CALYPTOCRINIDAE 
39 
Bull. 1 15, BJ. S. Nat. Mils., 1921, pp. 16-18, pis. 9, 10. Presumably the long- 
rounded columnals in the stem of fig. 5 are nodals similarly overgrown, hut 
without separation to expose the intervening plates. 
Horiaon and locality. Decatur limestone, Niagaran ; Bluffs near Perryville, Tennessee. 
Eucalyptocrinus sp. 
Plate p, figs, y, ya 
A form from the same horizon as the preceding having a perfectly smooth surface and 
turbinate calyx, -which may he a new species, hut the characters are not sufficiently pro- 
nounced for description, and there is a little uncertainty as to the number of IBr. 
Horizon and locality, same as last. 
Eucalyptocrinus crassus Hall 
Plate y, figs, ig, 20 
Eucalyptocrinus crassus Hall, Trans. Albany Inst., 4, 1863, p. 197. — Bassler, Bibliogr. Index, 1915, p. 503. 
The most abundant American species, amply illustrated in various publica- 
tions noted in the Index. The two figures are given here merely for comparison 
with Gatsaerinus in regard to the ventral pyramid. The structure is further 
shown in the Camerata monograph, pi. 8i, figs. 12, 14, 15. 
Horizon and locality. Waldron shale ; the specimens figured are from Hartsville, Indiana, 
hut the species also occurs abundantly at Waldron, and at Newsom, Tennessee, and is reported 
from the Racine dolomite of the Chicago area. 
CALLICRINUS D’Orbigny 
Plate p 
Callicrinitcs D’Orbigny, Prodr. Pal., i, 1849, p. 45. 
Callicrinus Pictet, Traite Pal., 2d ed., 4, 1857, p. 301. — Wachsmuth and Springer, Rev. Pal., 3, 1885, p. 135: 
N. A. Crin. Cam., 1897, p. 353. — Weller, Jour. Geol., 5, 1897, p. 774; Bull. Chicago .Vead. Sci., 4, pt. i, 
1900, p. 1 17, fig. 47. — Bather, Treatise on ZooL, 3, 1900, p. 164, fig. 77. — Zittel-Eastman, Textb. Pal., 
2d ed., 1913, p. 192. — Complete reference and list of species, Bassler, Bibliogr. Index, 1915, p. 158. 
Similar to Euealyptoeriniis in the cup, but basal concavity usually broader; 
tegmen contracting to a decanter shape, and partitions only extending part way 
to ends of arms ; large spinous processes frecjuently given otT from plates of cup 
and tegmen, the upper circlet of the latter often extended in four c|uadrant- 
shaped horizontal projections, sometimes to a considerable length. 
Genotype. Eugeniacrinites costatiis Hisiuger. 
Distributio7i. Silurian ; Gotland, England, America. 
This closely allied form, also typically Gotlandian, has added eight more species to the 
Calyptocrinid type for that area, besides one or two perhaps undescribed, from England. It 
also became well established in the American Silurian, where if judged by the number of 
reported species it would appear to be one of the leading crinoids, limited, with one exception, 
to a single formation or its ecpiivalent, the Racine dolomite of the Chicago area, from which 
nine species have been described. As these species are nearly all based upon internal casts of 
the calyx, in which some of the characters are obscure or not shown at all, there is probably 
