228 
SMITHSONIAN INSTITUTION 
PLATE 28 
(Figures natural size unless otherwise stated) 
Cremacrinus ulrichi new species 105 
Fig. I. Complete crown of maximum specimen, with nearly entire stem, in a partially erect 
position ; anterior view, the arms somewhat displaced ; r. ant. arm smaller than ant., 
the two rami of the latter occupying at least four fifths of the space on the exposed 
side. 
2. Another crown, ant. view, showing the dwarfed r. ant. ramus rather better than the 
preceding. 
Beech River formation ; Decatur County, Tennessee. 
Cremacrinus tubuliferus new species 106 
Fig. 3. Complete crown seen from the median arm transversely flattened, but free on both sides; 
showing quadrangular inferradial. 
3a. L. post, view of same, enlarged, showing median arm with 2 brachials beyond IBr ; the 
large curved anal tube free from the arms lying to the left of stem ; 1. post, arm divid- 
ing into 2 symmetrical rami each with 8 bifurcations, and 9 long ramifies. X 2. 
3b. Anterior view of same, showing ant. arm with about 6 visible branches to each ramus ; 
r. ant. arm dwarfed to about one fourth the size of ant., with 3 short remnants of 
ramifies on one side. X 2. 
4. Median view of another complete crown free on both sides. 
4a. L. post, view of same, showing arm with 8 and 9 long ramifies to each ramus, and other 
features similar to 3a. X 2. 
4b. Ant. view of same, showing by the diminutive branches lying against the tube all that is 
left of the dwarfed r. ant. arm — less than one fourth the size of ant. X 2. 
5. Complete crown in recumbent position upon long stem, with tube bent like a bow; from 
ant. side, showing the two unequal arms. X .I/2. 
5 a. Anterior view of calyx, showing segments of 1 . ant. R. X 3/2. 
6. Another crown similar to last, with peculiar hypertrophy of ramus of ant. arm. X 2. 
Beech River formation; Decatur County, Tennessee. 
Cremacrinus decatur new species 107 
Fig. 7. Anterior view of the only specimen, a nearly complete crown, showing the very stout 
median arm, and diminished r. ant. arm. X 3/2. 
Decatur limestone; near Rise Mill, Perry County, Tennessee. 
Cremacrinus simplex new' species 107 
Fig. 8. The only specimen ; 1 . post, view of crown, showing the ray dividing symmetrically, with 
further bifurcations giving 6 branches in all, more or less dichotomous; stem at right 
of anal tube. X 2. 
8a. Anterior view, showing two arms, ant. somewhat dwarfed. X 2. 
Beech River formation; Decatur County, Tennessee. 
Cremacrinus articulosus (Billings) 108 
Fig. 9. L. post, view of crowm, showing the long median arm in profile, bifurcating near the end; 
the two rami of 1. post, arm with their 7 or 8 zig-zag articulations, bearing long 
ramules. 
ro. A complete crown in closed position on stem ; ant. view showing long median arm in 
profile, the 2 rami of ant. arm fully developed about as long as median arm, and 
r. ant. arm reduced to less than half its size. 
11. A smaller crown, for comparison of arms and position of stem. 
12. Basal view of another calyx, showing hinge, and the 2 connected segments of 1 . ant. R. 
13. Large specimen from Woodford County, Kentucky, anterior view. 
Trenton group, Ordovician; all except 13 from Kirkfield, Ontario. 
