LSTEROIDBA OF NORTH PACIFK \M> UJJACENT WATBBfl HBB1 79 



process to clean the type and specimens 6 and h. One ray <>f h vmi- detached at the 

 for a -duly of the skeleton and to determine the position of the gonads 

 Although Perrier (1875, pp. 67, 68 redescribed A. katherinae, apparentlj from 

 the authentic specimens of Gray, he mentioned two 5-rayed examples One "f the 

 6-rayed specimens be described as dovgUui, stating that there were also 



several specimens without locality in the Museum d'Histoire Naturelle (p. * » * * * . The 

 British Museum specimen (No. 110 of the foregoing list) was considered the type 

 The dimensions R 70 mm., r 17 mm.) '""I description given by Perrier apply to it. 

 h -•'i-tn^ ti> me to be typical lcatherinat and certainly one "f the original series since 

 there i- clinging to il the -tunc kind of sand that is attached to the other examples 

 as douglasi is therefore a Bynonym of iatherina*. (PI. :<:t, 6 

 In his description of the specimens of /■«■ Perrier (p 88) writes that the 



adambulacral spines are in a singh series along the furrow margin Thi- i- simply 

 an ern>r of observation, for his description was not taken from one but from several 

 specimens, since he says: "Void [a description dee indwidus auxquels doit fitre 

 :\t', selon nous, le nom <!' Astoria* katherinae, la description de Gray ayant 

 t'\ idemment fite" faite d'apres eux." In none of the authentic examples are the spine- 

 lets in s single series. This mistakes was unfortunate since it led Verrill to infer the 

 existence of a second set of 6-rayed asterids having monacantbid adambulacralB, 

 which In- named A-ttr',i< dvbia (1909, p. 545 . Inter PUasUr grayi 191 t. p, '.'7 No 

 Buch second Bel exists, however, -o that these names must be regarded as Bynonyms of 



k-'ltherii 



Rays six; exceptionally five; size rather large Closelj resembling a 

 thick-rayed /.. polaris having irregularly and well Bpaced abactinal spine- Diffi 

 from /.. polaris acervata in lacking convex groups of abactinal spines, and from forma 

 la in having smaller straight pedicellariae and more widely spaced abactinal 

 spine- Abactinal spines very irregularly arranged, sparser than in acervata, clavate, 

 subcapitate, with the ends finely grooved; carina] spines not clearly differentiated; a 

 single row of superomarginal, one of inferomargmal, and two of actinal -pine-, bud- 

 cylindrical, often slightly clavate, robust: adambulacral spines normally one and 

 two alternating, the furrow spines of diplacanthid plates slenderer than the otl 

 and more advanced into furrow than that of nionaeant hid plate-: \ery DUmei 

 -mall ovate or broadly lanceolate Btraight pedicellariae K l 5 to 



Description The measurements of the type. No 38.7 L5 107, British Museum 

 Register, are as follow-: K i 15 mm., longest ray and 137 nun shortest raj ; r J7 or 

 28 mm.; R t.9 to 5.3 r: breadth of ray at widest part, just beyond base, 28 to 31 

 mm. ; height of disk, 20 mm Measurements of cotype No 38.7 15.111: K 1 48 to 155 

 mm.; r 33 mm.;B 1.5 to 4.7 r; breadth of raj at widest part near base i ray depn 

 in drying 33 to ■>•", mm. 



The abactinal Bpinea are numerous, not large, unequal, and arranged irregularly 

 on thc> irregular reticulum of dorsal plates Thej are shortest on the radial area, 

 where the primary or principal spines are al>out l to l B mm long, increasing gradu- 

 ally to 2 or 2 5 mm on the dorsolateral surface of ray The irregularly arranged 



radial plate-, and to a 1.-- extent the adradial plat.,, carry, in addition to the principal 



spine, w bich is thick-set, cla\ ate or capitate, ami longitudinally striated at the globose 



■ •I 3ubtruncate tip. three to seven -mailer but usually relatively slenderer .■> 



