242 TRANS. OF THE ACAD. OF SCIENCE. 
Owing to the crushed state of the only specimen we have 
seen of this species the structure of the summit can not be 
further determined. From the — ti the figure more 
sents the species much wider than natural. 
imensions.—Le: Ths width pe 0.26; length of 
base, 0.25; width of same, about 0.1 
This Pentremite cannot be Soaaen for any species hith- 
erto found in our Carboniferous strata, but it is — allied 
to Pentremites sige ee (Troost), an Upper merch 2 
cies from Tenn Our fossil is, however, ia sle 
and the pseudo-ambulacral fields reach down to the middle 
of the radial pieces, while in the P. Reinwardtii they extend 
— about one-fourth the length of these pieces. : 
or the amen ee of describing this rare species I am in- 
debted to Henry M. Maikes: M.D., who has kindly od 
it in my hands for this purpose. It was found in the 
nital Limestone near Monmouth, Illinois, where it occurs with © 
eee a Megistocrinus Evansi, Actino- 
Penman DECUSSATUS, JV. sp. ; 
we ie a 6 - Pei . 
