B0ID1 \ "I NOBIS PA< it II \M> UN M I 



spines. The available lime Beams to have gone mt<i p. 

 cations tlmt in some cases the spines have bi en absorbed 



[nieromarginal spines i«" sporadically three), Actinal spill.-- m two 

 three, lot The inner spine, when present 



others. The big specimen from station 4219 hn- sometimes t* 

 spines in the lies of the actinal Bystem, <t ft>nr Mini five ooantin • 



marginals. Forma 4 - has usually three or four, exceptionally fivi 



i>f a. linaU at base of ray. There i- u" oonstanl chasacteristic different .• di l 

 mil: the Bpines in the two formae. 



The adambulacral and oral armature is similar to thai of forma 



The pedicellariae of forma paueiapinut arc like those of bn 

 number within about the same limits Specimens from Nanaimo have an 

 dinary equipment <>f large dentate pedicellariae. The bouquets of adambulacral 

 straight pedicellariae are often very voluminous ami can be extended in Ufa t"> the 

 ends of the papulae which are adja< ent to tin- adambulacral plates Thej ntly 



HtFonl some protection to these papulae and to the tube feet, anion.: which t In- 



peduncles of the l> [uets twine - t. la, lb, i< pi. 7s. | 



pi 79, fig •"> (inferomai 



\l kdreporic body large, exposed, situated i 



Color in life i; — pink with bs • papular areas. There ntly 



no constant difference in color from t \ specimen from station t" 



■ tinal Bpines light rose purple; general surface olive huff: papular areas dark 

 grayish green; actinal surface, li'.'ht rose purple 



ng. Plate 86, Figures 12 16 Thee re intended to facilital 



parison between the young of the three species of Pisaster. 



• young, by reason of the paucity of dorsolateral spines, are all referabli 

 fori: Forma i • - 1 1 ■ ■ I add 



while the adults of pa rintein the juvenile at eral 



ire 12 Iih- K 15 mm. and one Bctin for half the length of 



The furcate and crossed pedicellariae are spaced, in ■ round th< 



and fore of two or three in between. Figun R30nun 



• ctend nearly to tip "f raj . Both have relative!] f< w dent ellariae. 



..ns of di the tln> ■ 



from mil 7 the furcate \ edi( ellariae, the jaw - of which are chant U i 



of differ* ni e betwi en the >k< 



are seated upon plates much larger and mon than ;l Mine 



development is seen in oehraceut forma n< In both s| n is 



;. during the growth of ti l.\ ihe addition of internal 



This is especially observable in a uperactinal parti) but- 



.% 1 1 1 « ■ 1 » jia-* from the ambulacra! to the superomarginal 



reen these partitions into which the highly import 



actinal papulae open 



The mouth plates appear to be sunken in thi - than in 



iblo movement is possible rent When the 



actinostome is Dear the upper surface of the <h~k. a- it frequently i-. the •• ana 



