L8TER0ID] \ "l NOBTB PACIFIC AND aDJACENI WATERS FISHER. o7 



Papulae usually uol conspic s, one or two to the abactinal area otly 



only one in small examples); two, three, or lees often four intermarginallj (one or 

 two in small examples); one to three in actinal areas, The skeleton i- somewhat 

 more compact, less open, than in arctica and the papular areas are consequently 

 smaller. 



Straighl pedicellariae. (PI 10, Bg 9. A few relatively large unguiculate 

 pedicellariae are present on the abactinal surface, especially near the interradii, 

 in the intermarginal and actinal channels, and in the actinal interradial channeL 

 Those of the abactinal Burface maj be nearlj or quite as long as the slender Bp 



mill considerably Btouter. Similar bul smaller pedicellaria cur on Bon f the 



Buboral and proximal adambulacraJ Bpines but uol al nil constantly. Smaller pedi- 

 cellariae without teeth bul with a notch in the end "f one jaw, and the tips of the 

 jaws crossed, are abundant, us in arcHea, along the furrow face "f the adambulacral 



plat. 



Crossed pedicellariae very variable in number bul in amaJ] specimens generally 

 few, form a circle around the summit "f the prominent -heath of th<' abactinal and 

 marginal Bpines, and tufts on the outer aide of the actinal and adambulacral Bpines. 

 In mosl of the typical deep-water specimens the pedicellarise are few. In specimens 

 from station _'v">i>, the dwarfed deep-water form, there are only two to five pedicel- 

 laria) Burrounding the dorsal Bpines, four to eight around the marginals, and one to 

 three on the adambulacral Bpines. Typical pedicellaris from Btation 2856 an 

 ured (pi, itt. figs, •'> and 7). The abactinal arc about 0.21 to 0.225 mm. long m the 

 large type 0.20 to 0.25 nun.). The adambulacral may be slightly longer. Sum' of 

 the furrow spine pedicellariaa differ from the abactinal, as in artica, in having a longer 

 terminal denticulate portion when Been in profile. These differentiated pedicellaria 



seem to increase in numbers rather more rapidly than the other-, as the animal 

 grows, and they appear to he less numerous in tin- -pen- than in artica but it i- 



difficult to achieve any degree of accuracy since variation in the total number of 

 pedicellarise is 30 wide. (PI. in, fig. 7.) The crossed pedicellariae are more numer- 

 ous than usual in the large specimen from station 2847 (pi. 10, figs. 5, 5«), and the 

 sheaths carrying them are especially prominent, forming near the tip of -pine a good- 

 si/.ed flange of pulpy tissue carrying t> to 12, or even more pedicellariae, which measure 

 about n .27 mm. in length. The inferomarginals carry upward of 25. In contrast to 

 tin-, the type specimen from station 2851 (pi. 1", fig. 8) has slenderer abactinal 

 spines with only two to five pedicellariae each (0.20 to n..'.") mm. long), and upward 

 of 20 on the marginal -pines. 



Madreporic body small, variable, situated about 0.6 c from enter and with « 

 circle or half circle of spinelets guarding it. 



]'ar ' The general appearance of this species \.u hail that of 



arctica; hut there i- nevertheless con-iderahle dilference in -penmen- from the -nine 



Btation. Some "f the diffareni es, such as the ad robustness of -pine-, i 



been Btated in the description. It may be added that there is diversity in the robust- 

 ness "f the rays as well as in the proportions of K to 1 



The specimen- from the greatest depth, 68 fathoms, Btation 2856, are all small, 

 although most "f them are sexually mature, having well developed gonads. The 

 largest has K _' i nun.; the largest from station 2846, 11 fathom-, ha- K :>."> mm.; that 



G:sitiO— 30 4 



