ISTEROIDBA 01 NORTH PACIWC \M» UMACENT W • : l-IIKit 31 



'I'll, actinostomial frai mposed i ombined first arabuli 



plus the five internally, and the five pairs <>f mouth pi 



■ a ally, is stout and th<- actinostome is small • is broad 



length of the firsl ambulacra! ■ The latter i- prominent and the radial suture 



i lir -i\ - measure common 



proportion in the i ialized A teriidae. Th lontophi orradiaJ i 



to which the i ud the interl 



• asiderably !•:• ban ili<' interradial d iter- 



irregular pla ly filling the 



membranous septiun, sometimes leaving irregular uncalcified spi 



There are no lateral pockets of the coeloi . . . | ih,. 



inner surface of the actinal and marginal plates. The inferomarginals hav< 

 long dorsal lobes, plane on the coelomic si b underlie the descending lobe <>f 



the superomarginal; the actin imilar l>ut shorter dorsal lobe. There is a 



rudimentary Becond series of actinal plates visible from the inside in large sp< 

 even when uol evidenl Bxternally. 



Internal The gonads when mal large, tl being !.- 



than the and sob ly to th< i 



from the very limited number of examples exami ■ iear to be mon com] 



shorter, with a few divisions, the surface irregular from many lobules. The U 

 consist of M long < antral axis, giving rise on the outer Bide to numerous short ■ 

 verj irregular lobes and on the inner or ambulacra! side to sis or eight long slender 

 subdivisions \i hich are provided also with irregular lobules. The gonads are attached 

 to the wall of the ray on the inner Bide of a Buperomarginal plate, <>r ju>t below it. 

 and exactly opposite the interbrachia! angle. The short slender gonoduct turns 

 downward and passes outward very close to the interradia! line, between the ascend- 

 ing lobes of the first two inferomarginal plates. In a large specimen from star 

 August 3, 1891, tin- prominent Bubspherical genital papillai - in each 



actinal interradial area, in lino with the actinal plate \ ailing, probably the d 

 leads downward to each papilla, which has a conspicuous terminal aperture. 



The stomach is spacious with strong muscular attachments to the ambulacra] 

 The In pati ■ • b nearly to the end of the ray but the intestinal coecum 



all, witli two short blunt lobes, each usually subdivided at the end into two. 



Type. Cat.No 76251 S.N.M. Typeofformi No E14 



Typt locality. -Ten miles wesl of Poinl Franklin, Ala fi 



fathoms, sand, August 31, 1883 (42 specimens). The type locality of forms 



station 3277, Bering Sea, latitu 15" N., longitude 161 16' 10" W., 



ithoms, Band, gravel, rocks, bottom, temperature, 13.2 F. 



!' I From Bouthern Bering Sea and Aleutian Islands to Ann.- 0© 



.anl tn Dolphin and Union Strait, Nortweet Territories; .'.nd from low tidi 



th b. 



Forma arctica. From Cape Franklin t«' Bering Strait- in the Arctic Ocean, tl • 



; i in the eastern part of Bering Sea t" about latitude 60 when it verj gradually 

 in tergrades with form On the west side of B< 3< outh to the Com- 



mander Islands fjat. B5 Vertical range G to 21 fathoms. 



