Basals form an hoxap^onal 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 radials 

 one-half wider than higli, and superior face nearly straight. 

 Second primary radials (juadrangular, about three times as wide 

 as long. Third i^rimary radials i^entagonal, a little larger 

 than the .second, about three time.^ as wide as long, axillary, 

 and support on the upper slojiing 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, live arms in this ray. One of 

 the lateral rays is constructed in the same manner and bears 

 live 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 ui)on the other side two tertiary raidials, the last 

 being axillary and sujiporting 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 ai-ea supports seven arms, the jiroximal one being a 

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

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

 are long and very slightly ll:itten(>d toward the superior ends. 

 Pinnules very dense. 



In the regular interradial ai-(';is Uwvo are only two plates, 

 one following the other. \n tlir azygous interradial area the 

 first plate is heptagonal, in line with the first primary radi;ils 

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

 the second range, which nearly fill the area, above thesi; the 

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

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

 The vault is not disclosed in our sjiecimens, but two of tlieu] 

 show the broken ends of tin,' pioboscis, which is ([uite small. 



