EASTERN TROPICAL PACIFIC ASTEROIDEA. 91 
HH Orals 3-5. 
I. Paxillar spinelets 4-7; valves of osculum with 15 spines; actino- 
lateral spines 18, with eighth or ninth longest; adambulacral 
spines usually 3, the innermost smallest, but sometimes 4, the 2 
INNET AMA EN Goer tere ctacta iielstereie aise aes lee eee Raa T Cases Se aereate gracilis. 
Il.2 Not as above. 
J. Adambulacral spines 3. 
K Orals only 3. 
L.1 Valves of osculum duplicated by a smaller external series...... alcockt. 
LL. Valves of osculum not duplicated. 
M.! Paxillar spinelets 4 or 5. 
N. Paxillar crowns forming raised areas and sharply defining the rays. 
caelatus. 
NN. Paxillar crowns not forming raised areas and not defining rays 
Cleary Asie obverse: ois eis evs oe ae, faye 0) a1 ore Si imp areteye aces latebrosus. 
MM.! Only 1 well-developed paxillar spinelet...................- regalis. 
KK. Orals more than 3. 
L.2 Suborals short and wide (or thick). 
M.* Adambulacral spines very unequal; supradorsal membrane with 
numerousuminute pranules’ = coc ss-. 5-5 siete scissile graniferus. 
MM. Adambulacral spines subequal; supradorsal membrane without 
pranules 73325. Osc jee i ie tier ts patie ne cmeatas membranaceus 
LL. Suborals more or less elongate and tapering. 
M.* Adambulacral spines very unequal; rays conspicuously defined 
MM.* Adambulacral spines subequal. 
N.1 Tenth to seventeenth actinolateral spine longest. 
O. Inner (proximal) pair of suborals the longest. 
P. Orals 4 subequal; outer suboral stouter than inner, shorter 
butimot: greatly, soe a2 ee sete = foe iri- cic mmeis ers bartschi. 
PP. Orals 5, the two inner ones much larger; outer suboral much 
smaller in every way than inner............ porosissimus. 
OO. Outer (distal) pair of suborals much the longest....... crucifer. 
NN. Sixth actinolateral spine longest; suborals subequal..... . fucatus. 
JJ.?- Adambulacral spines 4. 
14s Paxillan spimeletsia—os OFals! 4: seas ce cin bayer ste sees = le platyacanthus. 
KK 2 Paxillarspmecletsyo—Gs, OFAIs or reser etoteciets eels Sadat som ees densus. 
EE:*' Suboral. spines'3 onyeschi plate: 5. 22.22% 2s asOee oc spctse secs ee week anomalus. 
Hymenaster cremnodes,' sp. nov. 
Plate 4, fig. 1. 
Rays 5. R= 27 mm.; r= 24 mm.; R= 1.125 r. In its present con- 
tracted bell-shape, the specimen is nearly 27 mm. high and about 18 mm. in 
diameter at the mouth of the bell. Paxillae in three series along each ray with 
an additional partial row along each side of base of ray. Paxillar spinelets 
5 or 6 rather long, longer than stalk of paxilla; each spinelet has a thickened 
cap of skin over its tip, these caps forming conspicuous little blunt cones all over 
the dorsal surface. Spiracula numerous, rather large, irregularly scattered. 
Osculum large, about 10 mm. across; each valve with about a dozen spines, 
1 kpnuvadns = steep, in reference to the remarkable form of the jaws. 
