Neiv Missouri Critioids, Eic. — Rowley. 73 
This' crinoid differs from all other species of Batocrinus in 
its inconspicuous basals, the peculiar nodose character of its 
calyx plates, the great hight of its vault, fewness of calyx 
plates and general appearance; more nearly approaching 
Cactocrinus in the latter feature. 
This peculiar crinoid is found near the top of the Lower 
Burlington limestone at Louisiana, Mo., associated with 
Agaricocrinus planoconvexa, Granatocrinus aplatus, Ichthyo- 
crinus burlingtonensis. The species is doubtfully referred to 
Batocrinus. 
Eretmocrinus nodosus, (nov. sp.) 
Fig. 17. Side view of the body, natural size. 
This fine crinoid has the prominent base and inflated ven- 
tral region of the genus Eretmocrinus. The first radial plates 
are large and hexagonal, the second quadrangular and the 
third cr axiliary plates pentagonal. The first plate of the 
secondary radial series is a bifurcating plate. The fitst inter- 
radial is nodose and upon it rest two smaller plates. The first 
anal interradial is on a line with the first primary radials and 
has three nodose plates resting on it above. 
In some of the specimens all of the dorsal as well as all 
of the ventral plates are nodose, almost spiniferous. In other 
specimens the basals, first radials (but not the second), the 
axiliary plates, first interradials, four of the anal interradials 
and most of the vault plates are nodose. The three basal plates 
form an expanded rim. The base of the proboscis is mod- 
erately strong. Stem large. Arms and pinules unknown. 
Basal perforation small. Arm openings about 20. The speci- 
men figured is of medium size as one of the types is nearly 
twice as large. 
It occurs in the basal layer of the Upper Burlington lime- 
stone at Louisiana, Mo., associated with Granatocrinus rtiag- 
nibasis, Schizoblastus sayi, Codaster grandis and Cactocrinus 
glans. Our species bears a superficial resemblance to Bato- 
crinus pistillus. Fig. 5, Plate 4, Part III, Revision of the 
Palaeocrinoidea by Wachsmuth and Springer, is a drawing cf 
a natural cast from chert of this species and not of Dory- 
crinus missouriensis, as stated by W. & S. 
