■BaSai coneai'ity pentagonal, funnel shaped, and without orna- 

 iiV^iitatioh. Basal plates form a liollovv cone within the calyx, 

 into which the end of the cohunn is inserted. F^irst ]iriniary 

 i-dtfials as long as wide and alirujitly bent in the middle, the 

 lo'we'f pSrt fofming part of the funnel-shaped columnar cavity, 

 a'rid' the superior end curving as abruptly upward. The plates 

 ate' pyramidal, with the apex at the center, and radiately sculp- 

 ti'Ui*'ed.' A furrowed ridge extends from the ajiex of one plate 

 to'the 'next,' wTiich forms the ])entagonal outline of the basal 

 concavity 'and on which the calyx will rest if placed on a 

 lev'el surface. Secdnd primary radials quadrangular, about 

 o'le-Iourth' wider than long and sides nearly parallel. Third 

 primary radials smaller than the .second, one-half wider than 

 Idfig',' i^ehtagonal, axillary, and in four of the rays support 

 on each upper sloi^ing side two secondary radials, which gives 

 to each of these rays two arms. In the ray adjoining the 

 azygous area on the right the third primary radial supports 

 on the proximal side three secondary radials, and on the dis- 

 tal sicle of a secondary radial that is axillary and supports 

 upon each upper sloping side two tertiary radials which gives 

 in thiti Tay three arms. There ai-e, th(>refore, eleven arms in 

 tliis sjjccies. The arms are compos(^d, at the base, of a single 

 Kea;ies .ol plates- ■ 



iln the, rregulp^r interradial areas there are only two plates, 

 but. the azygous area is wider in the superioi- part and con- 

 tains three plates. The first interradials are large, ])yramidal 

 ajad. -radiately sculptured. The sec-ond jjlate is (luite small, not 

 more; than one fourth as large as the first and it connects with 

 two plates belonging to the vault. The first azygous plate is 

 like a regular first interradial and is followed by two plates 

 in the second range that unite witli tliree plates hclonging to 

 the, -vault. 



The vault is sharply elevated over the ambulacral canals and 

 deeply .depret^sed in the interambulacral areas. The azygous 

 o^'ificc i? Qlevated at the central or subcentral part of the vault, 

 t)ut can hardly be said to be at the summit of a jirobo.scis. 

 Th\V.vault is covej-ed with ])<)lygonal ])lates. which, in our 

 s[>^piu^ens, sliovv no suitacc oruaiucutation. 'i'he ovarian ]iores 

 appear to l)c witliiu tlir l;i,st plates belonging to the calyx. 



