HETEROCRINIDAE 
II7 
The specific name is given in recognition of the extensive and valuable researches of 
Dr. August F. Foerste in the Silurian and Devonian formations of Tennessee. 
Horison and locality. Eticalyptocrinns zone of Beech River formation, Brownsport 
group, Niagaran; Tuck’s Mill, Decatur County, Tennessee. 
Calceocrinus bassleri new species 
Plate 2Q, figs. 12a, b, ig, 14; pi. 28, fig. 21 
Crown of large size, from 50 to 56 mm. in height. Cup seen from left 
anterior side obtusely subquadrangular, relatively short and wide; height to 
width at hinge line in maximum specimen i to 1.5 ; but little constricted. Median 
(1. ant.) arm simple, stout, much thicker and longer than the axil-arms; brachials 
about 3 mm. high; segments of 1 . ant. R triangular, widely separated by the 
large RR abutting between them, exceptionally touching by their apices. Lateral 
IBr 2. Main-axils of lateral arms 5 to 8, brachials in series of 2 to 4; inner 
Betabrachs (abanal) and following series more or less exposed alongside the 
outer ramules, their brachials moniliform. Anal tube projecting beyond arms, 
not so stout as in preceding species; anal x large, strongly rounded, but little 
indented by column ; subanal piece rather short, usually widening upward. Stem 
long, stout, but little curved next to calyx; columnals very short, at 25 mm. from 
base averaging .7 mm. long and 3 mm. diameter. 
This species is founded upon six crowns, four of which are figured, one with almost the 
complete stem attached. It differs from the preceding species in having the segments of 1 . ant. 
R disconnected as usual in the genus, in the exposure of the main branch of the axil-arms, 
and in the short columnals of the stem. It is to be compared with C. pngil and C. tucanns of 
Gotland, with which it is evidently closely related, the chief differences being its larger size 
and greater number of axil-arms. In the relative exposure of the main axil-arm it is closer 
to those species than the published figures would indicate, as is shown by a specimen from 
Gotland in my collection herein figured, plate 29, figure 21. 
This fine species is named in honor of Dr. R. S. Bassler, of the United States National 
Museum, whose field-work during several seasons has greatly enlarged our knowledge of the 
geological structure of Tennessee. 
Horizon and locality. Encalyptocrinns zone of Beech River formation, Brownsport 
group, Niagaran; Tuck’s Mill, Decatur County, Tennessee. 
Calceocrinus bifurcatus new species 
Plate 2Q, figs, ig, iga, b 
Crown of medium size, abont 45 mm. high, of slender form as compared 
with preceding species. Cup widening basalward, height 7 mm., width Q mm., 
and but little constricted. Median ( 1 . ant.) arm slender and very deep, bifur- 
cating on the third brachial above the primibrach, and again on the second, the 
inner branch dividing again, thus giving 6 or 8 finials; all the brachials are long 
and narrow, the lower three being 4.5 mm. long by 1.5 wide; segments of 1. ant. 
R widely separated by large RR, the superradial triangular and the inferradial 
