The Fauna of tJic Barlington Lj/nesto/ic. — Rowley. 249 
Granatocrinus? magnibasis is a rare species, confined to 
a horizon less than a foot in thickness at the very base of the 
Upper BurHngton Hmestone. It is easily known b}' its con- 
cave summit, very large convex base, narrow elevated am- 
bulacra, small deltoids and wrinkled character of ornamenta- 
tion. Internal chert casts of this species have extravagantly 
elevated ambulacral ridges. 
Associated with Magnibasis is Granatocrinus calycinus, a 
very small blastoid with flat or slightly concave base, fine 
granular ornamentation and rather wide prominent ambulacra. 
It resembles G. pisum from the Lower Burlington, in outline 
only, as it has much larger deltoids, broader ambulacra and 
is a much smaller form. 
Granatocrinus pyriformis is from White Ledge, Mo., but is 
specifically near to G. magnibasis. 
Of all the Burlington blastoids, Granatocrinus stella is the 
rarest and most peculiar. It is associated wuth G. calycinus 
and G. magnibasis and may be known by its strongly stellate 
form. Natural casts of this species from chert are almost dis- 
coidal in outline. Like G. magnibasis, with which it is con- 
generic, it has a concave summit, large convex base and a 
linear ornamentation. 
From the top of the Upper Burlington chert come two 
casts, one of which may be Granatocrinus excavatus with del- 
toids fully as long as fork pieces, granular ornamentation and 
concave base. The other is a small elongate form with large 
deltoids and slightly concave base, probably a new species, 
congeneric with S. sayi. Granatocrinus melanoides and G. 
shumardi are not recognized among our blastoids. 
Codonites whitei is very rare and from the bottom of the 
4th or top of 3rd Lower Burlington horizon. From the same 
strata comes Codaster gracillimus, a rare form, recognizable 
by the short, narrow ambulacra, confined to the summit. The 
largest and most desirable blastoid from the Burlington is 
Codonites or Orophocrinus stelliformis. which ranges from 
the bottom to the top of the 4th Lower Burlington horizon 
but is never common, having its greatest development near 
the top of that bed and associated with Cryptoblastus melo 
On old specimens of this species the linear ornamentation 
hecomcs cordlikc. and the underside of an ambulacral rav 
