61 



The first azygous plate broadly truncates a subradial, the 

 sides are nearly parallel, and it supports two plates in the 

 second range, one of which only slightly truncates an angle 

 on the left, while the other rests upon the longer, superior, 

 inclined side and supports a series of rather large convex 

 plates. On the right of this series there are some small 

 plates that unite with the primary radials, above the first 

 plate, and on the left there are larger plates connecting the 

 plates with the primary radials. The area curves into the 

 vault so rapidly that none of the plates are shown in our spe- 

 cimen beyond the fourth range. 



This species will be readily distinguished from all others, by 

 its general form, and one hundred arms. If Taxocrinus is dis- 

 tinguished from Forbesocrinus, by supporting, in the azygous 

 area, a central or subcentral series of plates, this is a Taxo- 

 crinus, but if that is not the generic difference, it might as 

 well be called a Forbesocrinus. 



Found in the Keokuk Group, at Crawfordsville, Indiana, and 

 now in the collection of Wm. F. E. Gurley. 



TAXOCRINUS SPLENDENS, n. Sp. 



Plate V, Fig. 3, azygous area on the right; Fig. A, opposite side of 

 the same specimen, which is compressed. 



Species medium size. The radial series stand out from the 

 interradial areas and are broadly rounded. Interradial areas 

 depressed. There are sixty arms infolded at the summit. The 

 middle part of each plate overlaps the inferior plate externally, 

 in a sinuous line, which is more conspicuous than usual in 

 this genus. Surface pustular. Column tapers very slightly 

 from the calyx where it is composed of very thin plates. 



Basals within the calyx. Subradials medium size. Primary 

 radials, four in each series, and they gradually widen from the 

 subradials to the secondary radials, which is the reverse of 

 what we usually find in this genus. They do not increase, 

 correspondingly, in length. The last ones are axillary and 

 support upon the upper sloping sides the secondary radials. 

 There are three secondary radials in each of five series and 

 four in each of the other five, as follows: In the ray on the 

 left of the azygous area three in each series; in the ray on the 

 right and in the ray opposite the azygous area four in each; 

 in one lateral ray three in each, and in the other lateral rays 

 three in one and four in the other. The last ones are axillary 



