\- \ 01 NORTH PA( II [I \\1> AIM II - 1 ;-li; 



Bpinelets which Btand in single 61c on thi ir reticulum of I 



divide the abactinal area into areolae, or are mon attered, 



the reticulation is tt< • t bo e\ ident . Buperomargina] spines in rape of 1 1 



to five; adoral adambulacra] Bpinee slightly longer In mature specimens K 

 7.6 r and 4 to 6.5 br. Largest specimen, B 310 nun., r 46 mm l; 7r 



The abactinal Bpinee are nil small mid of nearly uniform ept Dear tin 1 



tip of tin' ray, where in Borne bul not nil Bpeoimena they are unequal, the l> 

 doubtless being homologous with tin- major abactinal spines "f a2n The 



Bpinelets are numerous, nearly equal, either tapered <>r clavate, with rough suit 

 tips, and they either Btand in single tile on the skeletal meshes, very definitely sub- 

 dividing the dorsal area into rather irregular, numero 'he papular an 

 or. less often, they do not form any verj evidenl reticulations. In the t\; 

 men: 'Mosl ol thi Be on the basal part of the rays Btand in Bhort bran 

 rows or combs, varying from .' or :; to 10 or more, bul many Btand singly <>r in small 



.•luster- On the di-tal third of the rays the\ become much more crowded and 



Btand in -mall groups or singly; on the disk they form irregular shorl rows or in 

 feet reticulations." Verrill Several specimens from Unalasks and Victoria exl 

 this imperfect reticulation bul it is only to individual variation. 1*1 61 

 More often tin' Bpinelets are arranged in a definite reticulate pattern, in which 

 the Bpinelets are more numerous. (PI. 'it, ti_--. 2, 3.) <>n tie- proximal half of ray 



"actuations are more or lees Lengthened transversely, so that the Bpin< 

 appear to form transverse combs of variable length, because the transverse trabecules 

 are much longer than the connecting longitudinal ones, The carina! Bsriee maj 

 be distinct or it may he well marked, a- m mosl of the Tongass examples, in which 

 the spinelets Btand in Beveral rank- along the radial line 



The Buperomargina] Bpinee are similar to the dorsals bul a little longs/ ami 



BtOUter. There are generally three, four, or e\ en five to a plate, in an arcuate vertical 

 Comb; or a comb of three, with an extra -pine on it- adoral Bide. l>l-ttilly tl 



are reduced to two Bpinee, ami near the tip there is usually only one spin 



subequal; or the fourth ami fifth spine-, when present, may be 



-mailer: or the ban -pine of the series may he somewhat enl • r the ol 



[ntennargmal channel broad in large specimens; in medium sized one- nam 

 than the BuperoinargmaUcombs. 



Lnferomargina] ami actinal spines similar in form to those of aUeolait 



crowded, and incrca-im: in -i/.e from the inferoinarpnals which are a lit; 



than the Buperomarginals] toward the furrow. Lnferomargina] spines axe usually 



two to a pb) timefi three, ami at lia-e of i The -; 



or tapered, obtuse, or bluntly pointed, finely striated at the end- Then tally 



three row- of actinal plate- at the base of the ray: rather exceptionally four Verrill 



mention- five, hut I have never found -o many m my b| Plates ( the 



er row bear two or three Bpinee in an obliqut the oth< i ally two; 



whence the crowded condition of the actina] armature The -pine- varj 



in caliber from a slightly swollen form with a tapered hlunt terminal half, to bn 



elevate, subtruncate, In the very lai nens the interactinal channel* 



marked hut tend in ol rated bj a crowded aim."' 



