R = J) and stigmasterol (II, R = K).
d Some cholesterol.
e Possibly some ß-sitosterol (II, R = J).
f A diunsaturated sterol has been isolated from this species which does not appear
to be identical with any known sterol. It has tentatively been called crinosterol, m.p.
138°, [a] D -47.2°; acetate, m.p. 147°, [a] D -47.2°; acetate tetrabromide, m.p. 186°;
benzoate, m.p. 143°; [a] D -17.6°.