BATOCRINIDZ. 44] 
Lobocrinus sequibrachiatus var. asteriscus (Merx and WorrTHeEn). 
Plate X XIX. Figs. Ya, b. 
1860. Actinocrinus asteriscus —Muxex and WortuEn; Proc. Acad. Nat. Sci. Phila., p. 385. 
1866. Actinocrinus asteriscus —Muxx and WoxrtuEn; Geol. Rep. Illinois, Vol. II., p. 207, Plate 15, Figs. 
8a, b, ¢. . 
1873. Batocrinus asteriscus — Mxxrx and Wortuen; Ibid., Vol. V., p. 368. . 
1881. Syn. of Batocrinus equibrachiatus — W. and Sv.; Revision Paleoer., Part II., p. 165. 
Syn. <Actinocrinus equibrachiatus, var. alatus Hatt; Boston Journ. Nat. Hist., p. 263, Photogr. 
Plate 3a, Figs. 21-23; and Whitfield; Amer. Mus. Nat. Hist., 1898, Vol. I., p. 11, Plate 1, 
Fig. 14. 
This variety differs from the typical Loboerinus equibrachiatus in the short- 
ness of the calyx, the flatness of the ventral disk, in being more deeply 
lobed at the arm bases, in the larger size of the costals, and in the con- 
dition of the interbrachial and interambulacral plates, which are in contact 
at all sides. 
Horizon and Locahty.— Upper Burlington limestone, Burlington, Iowa. 
Type in the (Worthen) Illinois State collection, Springfield. a 
Lobocrinus Yandelli (SHumarp). 
Plate XXX. Figs. 7a, b. 
1857. <Actinocrinus Yandelli—Suumarp; Trans. St. Louis Acad. Sci., Vol. I., p. 76, Plate 1, Figs. 
187 3. pas Vandelli — Muzx and Wortgen; Geol. Rep. Illinois, Vol. V., p. 341. | 
1881. Batocrinus Yandelli —W. and Sp.; Revision Paleocr., Part IT., p. 168. 
A large, very knobby and rugose species, Calyx depressed ; the ventral 
disk from one fourth to one third higher than the dorsal cup, the latter ab- 
ruptly spreading from the top of the basals to the bases of the free arms, form- 
ing a low cup or basin, which is followed by a conical disk. The interradial 
spaces are deeply depressed between the rays at the arm bases, especially the 
posterior one which also is wider. The surface of the plates is covered by 
prominent knobs, either transversely or longitudinally arranged. 
Base short, truncated at the bottom; the lower margins projecting out- 
wards and considerably thickened; the upper faces deeply emarginated 
toward the sutures, and the suture lines distinctly grooved, giving to the 
base, as seen from below, a decidedly trilobate aspect. The column facet 
occupies one half the width of the base, and is slightly impressed, its sur- 
face crenulated at the margin. Radials twice as wide as long; their upper 
faces a little concave; the upper sloping faces rather short. The plates 
56 
~~ Nl 
