RETEOCRINID. 185 
Xenocrinus Baeri (Merx). 
Plate IX. Figs. du-d. 
1872. Glyptocrinus Baeri —MeEK; Amer. Journ. Sci., Vol. IIT. (3d ser.), p. 260. 
1873. Glyptocrinus Baeri — Mee; Geol. Rep. Ohio, Paleont., Vol. I., p. 37, Plate 2, Fig. 1. 
1880. Glyptocrinus baeri —S. A. Mitten; Journ. Cincin. Soc. Nat. Hist., Vol. IIL, Plate 7, Fig. 4. 
1881. Reteocrinus Bueri— W. and Sp.; Revision Palwocr., Part II., p. 193. 
1883. Reteocrinus Baeri — W. and Spv.; Amer. Journ. Sci., Vol. XXV., p. 266. 
1883. Glyptocrinus baeri—S. A. Mitier; Journ. Cincin. Soc. Nat. Hist., Vol. IV., p. 226. 
1885. Xenocrinus Baeri— W. and Sp.; Revision Paleocr., Part III., p. 96. 
1889. Xenocrinus baeri—S. A. MittER; North Amer. Geology and Palsont., p. 288. 
Dorsal cup higher than wide; subovoid; depressed at the interradial 
spaces, but not so much so as in X. penieillus ; cross-section pentangular. 
Basals small, only their upper angles visible in a side view. Radials and 
costals elongate, formed into conspicuous rounded ridges, which occupy 
almost the entire width of the plates. Distichals free from the fifth or sixth 
plate ; the two proximal ones as large as the costals, the third somewhat 
shorter, and the upper ones but little longer than the free plates. Arms 
ten, simple, long, rather stout; composed of very short, transverse joints, 
with slightly convex outer faces. The lower arm joints rectangular, followed 
by cuneate pieces, which slightly interlock. Interradial areas deepest in the 
middle ; composed of numerous very small, convex pieces, with a somewhat 
corrugated surface. Anal side divided by a longitudinal row of anal plates, 
shaped like the radials and costals. Ventral disk low-hemispherical ; plates 
very minute; the position of the anus unknown. Column quadrangular, 
with obtuse angles; the joints extended outward into long knife-like edges. 
Horizon and Locality. — Hudson River group; Warren Co., O., and Rich- 
mond, Ind. 
The specimens figured are from the Collection of Wachsmuth and 
Springer, and that of I. H. Harris, Esq., of Waynesville, O. 
TANAOCRINUS (nov. gen.), W. and Sp. 
(ravaos, slender; Kptvov, a lily). 
Resembling Reteocrinus, but without infrabasals, and the radials in lateral 
contact except at anal side. Symmetry decidedly bilateral. Arms long and 
slender. 
Basals small; the posterior one truncated at the upper end, and followed 
by a large anal plate. Costals two, narrower than the radials, and folded 
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