MELOCRINIDAE 
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Mariacrinus carleyi (Hall) 
Plate 5, figs, g, 10 
Glyptocrinus carleyi Hall, Trans. Alb. Inst., 4, 1863, p. 203; 28tli Rep. New York St. Mus., 1879. P- 132, 
pi. 14, figs. 7-10 . — Mariacrinus carleyi, Waclismuth and Springer, N. A. Crin. Cam., 1897, p. 282, pi. 22, 
figs. 2 a-c . — Bassler, Bibliogr. Index, 1915, PP- 785) 786. 
A very elongate, turbinate species, widely distributed and found at all 
the principal Waldron localities, and also in the Laurel. The specimen from 
the latter here figured lacks the sharp radiating ridges upon the lower plates 
usual in the Waldron specimens, the granulose surface predominating, but in 
the other characters the two agree. 
Waldron shale, Niagaran ; Waldron and Hartsville, Indiana, and Newsom, Tennessee ; 
also Laurel limestone ; St. Paul, Indiana. 
Mariacrinus aureatus S. A. Miller 
Plate 5, figs, ii, iia 
Mariacrinus aureatus Miller, 17th Rep. Indiana Dep. Geol., 1892, p. 644 (adv. sheets, 1891), pi. 6, fig. 36. 
A broadly rotund species, in almost every way the reverse of the preced- 
ing, especially in the highly sculptured ornament which covers the entire cup 
with delicate, stellate figures. 
Horizon and locality. Laurel limestone, Niagaran; St. Paul, Indiana. 
Mariacrinus sp. 
Plate 5, fig. 13 
This specimen, associated with Melocrinus in the beds at Dudley, illustrates the pres- 
ence of the two closely allied genera there as here ; it shows the arms branching in the usual 
way, which is the distinguishing character. 
Horizon and locality. Wenlockian, Silurian; Dudley, England. 
(?) Mariacrinus rotundus new species 
Plate 5, figs. 12, 12a 
This is one of some strange forms from the topmost Silurian, occurring 
in close relation to the Lower Devonian. It is so utterly different in general 
aspect from any other species of this or allied genera that it is placed here with 
much doubt. If seen in a well weathered condition in a miscellaneous collection, 
the specimen would without hesitation be taken for Disygocrimis rotundus of 
the Burlington limestone. Yet according to the structure of the cup as plainly 
delineated, with no anal plates, and radials in contact all around, it must belong 
to the Melocrinidae, having abnormally small basals which cannot be defined 
in the narrow indented cavity, compensated by relatively large radials. The 
highly rounded tegmen is filled with numerous but very definite plates pierced 
by a small subcentral anal opening, while the iBr in the cup are but few. 
Horizon and locality. Decatur limestone. Niagaran ; below Grandview in the bluffs of 
the Tennessee river. Perry County, Tennessee. Associated with Aorocrinus nodosus, infra. 
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