HEXACRINIDZ. 187 | 
Horizon and Locality.— Upper part of St. Louis limestone; Grayson, | 
Edmondson, and Pulaski Cos., Ky. i 
Remarks. — The type specimen, which is figured on Plate LXXVIIL., | 
Fig. 5, is in the Lyon collection; that of Figs. 4a, 6 on the same plate is in | 
> the collection of Wachsmuth and Springer, | 
Dichocrinus elegans Cass. and Lyon, in our opinion, belongs to this species. 
The type specimen, which is badly crushed, is possibly a little more lobed at 
the ventral disk, but that alone is not sufficient to make it a different species. | 
The differences to which the authors refer are not borne out by the facts. 
Talarocrinus symmetricus, like 7. elegans, has four arms to the ray, and not | 
two, as stated in the description. | 
Talarocrinus ovatus WorTHEN. 
Plate LXXVII. Figs. 2a, 6. | 
1882. Wortuen; Bulletin I., Iinois State Mus. Nat. Hist., p. 36. 
1883. WortHeEn; Geol. Rep. Illinois, Vol. VII., p. 314, Plate 29, Fig. 11. 
1885. W.and Sp.; Revision Paleocr., Part IIT., p. 120. 
a Sa, Se i ee ae eee 
Calyx more elongate than in the preceding species, ovate in its general 
outline, the dorsal cup proportionately higher and less spreading, the radials i 
more evenly convex, and not tumid at the upper end. Basal cup compara- 
tively large and deep, truncate at the bottom, and slightly excavated for the 
: reception of the column; the sides but little expanding. Radials somewhat 
longer than wide, a little wider above than below, slightly inflected at the 
upper end; their lower faces straight, except at the anterior plate where 
they are distinctly angular; the upper deeply excavated to about one half 
their width, and the facet directed obliquely outward. Anal plate longer 
than the radials and heptagonal. The costals rest obliquely upon the radials, 
and are larger than usual in this genus, forming a small triangle with con- 
cave sides. Of the distichals only one row of plates is visible, which are 
short and excavated at the upper face. This may have been followed 
by an axillary distichal, or have directly supported the arms. The number 
and structure of the arms unknown. Ventral disk highly elevated, the 
interambulacral spaces depressed, especially near the arm bases. Anal area 
projecting, giving to the ventral disk, as seen from the summit, a distinctly 
hexagonal outline. Interradial plates three and one; the middle plate of 
the first range, and the upper, very large, the two at the sides small, about 
half as long as the middle one and considerably narrower, Anal area elon- 
