3o6 American Geologist. ^^y- i®®** 
Orophocrinus conicus? W. & Sp. 
Fig. 21. Side view of a specimen apparently of Wachsmuth and 
Springer's species. 
The specimen is beautifully ornamented by lines parallel 
with the plate sutures. It is but little lobed at the summit, 
with ambulacra of medium width and the body slightly con- 
stricted just below the region of the radio-basal sutures. 
The specimen came from the third division of the Lower 
Burlington limestone, Pratt's quarry, Louisiana, Mo. 
A form very similar to this has been found near the top of 
the fifth division. 
Orophocrinus stelliformis? O. & S. 
Figs. 22, 23, 24. Side and summit views of a beautiful little speci- 
men from the soft white chert. 
It is probably the young of O. stelliformis, though it differs 
somewhat from that species. The body is but little lobed above 
and terminates in a basal handle below. The ambulacra are 
short and broad being distinctly petaloid. The spiracles are 
elongate slits while the anal opening enters the test in such a 
way as to make a sharp dent in the peripheral outline. The 
central opening is covered by a roof of small plates that ex- 
tends down each ambulacral center almost or quite to the distal 
extremities. 
From the Cryptoblastus melo horizon of the Lower Bur- 
lington, Cole's quarry, Louisiana, Mo. 
Pentremites conoideus Hall. 
Fig. 25. Side view of a very large, inflated specimen with a base 
not visible in this position. 
Fig. 26 is somewhat like P. elongatus in outline but is a true conoi' 
dens. It came from the Warsaw beds of Mount Newfnan, Kentucky. 
Contrast with the next figure, an elongate specimen with a 
protuberant base. These represent the two extremes in conoi- 
deus, but they are not entitled to specific distinction. 
This is unusually rotund and does not show the usually 
marked difference between the diameter near the summit and 
that at the distal ends of the ambulacra. This specimen was 
obtained from the Warsaw limestone at Grand Tower, Illinois. 
Metablastus lineatus Shumard. 
Fig. 27 is an injured specimen with a portion of the column de- 
tached and lying near by on the slab. The diameter of the stem scar at 
the base of the blastoid bodv is the same as that of the detached col- 
