io6 
SMITHSONIAN INSTITUTION 
its two slender rami having- fewer branches. I.ateral IBr 2. Anal tube not ex- 
posed. Stem in largest specimen 14.5 cm. long, diminishing distalwards; col- 
umnals about 2 mm. long except in the proximal part, where they become much 
shorter and cuneate in the curve. 
This species is founded upon two crowns, one of which has the stem nearly complete. 
Both are exposed from the anterior side only, so that we are without information as to the 
character of the anal series and tube. The relative length and slenderness of the brachials 
impart a certain lightness and delicacy of construction which is in contrast to that of the 
accompanying species. In superficial appearance of this and the following species there is 
a considerable resemblance to the Calceocrinus gotlandicus of Angelin, but the fine illustrations 
of that species in Dr. Bather’s work give no indication of any of the generic characters which 
are here so pronounced ; its mode of arm-branching, however, represents an intermediate stage 
between the two equal rami of Creinacrimis and the complete axil-arm system of the typical 
Calceocrinus and Halysiocrinits. 
The specific name is in honor of the eminent geologist and paleontologist, Mr. E. O. 
Ulrich, of the United States Geological Survey and the National Museum. 
Horizon and locality. Eucalyptocrinus zone of the Beech River formation, Brownsport 
group, Niagaran; Tuck’s Mill, Decatur County, Tennessee. 
Cremacrinus tubuliferus new species 
Plate 28, figs, g, ga, b, 4, 4a, b, 5, ga, 6 
Crown uniformly small, ranging in height from 20 to 23 mm. in five speci- 
mens. Cup elongate, quadrangular, but little constricted; average height 6 mm. 
to width at hinge of 4.5 mm. Median ( 1 . ant.) arm short and slender, tapering 
to a narrow point and not reaching the height of the adjacent lateral arms; with 
few very long brachials, sometimes only 2 or 3 in all beyond the short primi- 
brach; inferradial truncate, broadly connecting with triangular superradial. 
Main rami of adjacent (ant. and 1 . post.) lateral arms have from 6 to 9 axillary 
brachials each, nodose and prominent, giving off alternate ramules with very 
long ossicles beyond the first, reaching the full height of the arms, from succes- 
sive series of two or three brachials — Alphabrachs, Betabrachs, etc. — ending 
in an ecjual bifurcation; thus there are 12 to 18 finials to each of these arms; 
r. ant. arm similarly divided into two rami, but greatly dwarfed in size, much 
narrower at the primibrach, shorter than the other arms and having fewer and 
smaller ramules. In one specimen where the anterior arm is 18 mm. long, the 
r. ant. arm bifurcates finally at about 9 mm. ; and in two specimens having both 
arms perfectly exposed the area covered by the anterior arm is about four times 
that of the r. ant. Lateral IBr. 2. Anal series extended into a massive tube, 
exceeding in diameter any of the arms, and apparently ecjualing them in length, 
sometimes curving outward like a bow. Stem prominent at right of the tube, 
stout, with columnals beyond the proximal curve 1.5 to 2 mm. long; in one speci- 
