286 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



beadlike granules; the adradial and next adjacent series with 4 or 5 

 granules and usually no central; the interradial plates with 4 to 6 

 g;;in;i]es. A ver\^ few of the radial plates of type (only) have a deli- 

 cate pedicellaria with 2 slender jaws longer than the granules. 



Superomarginals massive proximally, 22 on longest ray, forming 

 an arched bevel to the margin of interbrachial spaces. Base of ray 

 very slightly arched abactinally — nearly plane — but v;itli a well- 

 rounded, abrupt, slightly swollen angle between the dorsal and lat- 

 eral facets of the plate. On outer part of ray the dorsal surface is 

 arched so that the distal attenuate portion of ray is subterete. Proxi- 

 mally the height of the plate is about half the width of dorsal sur- 

 face, and distally about equal to it. The third plate is about as long 

 as wide, but thence the width decreases more rapidly than the length, 

 so that all the subsequent plates are longer than wide. Granulation 

 coarse; granules circular, depressed, subtruncate or convex, and 

 spaced slightly less to slightly more than their own diameter apart. 



Inferomarginals slightly tumid and very narrow on the ray, and 

 all iM\' longer than width of actinal surface. Inner edge of first j)late 

 about as long as chord of extreme width, or exceeding width of ven- 

 tral surface alone; second plate slightly narrower; third plate one 

 and one-half times as long as wide. From here the plates become 

 rapidly narrower; and the surface being evenly rounded from the 

 inner to outer edge, they resemble short terete rods placed end to end. 

 Ten inferomarginals near center of ray correspond to 15 or 16 adam- 

 bulacrals. On the outer part of ray the inferomarginals are about 

 as wide as the adambulacrals, and about half as wide as ~he siipero- 

 marginals. In the interbrachia and along proximal half of ray the 

 lateral suture between superomarginals and inferomarginals is 

 slightly depressed owing to the slightly swollen lateral facets of the 

 plates. Granules subspherical, slightly smaller than the superomar- 

 ginal granules and similarly spaced. Proximally there are about 9 

 in the length of a plate ; distally about 7 or 8. 



Actinal intermediate plates in 3 chevrons, the outer reaching mid- 

 dle of second plate. Granules thimble-shaped or acorn-shaped, spaced 

 about as those of inferomarginals and similar to them in size. 



First 2 adambulacral plates without perceptible furrow angle and 

 with 7 or 8 rather slender 4-sided spines of about equal width through- 

 out, but tapering to a subtruncate tip somewhat like a wedge. Third 

 plate with angle near proximal side, which rapidly increases in promi- 

 nence until the sixth to eighth plates, beyond which there is a gradual 

 broadening of the apophysis, as the plates become much narrower 

 owing to the tenuity of ray. As a consequence of this the plates are 

 much longer than wide, the apophysis is broad and less prominent, 

 so that the circular compartments in which the tube feet are lodged 

 are separated by more than their own diameter. Where the apophysis 



