REPORT ON THE ECHINOIDEA MORTENSEN 263 



the point of the spine, which may be broadened to a crown of various 

 sizes, sometimes fairly large. The whole surface of the spine, with 

 its disks and spinules, is covered by a close coating of rather long, 

 coarse, not anastomosing, hairs. The spine as a whole tapers gently 

 toward the point and is more or less distinctly curved downward. 

 The collar is quite short; the milled ring is inconspicuous. The api- 

 cal spines form rather large disks, of oval shape, with rather coarsely 

 serrate edges. They are all eccentric, the adapical side being the 

 larger on both inner and outer circle. The basal disk is scarcely 

 indicated on these apical spines. The oral primaries are short, straight 

 or nearly so, rather coarsely serrate along the sides and, excepting the 

 first, also tuberculated on both the adoral and adapical sides; often 

 they are somewhat widened at the point. The third is transitional 

 to the ambital spines. 



The scrobicular spines are about 2.5 mm. long, broad, flattened, 

 slightly narrowing toward the straight cut end. They curve inward 

 somewhat in their basal part, thus being slightly concave in side view; 

 but they are otherwise flat, not concave on the outer side. The 

 basal part is distinctly spiny. (PI. 78, lig. 12.) The marginal ambu- 

 lacral spines are somewhat shorter and narrower, with straight sides, 

 not curved, but with spiny bases as in the scrobicular spines. Those 

 near the peristome are rather distinctly broadened. The secondary 

 spines are in general rather closely appressed. On the peristome the 

 interradial spines are conspicuously smaller than those on the 

 ambulacra. The miliary spines are very small and conical. 



Large globiferous pedicellariae are found placed more or less regu- 

 larly in the grooves of the interambulacra. They are of the usual 

 globular shape, dark pigmented, and therefore the more conspicuous on 

 the light test and among the much smaller miliary spines. The valves 

 (pi. 78, fig. 9) are of the typical goniocidarid form, but with the blade 

 prolonged more or less conspicuously into a narrow tube, which bears 

 the opening on its end. The stalk is quite short, and without a limb. 

 The small globiferous pedicellariae (pi. 78, figs. 10-11) are rather 

 abundantly developed, with narrow compressed valves which may be 

 more or less elongate, sometimes so much so as to resemble tridentate 

 pedicellariae, especially as in the more elongated examples (head up 

 to 0.3 or 0.4 mm.) the valves are not joined in the basal part. That 

 they are, however, only a special development of the small globiferous 

 type is evident from the transitional forms; in these most elongate 

 forms also the end tooth may still be distinct. The large coarse form 

 of tridentatelike pedicellariae so characteristic of several goniocidarids 

 has not been observed. 



The spicules of the tube feet are of the usual cidarid type. 



The color of the primaries is pure white, as may be determined 

 from one newly formed spine; in the others the white is more or less 



