346 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Eucalyptocrinus inconspectus Riveveserc. 
Plate LXX XIII. Figs. 1 and 2. 
1884. RixeurBerc ; Proceed. Acad. Nat. Sci. Phila., p. 148, Plate 3, Fig. 5. 
Of rather large size. Dorsal cup deep, occupying almost one half of the 
length of the crown; semi-ovoid, the sides decidedly convex, rising gradu- 
aly to the middle of the second costals, thence almost vertically to the top, 
so that the plates at the upper end are parallel to those of the opposite side. 
Plates flat— the general curvature excepted — and without ornamentation 
or other markings,* the suture lines indistinct. 
Basal concavity narrow and filled completely by the upper part of the 
column. Radials about as long as their width near the top, rapidly tapering 
downward, the extreme lower end gently curving inward and taking part in 
the columnar concavity; the slopmg upper faces very short. First costals 
as wide as long, a little narrower at the upper end, the sides slightly convex. 
Second costals as long as the first, widest at two thirds their height, some- 
times the upper angle slightly touched by the interdistichals. First distichals 
a third smaller than the upper costal, the second very small, and the suc- 
ceeding palmars still smaller and irregularly pentangular. First interbrachial 
extremely large, decagonal, about a third longer than wide, attenuate at 
both ends; the two of the second: row shorter, and together narrower than 
the first, their upper and lower ends forming re-entering angles. The 
interdistichal approaching the two upper interbrachials in form, but con- 
siderably smaller; its upper end squarely truncated, and rising to the third 
arm plate. Partition walls narrower than the arms, and of uniform width 
throughout; their outer edges flat at the proximal, and convex at the distal 
end. Arms gradually tapering, rounded exteriorly ; the three lower joints 
single, and a little longer than the upper, which are extremely short. Struc- 
ture of disk and summit unknown. 
Horizon and Locality. — In the white limestone at the upper part of the 
Niagara group ; Rochester, N. Y. 
Remarks. — Nearest to F. crassus, but the sides of the dorsal cup dis- 
tinctly rounded, the base not truncated, and the basal concavity very much 
smaller. 
* Ringueberg described the surface as “ finely rugose ; ruge giving evidence of irregular radiations 
from the larger plates.” We have carefully examined his type, but cannot discover any ornamentation; the 
roughness upon the surface is evidently caused by weathering. 
