iSmaOXDMA 09 NOBIS PACIFIC vm> ADJAl -in;- i i-HKK 139 



tee, but it is much more Blender than thai and baa much larger Minlmlm-ntl p< 

 while the dorsal platee are closely imbricated. 



Sitka Barriman expedition); Queen Charlotte [elands <i M Dawaoo 



/.'- markt.— Unfortunately i tic specimens of tin-- Bpeciee bave disappeared, so • hnt 

 nothing can be added t<> the original description. In the fir>t notice of t » • •- -p- 

 the rays nn- described as five, which is probably h typographical error, as nowhere 

 in the definitive account is any such variation indicated 



C.nus I \ VSTKIUAS \ .rrill 



3 dlow-water Starfishes, etc., 1914, pp 51 161 

 -Fishbr, Ann. and M Hist., mt. 9, voL 1 1 



THag Asteriinat differing from Asteriat in 1 1 n \ i n ir numerous actinal platee 



h bearing one or two Bpines) arranged in from three to su longuwriee which 

 alternate with longiseries of large actinal papulae; inferomarginal platee lateral 

 rather than actinal in position. Abactinal skeleton irregularly reticulate, usually 

 r. <l>u-t , Km composed of small irregular platee the primaries thr r four lobed, the 



ndariee \ arioualy irregularly elliptical or elongate < ; spines short . Btoul ami slender 

 mixed, or Blender only, or robust only, terete, tapered, conical, or subgloboee; adam- 

 bulacral plates Bmall, diplacanthid, or irregularly diplacanthid and triplacanthid, 

 the Bpines carrying prominent clusters <>f crossed and Btraight pedicellariae; adoral 

 carina composed of three to five pairs of adambulacrals; gonads open dorsally, on 

 the disk, close to the interradial Lines 



Bemarka. — This genus, bo far as known, is confined to the intertidal sone and 

 shallow water of the north Pacific from the Okhotsk Sea to central California. It 

 is most abundant from southern Alaska to 3 »und, where in great inlet 



for dominance with Pisaster ochrac* 



In fact it bears considerable superficial resemblance to Pi*a«ter, especially 

 the numerous varieties of P 1 has.' Been short-rayed examples of / 



dii forma alveclata which might easily !><• mistaken for slender-rayed 

 /■ ■■ forma ochraeeiu The resemblance concerns the dorsal spinulation 



ami the multiple longiseries <«f actinal pin * however, almost always has 



ray- which arc broader at the base and evenly tapered; monacantbid adambulacral 

 plates; m> pedicellariae on the adambulacral Bpines; much more sunken actinostome; 

 very characteristic furcate Btraight pedicellariae 



The modifications an.) distribution of the abactinal spines exhibit curious 

 analogies in the two genera. Corresponding forms are indicate. 1 in the following list. 



ma. 



tarhrlii f. trorrhfln. 



trr giganltn*. 



. < f. itfhr ■: 



I \ «>l I 111 «-• 1 llo^i MM II >l.mp«on 



tpidUora Brandt, Prodromus, I s ; " 



1 n f|ilf/l/nnl Stiv "! Nat H 



rh.ln Stimi—.v. Pi - I'lllHIKB, 



-:.V p ;t Bn i. Pi - 1881, it 



505 - Wiim ■ 1887, p Llfl 



