PLATYCRINLDAE 
53 
Hapalocrinus tuberculatus new species 
Plate 12, fig. 6 
Arms and pinnules similar to the preceding, but calyx rotund, and with 
tubercular surface. 
Hapalocrinus tennesseensis new species 
Plate 12, fig. j 
Crown much displaced, ^Yith sharply uniserial arms and quadrangular 
brachials. 
All the foregoing five species from the Beech River formation, Brownsport group, Nia- 
garan; Decatur County, Tennessee. 
Hapalocrinus devonicus new species 
Plate 12, fig. 8 
Unusually strong stem and cirri, large calyx, and tubercular surface. 
Keyser formation, Helderbergian, Lower Devonian ; Keyser, West \hrginia. 
Brahmacrinus elongatus new species 
Plate 12, figs, g-ig 
The genus to which this species is referred was proposed by Sollas,^ to 
receive a Platycrinid form from the British Lower Carboniferous of true 
Camerate type, having the lower brachials completely incorporated in the cup 
by means of solid interbrachials. Some of the earlier American species of simi- 
lar type, such as P. eriensis,^ might well be placed under it, and it affords a prac-> 
ticable resting place for the present singularly distinct form. 
It may be defined as a Platycrinid with large IBr and IIBr incorporated 
in the cup by iBr in two ranges, huge BB, and relatively smaller RR than in 
Platycrinus. Along with this it is remarkable for having the base divided into 
3 subequal plates, which are sharply excavate into a saucer-shaped depression 
surrounding a rather small stem. This has a minute axial opening, which is a 
Platycrinid characteristic, but there is no sign of elliptic columnals. The pecu- 
liar excavate base is seen in several species of Platycrinus — such as P. liunts- 
villae and others shown in N. A. Crin. Cam., pi. 70, fig. 12; pi. 73, figs, ii, 12. 
In the present species the elongate, rather cylindrical, form of the calyx is dififerent from 
that of the Platycrinidae generally, as is also the great size of the basals. Apparently there 
are two arms to the ray, which probably branch again. There are two good specimens of the 
calyx, and several bases. 
Horizon and locality. Laurel limestone, Niagaran ; St. Paul, Indiana. 
1 Quart. Jour. Geol. Soc. London, 56, 1900, p. 264, pi. 16, figs, i, 2. 
2 N. A. Crin. Cam., 1897, p. 676. See also as to the British form, p. 644. 
