394 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
in the lower portions, flattened and broader above, increasing gradually to 
three times their width at the base. They are composed of a double series 
of short pieces, and are provided along their outer sides with small nodes, 
which in the flattened portions turn into short spines. Near the calyx every 
plate is spine-bearing, but higher up only each second or third. Regular 
interbrachials from two to four, arranged in the usual way, the anal side has 
three in the first, and two or three in the second row ; the anal plate gen- 
erally a little smaller than the radials. The ventral disk is composed of 
slightly nodose plates, its anterior side higher than the posterior, the pos- 
terior oral prominent. Anal tube subcentral and slender. Column rather 
stout, the nodal joints considerably wider and longer than the intervening 
ones, and angular at their edges, 
Horizon and Locality. — Lower Burlington limestone ; Burlington, Iowa. 
Types in the University Museum at Ann Arbor, and in the collection of 
Wachsmuth and Springer. 
Eretmocrinus neglectus Merk and WoRTHEN. 
Plate XX XVI. Fig. 8. 
1868. Batocrinus (Hretmocrinus) neglectus —Munx and WortueEn ; Proc. Acad. Nat. Sci. Phila., p. 355. 
1873. Batocrinus (Eretmocrinus ?) neglectus —M. and W.; Geol. Rep. Illinois, Vol. V., p. 877, Plate 5, 
Figs. 3a, 0. 
1877. Batocrinus neglectus —S. A. Mitten; Amer. Paleoz. Foss., p. 72. 
1881. Hretmocrinus neglectus— W. and Sr.; Revision Paleocr., Part II., p. 178. 
1890. Hretmocrinus neglectus —S. A. Mitten; North Amer. Geol. and Palont., p. 243. 
Of the type of H. clo. Calyx higher than wide; the dorsal cup inversely 
campanulate ; the sides expanding gradually from the base to the distichals, 
thence curving more rapidly to the upper edges of the arm-bearing plates, 
which are slightly grooved but in contact all around; the plates regularly 
convex, especially the radials, first interbrachials, and the anal plate. 
Radials comparatively large, almost as long as wide, First costals quad- 
rangular, a little wider than long; the second frequently heptangular, wider 
than the first but not longer. Distichals one, large, axillary; supporting two 
short palmars and four arms in each ray, unless the anterior ray, which is 
quite often the case, has but two arms, when the large distichal is followed 
by two smaller. Arm facets small, facing outward. Respiratory pores almost 
as large as the ambulacral openings; they occupy the lower end of narrow, 
well defined longitudinal grooves, which extend up into the tegmen for quite 
a distance. Arm structure unknown. Interbrachials generally three, except 
