wn k. \ 01 NOBTB PACIFIC wi> U'.imivi WATOBS ii-iikii 99 



and become slenderer. In the median part of the my the Bubambulacral spines nn' 

 cylindrical, <>r slightly clavate, round-tipped The furrow spines up- slenderer nnd 

 tapered. There are three pairs of contiguous plates back "f tin- mouth pi"' 



Mi hi ih plates very similar to those < »f camtschatica. There are i wo actinoetomial 

 Bpines and one auboral. The Bmaller of the two apical spines is bent across t h.- !>• 

 oing «>f the radial nerve The other, about twice as long -' nun i, is a trine loi 

 than the median oral Buture. 



The -tin- of actinal, intermarginal, and Bupramargina] papular areas are regular, 

 l>ut the other dorsolateral areas are not al all regularly arranged They vary greatly 

 in Dumber according to the age of the specimen and appear ool to be of di 

 value There are only a few papulae t<> each group. In small examples thej are 

 mostly single 



Straighl pedicellariae are all small and are of 1 1 1« - lanceolate and ovate com- 

 pressed type, quite inconsiderable in bulk as compared to the Bpines. The <l<>rsal 

 arc commoneel interradiall] and along the supramarginal channel, and arc laneeolate- 

 te, or ovate, blunt, or subacute; the intermarginal and actina] arc similar but a 

 little larger. They occur in clusters on the oral spines and among the crossed pedi- 

 cellariae of the furrow Bpines 



Crossed pedicellariae, distributed as in nitida, are fairly numerous in large speci- 

 mens, but few. especially on the abactinal surface, in small one- Their SIM varies 

 with that of the specimen On large examples they measure 0.25 to 0.27 mm (Fl 

 42, figs, 1". 46.) 



Madrepoiic bod] circular, situated at about the middle of r, surrounded by a 



complete or an incomplete ring of short capitate Bpines. Striae rather coarse, radiat- 

 ing from center 



In small specimens, as \ en-ill states, the ambulacra! groove is bioad. 

 feature maj be masked by the arching of the abactina] Burfa< e bo thai 



the furrow arc draw n togethei 



Anatomical notes.- In small specimens the carina! and Buperomargina] plates 

 are disproportionately large .-i- compared to the irregular dorsolaterals. The triserial 

 arrangement of the dorsal plate-, mentioned by Verrill, i- lost in large example- by 

 the interpolation of plates between the carinals and the primary dorsolateral w 

 uhat which borders the Bupramarginal channel). In typical large example- such as 

 that from Attn, the carinals are. nevertheless, -till relatival] large PI 19, fig 



The gonads open ventrally The aperture- are close to the interradial line, and 



in line with the outer actinal low of papulae Each is at the -uniniit of a low promi- 

 nent papilla, and the specimen R 57 mm taken at Attn. June 10 11, 1906, baa 

 large but BubBpherical, nodular ovaries filled with rip ■ Another large -pec mien, 



that described, taken Maj 29, IS \ttu. i- a male and the gonads are of the 



branched type common in the mules of this genus The gonads appear to be not 



fully mature A mature female, taken June 16, 1920, at I nala-ka. ha- K only 26 mm 



Variations.- The small typical Bubforma as described by Verrill is unmistakable. 



but this i- an extreme having a minimum nf abactinal spines and usually on.- - 



of prominent Buperomarginal Bpines The carinals are few and unusually largi 



if there were only a certain amount of lime to In' expended the larger the -pine- 



the fewer their number In larger specimens the number of i annal spines \ 



