0 



Basals form an hexagonal disc twice as wide as the diame- 

 ter of the column and having a height less than half the dis- 

 tance from the column to the margin. First primary radial s 

 one-half wider than high, and superior face nearly straight, 

 Second primary radials quadrangular, about three times as wide 

 as long. Third primary radials pentagonal, a little larger 

 than the second, about three times as wide as long, axillary, 

 and support on the upper sloping sides the secondary radials. 

 In the ray opposite the azygous area there are three secondary 

 radials on one side and an axillary plate that bears two arms; 

 on the other, there are two secondary radials, the last of 

 which is axillary and bears, upon one side, a tertiary plate, 

 which supports a single arm, and upon the other a tertiary 

 plate, which is followed by an axillary plate that bears two 

 arms. There are, therefore, five arms in this ray. One of 

 the lateral rays is constructed in the same manner and bears 

 five arms. In the other lateral ray there are two secondary 

 radials in each series, the last of which are axillary and bear, 

 upon one side, two tertiary radials that support a single arm 

 on each, and upon the other side two tertiary raidials, the last 

 being axillary and supporting two arms. There are, therefore, 

 six arms in this ray. The ray on the right of the azygous 

 area also supports six arms, while the ray on the left of the 

 azygous area supports seven arms, the proximal one being a 

 single arm and the other three double arms. By this arrange- 

 ment there are twenty-nine arms in this species. The arms 

 are long and very slightly flattened toward the superior ends. 

 Pinnules very dense. 



In the regular interradial areas there are only two plates, 

 one following the other. In the azygous interradial area the 

 first plate is heptagonal, in line with the first primary radials 

 and of about the same size. It is followed by three plates in 

 the second range, which nearly fill the area, above these the 

 sutures are indistinct in each of our specimens, but, appar- 

 ently, there is only one plate, making five plates in this area. 

 The vault is not disclosed in our specimens, but two of them 

 show the broken ends of the proboscis, which is quite small. 



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