348 The American Geologist. J""^- ^''''^^• 
Aorocrinus wachsmuthi, n. sp. 
Plate xxviii. 
Fig. 38. — Side view of the type specimen, natural size. 
This little, crinoid has nodose calyx plates and blunt spinose ven- 
tral plates. The central dome spine, so conspicuous in Dorycrinus is 
represented by a nodose plate in this species. The basal plates form 
a low rim about the top of the column. The first radials are very 
nodos.e and about as long as wide. The second radials are smaller, 
quadrangular pieces. The third plate in the radial series is a bifur- 
cating piece and five-sided, and a little smaller than the second radial. 
The interradials consist of one large noduse plate, upon which rest 
two flattened plates above. The anal interradial area is filled by a 
large plate in line with the first radials and a little larger than them, 
supporting three smaller nodose plates above and resting on the latter 
in turn are three smaller flat plates. The anal opening is on a wart ■ 
like prominence. Three of the arm lobes give off two arms each 
while the right and left anal lobes give off three each, making 12 arms 
in all. The stem base is very small and round. 
We are glad to name this pretty little species for the late Charles 
Wachsmuth of Burlington, joint author with Mr. Frank Spring- 
er of the genus Aorocrinus. 
This crinoid is found associated with Lophoblastns aplatus 
and another Aorocrinus, apparently a variety of A. parva, near 
the top of the fifth division of the Lower Burhn^on hmestone 
at Louisiana, Mo. 
Li our notes on the "Fauna of the Burling-ton Limestone at 
Louisiana, Mo.," A.merican Geologist, Vol. XXVI, October, 
1900, page 247, we mentioned a specimen of Schizoblastus sayi 
with a short proboscis. We here fig'ttrc this h'ttle specimen to 
show this featiu'e. Another specimen has since been found 
showing the same strticture. Figs. 15 and 16; the latter is an 
enlarged view. 
Fig. 30 is a side view of a splendid bodv of Cacfocriniis 
spriiigcri, a crinoid fig"ured and described by the author in the 
Februarv, 1900, American Geologist, as Batocriinis springcri. 
Fig. 31 is a large body, somewhat crushed, with three entire 
arms and parts of three others. The great ventral tube is pre- 
served to the arm tips and furnished with spines. The arms are 
traversed longitudinall}- 1\v short s])iny nodes in rows. Asso- 
ciated with these crinoids are s])inv stems wliich, doubtless, 
belonged to this species. 
