152 The American Geologist. March, 18W 
onal. In two of the areas two plates vest on the upper Bides 
of the first interradial and first radial, while in one area three 
such plates are above the first. There seem to he about ten 
plates in the anal interradius, but this can not be well made 
out from the disordered condition of the radial series to tin- 
left. All of the calyx as well as the vault plates are slightly 
convex but without spines and radiating ridges, except at the 
edges where short connecting ridges give a pitted character 
to the lines of union. 
Vault pieces numerous. Base of proboscis medium, excen- 
tric. Base of the free rays prominent, giving an actino- 
crinoid look to this beautiful speeies. Top stem joint rather 
large. 
Collected from the Hamilton group of Callaway Co., Mo., by Mr. D. 
K. Greger. Type in the author's collection. Hight of type 1 1 of an 
inch. Width at vault La. 
1 (5 
JlelocrimiK lylii. (n. sp.) 
Fig. 2. Side view of the type, natural size. 
This is the smallest crinoid yet discovered at the Callaway 
locality. Three of the basal plates are quadrangular and the 
fourth pentagonal, slightly projecting outward. Three of 
the first radials are heptagonal and two hexagonal ; width 
and length about equal. Second radials hexagonal. Third 
radials heptagonal, supporting above two series of two small 
plates each. Interradial series twelve to thirteen, arranged 
as usual in this genus. First interradial about ;is large as the 
second radial piece and hexagonal. Anal interradius com- 
posed of twelve pieces, all being small with the exception of 
the lowest piece. 
All the plates of the calyx of this little crinoid bear a cen- 
tral short spine and strong radiating ridges connecting the 
centers of all the plates, giving the specimen a very handsome 
appearance. 
Vault plates numerous, almost spinose and having the radi- 
ating ridges. Proboscis slender, excentric. Free rays, arms 
and column unknown. 
Specific name given in honor of Prof. J. N. Lyle, of Westminster 
College, Fulton, Mo. Collected from the Hamilton beds of Callaway 
Co., Mo., by Mr. D. K. Greger. Type in the author's collection. Hight 
of type A_ of an inch. Width at vault JL-. 
