ASTKUcll>l'\ nh NORTH PACIFIC AND ADJACBN1 WA it-HKH 118 



Thii i- still spinier than f. regvlaru and seems to be i northern counterpart of 

 f. plena, o« urs al Karluk, Kodiak, with a rarietj "f /. camtschatica f nitida 



which it resembles, and with which it possibly intergrades The two form- are 

 evidently very closely related. Siderea differs in having the dorsal spinulation more 

 >lated| without longiserial arrangement. A comparison of Plate 52, Pigures 1,2, 

 with Plate 50, Figure I, will answer better than detailed description. This vai 

 of nitida may constitute an intorgrading subforma sin,.- no hiru'c typical nitida has 

 been found »t Kodiak. 



Verrill'fl type of tiderea is lost hut his figure i- duplicated by a specimen from 

 Knrluk. Kodiak Island (PI 52, fig. 2 l The abactinal spinelets are medium robust, 



capitate, rather truncate, HI to 0.6 mm long, and the vertical ii arm ei I with 



Battened often leaflike thornlets similar to those of /. asqvalia. Spinelets not so 

 prominent along the earinal line as in the Middleton Island specimen. The adam- 

 hulneral spinelets are robust, clavate, irregularly cue and two, or only one to a pli 

 nctinal spinelets still stouter ami a little longer; inferomarginal Bpinelete BubequaJ to 

 actinals; Buperomarginals intermediate between inferomarginals and abaotinalB. 



The apical mouth spines are stout, about as long as plate- Straight pcdicellariao 



rather inconspicuous, elliptical ovate to lanceolate ovate, compressed. The crossed 

 pedicel luriae mi '_"_' mm long) do not have oomspicuous teeth on border of terminal lip. 



Two specimens from Anchor Point, 20 miles wot of Homer, Cooks Inlet, are 

 remarkable for t heir large size The larger has K 80 mm., r 18 mm., ray width 20 mm. 

 These specimens do not have the maximum number of dorsolateral Bpinelete, which 

 are coarse anil sometimes tubercular; and the proximal soperomarginals have some- 

 times only one spine, while the distals have two Straight pedicellariae rather 

 plump, lanceolate to ovoid These specimens may he classified either as multispinous 

 regvlarit or a- less spiny siderea. 



Type of forma siderea. Lost 



Type locality of forma siderea, Not stated; Yakutat, one of the localities 



mentioned by Ycrrill, may he designated, 



Distribution. Kodiak Island and Middleton Island to Yakutat Bay. 



Forma PI.KN * Vrrrill 



Plate it. Figure 3; Plate 61, Flgui 5 9; I Figure 7 



/.. ,• tjriehtora plena Vbbbilu 



picMora \ I \ > umi.t.. 



/'■;. A southern more multispinous counterpart of which dilTers 



in having the abactinal Bpinulation somewhat more clumped, the groups of spin. 

 sometimes subdivided into five verj irregular multiple Ion i Bpinelete bj 



irregular Ion .f papular depressions; Buperomarginals three to five usually 



unequal, in a vertical series or a group; occasionally -i\ or at ran on a few proximal 

 plates and two on distal; inferomarginals two or three; actinals one adambulacrals 



one and two in alternation over most of ray ; B few proximal plates sometimes i 



lively diplacanthid; furrow spinelet of diplaoanthid plates slenderer than the others 

 which are subcylindrical to clavate. K 40 mm . r [2 mm , br. \'2 mm.. I; 

 Porrester - and). 



