BATOCRINID &. 507 
whole calyx, a peculiar and unique character. Posterior oral strongly 
nodose, and almost as large as the four others together; it occupies a slant- 
ing position, leaning over to the anterior side, where it occupies a lower level 
than at the posterior side. ‘The smaller orals and radial dome plates highly 
convex, about twice as large as the intervening perisomic plates. Interam- 
bulacral pieces seven to nine to each side, slightly convex. The column, 
which has been observed to the length of nearly eighteen inches, retains the 
same width to the end. The nodal joints throughout are considerably wider 
and longer than the intervening ones, and at about 10 cm. from the calyx 
the internodes have increased to six joints, which is probably the largest 
number in this species. Farther down on the stem, larger and smaller joints 
alternate with one another. 
Horizon and Locality.— Upper Burlington limestone, Burlington and 
Pleasant Grove, Iowa. 
Type i the White collection at Ann Arbor, Mich. 
Remarks, — This species is readily distinguished by the peculiar construc- 
tion of the anal area, the asymmetry of the calyx, and the flatness of the 
dorsal cup. 
Agaricocrinus bellatrema, var. major W. and Spr. (nov. var.). 
Plate XLI. Fig. 5. 
This form differs from the typical A. bellatrema in the size and form of 
the calyx, which is larger and depressed-spheeroidal in place of subpyramidal, 
the dorsal cup being slightly more convex, and the ventral disk shorter. As 
a rule, the plates of both hemispheres are more tumid, but especially those 
of the ventral disk, which throughout are sharply nodose, the interambu- 
lacral pieces as well as the others; and all plates, excepting the posterior 
oral, are of about uniform size. The plates of the dorsal cup are but very 
slightly convex. The construction of the anal area is the same as in the 
typical form. 
Horizon and Locality. — Same as last. 
Described from three specimens in the collection of Wachsmuth and 
Springer. 
