AMERICAN SILURIAN CRINOIDS 
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Calceocrinus bifurcatus new species 117 
Fig. 15. Crown in completely recumbent position, closed over the stem ; main branch of axil- 
arms folded under, and only the large outer ramule visible. 
15a. L. ant. view of same, showing rather slender median arm, bifurcating on 4th brachial, 
and 2 or 3 times beyond to at least 8 finials ; segments of 1 . ant. R separated. 
iSb. Post, view, showing relation of stem to anal plates, with deep indentation; tube projecting. 
Coccocrinus zone of Beech River formation; Decatur County, Tennessee. 
Calceocrinus stigmatus Hall 118 
Fig. 16. L. ant. view of type. After Hall. Am. Mus. Nat. Hist. 
Waldron shale, Niagaran; Waldron, Indiana. 
Calceocrinus typus Ringueberg 118 
Fig. 17. Ringueberg’s type specimen; ant. view showing large median arm in profile, and the axil- 
arm system well developed. 
lyb. Base of same. 
Calceocrinus Hall 118 
Fig. 18. The original figure. After Hall. 
Calceocrinus halli Ringueberg 119 
Fig. 19. Ringueberg’s type; consolidated left basal. 
Rochester shale; Lockpcrt, New York. 
Calceocrinus nitidus Bather 119 
Fig. 20. Complete crown recumbent on stem, 1 . post, view; showing extreme length of median 
arm ; main branch of axil-arms hidden by outer ramules ; only one primibrach in 
lateral arms. 
Wenlockian, Silurian; Dudley, England. 
Calceocrinus pugil Bather 120 
Fig. 21. Crown with short median arm, 1 . post, view; main branches of axil-arms unusually de- 
veloped, larger than the outer ramules ; axillaries strongly nodose. 
Wenlockian, Silurian; Gotland, Sweden. 
Halysiocrinus keyserensis new species 121 
Fig. 22. Ant. view of crown, showing median arm in profile, and axil-arms with main branches 
visible at inner side. 
Helderbergian, Lower Devonian ; Keyser, West Virginia. 
Halysiocrinus marylandensis (Ohern) 122 
F1GS.23, 23a, 23fi. L. post., 1 . ant. and post, views of crown; showing large median arm, segments 
of R separated, inferradials of vanished arms meeting under anal x, main branches 
of axil-arms more or less visible. Coll. Geol. Surv. Maryland. 
Oriskany sandstone. Lower Devonian; Cumberland, Md. 
Halysiocrinus carinatus new species 122 
F1GS.24, 24a. L. ant. and post, views of crown; showing small size of keeled median arm, and 
sharply angular anal tube deeply indented in lower part by pressure of stem. Alpena, 
Michigan. 
25. Calyx of another specimen; 1 . ant. view showing hinge, and separated segments. New 
Buffalo, Iowa. 
. 26. Another specimen probably of this species from near Louisville; 1 . ant. view. Clark 
County, Indiana. 
Hamilton group. Middle Devonian ; Michigan, Iowa and Indiana. 
