34 



range, then our small sunken square plate and one nodose 

 plate, and above these two plates thai unite with the plates of 

 the vault. 



This species is distinguished by its general form and surface 

 ornamentation from all other described species. It is again 

 distinguished by having all the interradial and intersecondary 

 radials connected with the vault, and bearing twenty arms. A 

 basal view will distinguish it from all other species. 



Found in the Burlington Group, at Sedalia, Missouri, by 

 Miss Jessie lilair, an accomplished scholar and student of 

 Geology, for whom we have proposed the specific name. 



Family POTERIOCRINID./E. 



ZEACRINUS PECULIARIS, n. sp. 



Plate II, Fig. 17, azygous area on the left, specimen compressed '; 

 Fig. 18, opposite side of ihe same compressed speci- 

 men; Fig. 19, basal view of same. 



Species rather above medium size, and when not compressed 

 elongate-elliptical in outline. Calyx very low. Columnar cavity 

 rather deep. Surface finely granular. Column small, round 

 and having a minute columnar canal. 



Basal plates within the calyx, the hollow conical cavity be 

 ing tilled with the end of the column. Subradials have rather 

 acute superior angles but they are not visible in a Lateral view. 

 First radials only a little wider than Long, the inferior angles ex 

 tend into the columnar cavity, the plates expand to the superior 



lateral angles ami are truncated tl mire width above for the 



support of Ihe second primary radials. Three are pentagonal, 

 and the two adjoining the azygous area are hexagonal. They 

 are separated from the second primary radials externally by 

 slightly gaping sutures. The second primary radials are a Ii1 

 tie shorter than the first, bu1 wider as thej continue the same rate 

 of expansion possessed by the firsl as far as the superior lat- 

 eral angles. Three are pentagonal, tin e on the left of the 



azygOUS area hexagonal, and these four are axillary and sup 



port on each superior sloping side the secondary radials; hut 

 in the ray opposite the azygous area there are three primary 

 radials. consequently the second one is quadrangular. It is 

 about Iwo ami a half times as wide as long. The third one is 

 smaller than the second, pentagonal, axillary and supports on 

 the upper sloping sides secondary radials. In the ray on the 



