EASTERN TUOFK'AI. FACIFIC ASTEROIDEA. 91 



HH.2 Orals 3-5. 



I.^ Paxillar spini'lcts -1-7; valves of oseulum with If) spines; actino- 

 lateral spines 18, with eighth or ninth longest; adambulacral 

 spines usually 3, the innermost smallest, but sometimes 4, the 2 



inner smallest gracilis. 



11.^ Not as above. 



J.' Adambulacral spines 3. 

 K.- Orals only 3. 



L.' Valves of oseulum duplicated by a smaller external series alcocki. 



LL.' Valves of oseulum not duplicated. 

 M.' Paxillar spinelets 4 or 5. 

 N. Paxillar crowns forming raised areas and sharply defining the rays. 



caelalxis. 

 NN. Paxillar crowns not forming raised areas and not defining rays 



clearly latebrosus. 



MM.' Only 1 well-developed paxillar spinelet regalis. 



Illi.2 Orals more than 3. 



L.^ Suborals short and wide (or thick). 



M." Adambulacral spines very unequal; supradorsal membrane with 



numerous minute granules graniferus. 



MM.2 Adambulacral spines subequal; supradorsal membrane without 



granules memhranacevs. 



LL.- Suborals more or less elongate and tapering. 



M.' Adambulacral spines very unequal; rays conspicuously defined 



dorsaliy rex. 



MM.' Adambulacral spines subequal. 



N.' Tenth to seventeenth actinolateral spine longest. 

 O. Inner (proximal) pair of suborals the longest. 



P. Orals 4 subequal; outer suboral stouter than inner, shorter 



but not greatly so bartschi. 



PP. Orals 5, the two inner ones much larger; outer suboral much 



smaller in every way than inner porosissimus. 



00. Outer (distal) pair of suborals much the longest crucifer. 



NN.' Sixth actinolateral spine longest; suborals subequal fucalus. 



JJ.' Adambulacral spines 4. 



K.' Paxillar spinelets 3-5; orals 4 platy acanthus. 



KK.' Paxillar spinelets 5-6; orals 3 densus. 



EE.^ Suboral spines 3 on each plate 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 nmi. high and about 18 imn. in 

 diameter at the mouth of the bell. PaxiUae in three series along each ray ^\^th 

 an additional partial row along each side of base of ray. Paxillar spinelets 

 5 or 6 rather long, longer than stalk of paxiUa; 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, kregularly scattered. 

 Oseulum large, about 10 nmi. across; each valve with about a dozen spines, 



' KprjuvaSTls = steep, in reference to the remarkable form of the jaws. 



