an axillary, tertiary radial that supports upon one side a sin- 

 gle quaternary plate, and upon the other two quaternary 

 plates, which arrangement gives to each of these rays five 

 arms. There are, therefore, twenty-two arms in this species. 



In two of the regular inler radial areas there is only a single 

 large plate, in each of the other areas there are two jjlates, 

 one large, the other quite small. The azygous area contains 

 four large plates and two very small ones. The first one is 

 in line with the first primary radials and rather longer than 

 either of them. It is followed by three large i)lates, subequal 

 in size, in the second range, and above these, on the left of 

 the central plate, there are two small plates. The azygous 

 area is entirely cut off from the plates of the vault by the 

 union of the quaternary radials. 



The vault is moderately convex and covered with polygonal, 

 highly convex, and nodose plates and bears a large subcentral 

 pi'oboscis. 



This species is distinguished by its general form, twenty-two 

 arms, nodose and subspinous plates and interradial areas. 

 Heretofore, there have been described, from the Burlington 

 Group, ten species, having twenty-two arms, and probably F. 

 proximus is as nearly related to this as any other species 

 lliough the calyx is much shorter and the i-adials differently 

 I' )rinod, and yet thei-e nre more I'cgular and azygous plates in 

 the, several areas than in fliis species, 'fhe two species cannot 

 )>;; confounded by any on(; capable of understanding the struc- 

 t'lre of crinoids. 



l*^ound by C. 8. Hodgson, in the Hurlington (Iroup, in Adams 

 county, Illinois, and now in the collection of S. A. Miller. 



HATOCKINaS NODl.LOSrS, n. .sp. 



Philc 1 , Fig. i, hcisdl view; Fig. 5, azygous side of cdlijr: Fig 

 (I, opposite vieir of calyx. 



I!()(ly nicdiinii or abo\(> medium size. Calyx bi'oadly frunc.alctl 

 below, obconoidal. t\vic(^ as wide as high, arm openings direct- 

 ed upward at a slight angle. Plates spinous. The hexagonal 

 second pi-imary i-adials, two jilates in the second range, in the 

 azygous area, and the sculpturing bring this s))(>cies near -Ir- 

 linacri)ui!<. The iiitcri'iulial ureas, ai'e. however, cut olT I'rdUi 



