ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS— FISHER 57 



d> Ravs five to many; in combination with two inforomarginal spines, heavily sheathed, 

 " and an abortive abactinal skeleton and no actinal plates; abactinal spines bearing 



prominent wreaths of crossed pedicellariae Pycnopodnnae Vernll. 



<P Rays five to many; with a well-developed abactinal skeleton, two sheathed inferomar- 



' ginal spines and one series of actinal plates. Carinals, marginals, act.nals and 



often dorsolaterals in definite longiseries; abactinal, marginal, and actinal spines 



(when present) prominent, spaced, styliform or acicular, normally one to a plate 



except inferomarginals), wreathed with pedicellariae and often in evident longi- 



' . r Coscinasterunae it isher. 



cpT"i(*S _ .. — — — — — ___— — — — — — — •• — — ^ 



# Ravs five, in~co"nne"c~tion with peculiar macrocephalous crossed pedicellariae and abactina 

 ' " spines lacking (or with only rudimentary) wreaths of pedicellariae; carinal and 

 marginal plates prominent with prominent spine (inferomarginals in one case with 

 two) ; actinal plates wanting or in one series. Arctic and Antarctic. 



' ' Notaslerimae Fisher. 



6 « Adambulacral spines carry pedicellariae singly or in clusters, or are entirely without attached 

 peMariae; abactinal spines not as a rule prominent, styliform, or acicular and more or less 

 spaced and isolated, but short, slender to stout, conical, tubercular-subglobose variously 

 JrtnSiform, sharp to capitate, single or in groups; abactinal plates in more or less definite 

 W er.es or irregularly reticulate, sometimes abortive; actinal area sometimes broad, with 

 upwards of five longiseries of plates, sometimes without any actinal plates; gonads opening 

 dorsally, laterally, or ventraUy 



Subfamily Pedicellasterinae Fisher 



Pedicellasterinae Fisher, Ann. Mag. Nat. Hist., ser 9, vol. 2, 1918, p. 108; vol. 12, 1923, p. 249. 

 Asteriidae without an adoral carina (the first pair of postoral adambulacral plates 

 separated interradially by a muscular symphysis or in contact only along the adora 

 part of interradial margin); skeleton an open network composed mostly of smaU 

 cruciform or trilobate plates, the dorsolaterals in irregular, the carinal and marginal 

 plates in regular longiseries; abactinal spinelets small, generally one to a plate; 

 never more than one prominent inferomarginal spine; crossed pedicellariae scattered, 

 never in circlets about spinelets; straight pedicellariae present; no adambulacral 

 spine pedicellariae; rays five or six. 



KEY TO THE KNOWN GENERA OF PEDICELLASTERINAE 



rf Inferomarginal spines not conspicuously larger than the superomarginals, nor forming a promi- 

 " n^Uongiseries external to the adambulacral spines; the latter are he longest on ray, 



transverse combs of two to five; no quartet of enlarged or especially strong plates n 

 SmtoSuum; tube-feet biserial; first postoral pair of adambulacral plates widely 



* JSfiSiSS^*-* Pedicellariae with one or more enlarged teeth on the distal 



c- Stotht Pedicellate not unusually large, nor spatulate-unguiculate; gonads opening ven- 

 ' rally actmaiplates of large specimens in closely imbricated transverse series the number 

 of ,£tes per series (in some species) increasing on middle third of ray instead of decreasing; 

 iSTSSSiM of two sorts, the larger with slenderer jaws and four large claw-like 

 Term nal teeth and one to four conspicuous teeth on the shank, below the terminal; the 

 smX(aSnS pedicellariae have numerous small ^_^™£S£& 

 c> Wufyfry'laYgVYpaVula^ gonads opening dorsally; 



actinalpla tes in two simple longiseries; crossed pedicellariae, not obviously of two dif- 

 feSf so'rts have one or two enlarged lateral terminal teeth and numero mm****^ 



