CYSTIDEA 
143 
The tegmen is extremely small, in mature specimens about one fourth the greatest diame- 
ter of the cup ; it contains a fourth circlet of five small plates enclosing a central space, from 
which shallow food-grooves extend outward. The apparently central plate shown by the 
drawing in fig. 22 proves to be a foreign substance. 
This form is represented by four good specimens, two large and two small, ranging in 
height from 30 down to 10 mm. The former are typical for the species, while the latter, figs. 21, 
22, represent a more globose species which may take the name Lysocystites globosiis. 
Horizon and locality. Laurel limestone, Niagaran; St. Paul, Indiana. 
Caryocrinus bulbulus Miller and Gurley 
Plate ?y, figs. 2g-2'j 
Caryocrinus bulbulus Miller and Gurley, Bull. 5, Illinois St. Mus., 1894, p. ii, figs. 15-18. — Bassler, Bibliogr. 
Index, 1915, p. 186. 
I have referred a- series of five good specimens to this species, on account of the general 
contour and the strong protuberance on the middle of the second range of plates. In the 
description the surface is said to be otherwise smooth, but here it is marked by a variety of 
sculpture. They all have a juvenile aspect, and may be merely the young of C. milliganae. 
Horizon and locality. Beech River formation, Niagaran; Decatur County, Tennessee. 
Caryocrinus persculptus new species 
Plate ss, fig. 28 
A strongly marked form of turbinate contour, in which the entire surface is covered with 
such an intense sculpture that the folds and pores are transformed into solid, rugose ridges, 
strongly elevated, not only on the lines of folds but between them,. It is from a different 
horizon from all the described species, none of which agree with it in the characters stated. 
The one that nearest resembles it in surface markings is Caryocrinus ellipticus Miller and 
Gurley, from the Osgood. 
Horizon and locality. Waldron shale, Niagaran ; Newsom, Tennessee. 
Caryocrinus milliganae Miller and Gurley 
Plate 33, figs. 29-36 
Caryocrinus milliganae M. & G., Bull 9, Illinois St. Mus., 1896, p. 63, pi. 5, figs. 3, 4. — Wood, Bull. 64, 
U. S. Nat. Mus., 1909, p. 10. — Bassler, Bibliogr. Index, 1915, p. 186, for genus and species. 
This is the most abundant cystid in the Tennessee area, and is subject to considerable 
variation in general form, from pear-shaped to ovoid, and from rotund to elongate. It attains 
a large size. The stereom folds radiating from the middle of the plates, and the lines of pores 
with their raised margins, characteristic of the genus, are abundantly shown in this material. 
Troost proposed three species for different varieties, all of which are listed under the 
present species in Miss Wood’s edition of his monograph, .'\mong the earlier collectors this 
form was always referred to C. ornatus Say. I am figuring five rather well marked types, 
which will give a good idea of the range of variation shown by the collection, supplemented by 
an instructive figure of Say’s well known genotype from Lockport. 
Horizon and locality. Beech River formation, Niagaran ; Decatur County, Tennessee. 
Caryocrinus ornatus Say 
Plate 33, fig. 37 
Jour. Acad. Nat. Sci. Phil., 4, 1825, p. 290. — Bassler, Bibliogr. Index, 1915, p. 187. 
For comparison with the forms from the Tennessee area, and to show the structure of the 
biserial arms. 
Horizon and locality. Rochester shale, Niagaran; Lockport, New York. 
