SHUMARD—BLASTOIDEA, 241 
one-fifth of the length of the pieces. The deltoid pieces are 
small, lozenge-shaped, and rather prominent in the middle. 
ame rbulacral fields are petaloid and nage 5 lodg- 
in the grooves of the radial pieces. They consist of 
ot eighteen to twenty pore pieces, which are Jivided i into 
r prominent lobes by several oblique furrows, which run 
as from _ inferior edges to within a short distance of 
superior on 
The specimen saoeed exhibits at the summit a ce cen 
form. (mouth), which is surrounded by five 
ovarial apertures, situated just within the extremities of the 
interradial pieces. The covering plates of the apertures have 
y 
eli h, 0.82; width, 0.12; le of-tinse, 
0.10; width of sam 2, 0.0%... a 
For the favor of Reker permitted to make known this ‘ata 
_ Species we are indebted to H. C. Grosvenor, Esq., 
oa ar eg it from the Archimedes Limestone at t Sper 
cafes It is very rare, the specimen fi 
only a that has been found. Itis associated with Pidive- 
‘mites conoideus (Hall), and Dichocrinus simplex (Shumard). 
Paxman 3 LINEATUS. 
not 
