As'l 1 ROIDl \ "t NOBTH PACIFIC UTO IDJACENI WATS] Ml 



Straighl pedicellariae. (PI. 31, fig. 4; pi. 82, liL--. I, la la.) Coi 

 Buboonioal, heavy, round-tipped pedicellariae with three or four, occasionally 

 terminal teeth are abundant abactinally, especially toward tin- sides of the area, on 

 the marginal and aotinal plates, and also Bometimea on the bases of the Bpines 

 have broad, beavy jaws with t li !■»'•• or four teeth and the back of the jaw sometimes 

 grooved, while in others the jaw rapidly tapers and t hi- end is pointed with only two 

 or three teeth, or even without teeth. The hea\ ier band might be described a- broadly 

 wedge-shaped. The largest measure 1.15 mm, long by 0.8 mm. broad at base 

 \iiu i, I » 1 1 1 many lateral and aliactinal ones are <mly 0.7 nun long. Smaller, broadly 

 lanceolate, compressed pedicellariae of various sizes down to that <>f tin' crossed Bort, 



i on the adambulaeral spines (especially those bordering furrow i ami oral Bpines; 

 and others, also small ami lanceolate, or lanceolate-ovate, occur on the actual ami 



furrow fare of the adambulaeral plates. 



Crossed pedicellariae (pi. 31, figs. 2, 2a .v. :;.:;</ :;/<! air very abundant, forming 

 beavy wreaths around all the aliactinal and superomargina] spines, ami three-quarter 

 or half wreaths around the inferomarginaJ and actinal spines, filling up practically all 



the space between the Bpines. The adambulaeral spine- air provided with 



clusters, and the pedicellariae are of different form from the abaotinal, the jaw baving 

 a longer cutting edge. These are a little narrower than the corresponding pedicellar- 



'n and /'oh/tin In. A- compared with typical poiaris, northern act 

 and /nib/tin In , the side view of the aliactinal pedicellariae -hows the lip extending less 

 far down on the -hie of the jaw. Aliactinal pedicellariae measure about 0.27 mm. 

 long, while the adambulaeral are about 0.33 to 0.45 mm long, the larger I I 



numerous. 



The madreporic body is circular, alightly convex, an. I situated about mid r. 

 ■in/nielli nulls. The abactinal plate- are very numerous, irregularly lobed, 

 and form a very close, irregular reticulum, the irregular -paces of which arc usually 

 -mailer than the primary plates. The supramarginal Bpaces an- a little larger than 



the plate- About 1.", to Is of ihe space- can be counted across the base of the ray 

 between the two superomal u r inal series of plates, and about the same number of 



larger plates, although the plate- are so unequal in -i/.e and irregular in distribution 



that there is no accurate method of computation. The supeiomarLrinals are a little 



larger than the largest abactinals, are four lobed. and imbricate Btrongly, all being 

 Bpiniferous The inferomarginals ami actdnals are amaller, decreasing in size toward 



the furrow and are strongly united by their internally carinate dorsoventral lobes. 

 The ambulacra] ossicles are moderately compressed, there being 10 in the -pace of 



10 mm. (at the base of the ray I. 



The ovaries of the type are rather large spindle-shaped organs subdivided into 



many lobules. They taper to a point and are therefore similar in form to tho 



<n ami unlike the somewhat globular or sausage-shaped ovarie 

 ehatiea ami allies The ovarj i- attached rather low on the septum and the duct 

 turns downward, a- m other members of the genus, to open ventrally, althi 



apertures are not visible on this particular specimen 



I'// This forma is divisible into at least two groups which ma\ ha 



different origin. The typical form has \,i\ numerous, close-set abactinal sp 



ral Buperomarginal Bpines to each plate, ami large bivalved straight pedioells 



