Eastern Kansas and Nebraska. 173 
associated with it casts of an Amincea (= Pectunculus), figured and 
described by Hall and Meek in the Memoirs Am. Acad. Arts. 
and Sci. Dr. Hayden and the writer have also described from 
there a Mactra, under the name M. Siouxensis, and a Pharella. 
not referring it to the oldest Cretaceous, and in placing it ona 
the oldest Cretaceous of Europe. By looking at our paper 
‘published in the Proceed. Acad. Nat. Sci. Philad., Dec., 1861, 
_ page 418, it will be seen that we there refer this rock to the 
a of the Gray Chalk of English geologists. It will also 
seen there, and in our other papers, that we have, almost 
a the first, maintained that this formation is the exact equiv- 
alent of the leaf-bearing beds on Raritan River, New Jersey, 
oe the inferior member of the Cretaceous rocks of that 
Mr. Marcou also has some remarks on the question of the par- 
allelism of this sandstone and the overlying Jnoceramus beds, 
With the upper part of his Pyramid Mountain section in New 
Mexico e have not: the space to enter upon the discussion of 
here, nor is it necessary. The able review of this 
n 
ogy of Texas, place this question in so clear a light that 
bly no one but Mr. Marcou has any doubts on the subject. 
Note on a new Crinoid, referred to on page 164.--Since the Te- 
— Mnarks on page 164 were in type, Mr. Worthen has sent me speci- 
series of true subradial pieces ; while it differs from the struce 
(Mire (at least the normal) of Ancrinus, in having but two primary 
; » Instead of three, in each ray. “uropean specimen 
Ax. Jour. Sct.—Szconp Serrzs, Vou. XXXIX, No. 116.—Manrcu, 1868, 
23 
