80 VERRILL 



margins of the grooves. Those of the actinal side and ambulacral 

 furrows are mostly acute-lanceolate or acuminate, compressed, with 

 the sharp curved tips often overlapping. They often exceed the 

 adambulacral spines in diameter. Those of the dorsal surface are 

 shorter, stouter, ovate, with narrow obtuse tips, which are slightly 

 denticulate. Those on the intermarginal furrow are largest and 

 stoutest, with stronger denticulations. 



Minor pedicellariae are very small. They form small wreaths 

 around most of the dorsal spines, and clusters on the outside of the 

 ventral ones; small clusters also occur on the inside margin of the 

 adambulacral plates and on some the larger major pedicellariae. On 

 the dorsal surface they form mostly rather small clusters, pretty 

 evenly scattered over the whole surface; in large specimens they 

 often become very numerous and pretty evenly distributed. 



The papulae are very small and apparently not very numerous, 

 except in large examples. The integument is thick and firm, so that 

 it conceals the outlines of the plates. 



The mouth is deeply sunken. The jaws are elongated, narrow or 

 much compressed, nearly perpendicular within; the adoral spines 

 form two close rows of about eight each ; the apical oral spines are 

 rather stouter than the rest ; there is often but one to a jaw. 



The color, in the only case noted, was pale purple or pink. 



A good specimen from off Monterey, Calif. (No. 18290, M. C. Z.), 

 differs somewhat from all the others. Radii, 33 mm. and 130 mm. ; 

 height in middle, 40 mm. 



The central and ten primary radial and interradial plates are 

 covered with clusters of short capitate spines with obtuse tips, about 

 eight to ten in a cluster. About ten smaller plates within the pen- 

 tagon are indicated by small clusters of simple spines. The median 

 radial rows are conspicuous. On the proximal third of the rays they 

 mostly contain three regular rows of spines; further out the three 

 rows are less regular. On the distal fourth there is usually but one 

 row. The other dorsal spines are mostly grouped in clusters of three 

 to six, the clusters being irregularly scattered, largest on the sides 

 of the rays. The spines are all similar, short, thick, with more or 

 less conical, obtuse or ovate striated tips. The marginal and actinal 

 rows of spines are very regular and even. They stand in close rows. 

 There is a wide and deep intermarginal channel. The superomar- 

 ginal row of spines is simple. The inferomarginal row is double. 

 The two interactinal rows are simple and nearly equal. 



