DIMEROCRTNIDAE 
2 r 
was fully described in a Devonian genus in my paper on Dolatocrinus,^ with 2, 3 and 4 pin- 
nules to a brachial. Since then it has been further observed by Miss Goldring, Devonian 
Crinoids of New York, 1924, in the genera Clarkcocrinus, p. 180, and Liparocriniis, p. 397, 
with like numbers of pinnules to the brachial. 
This leading species for the Tennessee Silurian was recognized by Troost long l)e- 
fore Roemer’s time, and fully described under the name Balanocrinites in his unpublished 
monograph. 
Horizon and locality. Shaly limestone of Beech River formation, Niagaran ; Decatur 
and adjoining counties, Tennessee. 
Lampterocrinus sculptus new species 
Plate 3, figs. 7, 8 
A variant of the preceding, from the same horizon and locality, with a lower 
and more spreading calyx, more delicate scnlptiire and more numerous ridges. 
Lampterocrinus roemeri new species 
Plate 3, figs, g-14 
Differs from the type species in the much plainer character of the surface 
markings. The ridges are fewer and more prominent, and the rhomboidal areas 
enclosed by them are almost uniformly smooth, and not crossed by other ridges ; 
thus the stellate appearance is largely wanting. The specimens all come from 
a soft shale at a little different level from the former species. 
In addition to the small crown with arms and anal tube, fig. 10, there are 4 calices with 
parts of the radial appendages attached, as in fig. 9, and 20 other good specimens, in all of 
which the characters above mentioned are constant. Here also may be seen the sharply pen- 
tagonal stem characteristic of the genus, with concave sides, as shown in figs. 9 and 10. I have 
called this species L. roemeri, in honor of the founder of the genus. 
Horizon and locality. Soft shale of the Beech River formation, Niagaran; Tuck’s Mill, 
Decatur County, Tennessee. 
genus and species indet. 
Plate 3, figs. 13, 13a 
This fragment, of which there is not enough of the calyx left to indicate its generic 
relations, is figured on account of the very unusual feature of a hexagonal stem, almost un- 
known among crinoids. Aside from its six-sided section, the stem in detail strongly resembles 
that of Lampterocrinus, and the specimen may be only a sport from that genus. 
Horizon and locality, same as last. 
genus and species indet. 
Plate I, figs, ig-22 
Stem fragments of unknown crinoid from St. Paul, Indiana. 
1 Bull. IIS, U. S. Nat. Mus., 1921, pp. 5, 8. 
