A8TBR0IDSA "I WORTH PACIFIC l\n aiuamvi WATMBB 1 IBBMB LOS 



Shumagin Islands, l Bpecimeo, Round [eland, Coal Harbor, I 



lis, 1 Mil <-||IUMI 



Remarks This species nmv be distinguished from by tin' form <>f the 



siiinll straight pedicellariae, l>y the absence of prominent groups «if carina! and di 



lateral Bpinelets, bj tfa inerally mure uniformly distributed dorsal Bpinelets which 



are df a pretty uniform size, by the aarrower abactinal area and higher position of 



romarginals on the side of the ray, and by the well developed f actinal 



plates It differs froi hatiea in lacking any trace of aerial arrangement of the 



abaotinal Bpineletaand in (lie absence of anj crowding or differentiatioii of the carina] 



Bpinelets, the sa distinction separating it from dispar. It further differs in having 



shorter rays, the intermaiL'inal and actinal papular areas confluent, and very ulr 

 ovate or elliptic, small straight pedicellariae. 



.1 tetra is probabrj one of the eamtschatica group of species, as evidenced l>y the 

 well developed actinal plate- l appears to l»- distinct from all the f"rn 



t8chattea and hexactis. The pedicellariae are rather distinctive. 



I.KrTASTKHIAS I.KI'TODOMA. nrw uprrloi 

 2 '-'". 2tj I'laO 



Dia Rays six. Skeleton weak: abactinal spinelets small, rather widely 



scattered; carinak uol clearly differentiated; Bup< inal, inferomarginal, and 



actinal spines t\ picallj one to a plate, forn e definite lateral Beries well spaced 



from one another; adambulacral plates monacanthid; apical oral -pines rather [i 

 lanceolate ilcnnal straighl llariae; integumenl rather thick pulpy, and thrown 



into irregular transverse folds: abactinal integumenl rather flaccid. R nder, 



well arched. K 29 mm., r 7 mm . R i r; breadth of ray at base, 7 mm. 



I't criptioi Abactinal skeleton weak, entirely obscured in alci.tmlic specimens 

 l>\ pulpy integumenl which is raised in low, irregular, transverse folds and circular 

 disks Buirounding the widely spaced small Bpinelets. These cushions seldom carry 

 pedicellariae abactinally. Abactinal skeleton very irregular, the plates thin, small, 

 irregularly elliptical, oblong, three or four lobed; skeletal intervals small to lai 

 usually a series of large intervals directly above superomarginal plates Lobed 



plates usually carry a single short , tapered, suhtruncate spiticlct (two or three on ■ 



few plates of disk). These are spaced ."> to 10 spine lengths apart and someti 



form three \ir\ irregular longiseries, or else are without serial order. They vary 



greatly in number but for the genus are few and widely -paced 



• romarginal Bpinelets, a little longer than abactinals, one to a plate, sur- 

 rounded by a pulpy disk bearing one to several crossed pedicellariae. They form h 

 vi r\ regular serit s rather high up on the Bide of the ray. 



Similarly tl ■ single Beries of inferomarginal, and one of actmal spit 



ending two-thirds to three-fourtha the length of the raj In the largest S] 



men- then- i- a second short The -puiclcls are slender, ti 



blunt, and increase in length toward the furrow, the actinal- being Ion.. 



of l 5 mm I and sometimes curved The intermargina] and actinal channel- (both 



lateral in position I are broad, bo that the three lateral Beries of spit w II separ 



and the actinals are also fairly well spaced from the adamluihicrals The inter- 



