MELOCRINIDAE 
33 
as to the arms, or even with certainty as to the higher brachials. The characters 
are an elongate calyx, cylindrical or slightly contracting upwards; base com- 
posed of 3 small BB, unequal, forming with the RR a broad, flattened, or shal- 
low concave disk ; RR very large, curving below into the base and upward into 
the sides of the cup; IBr and iBr have peculiar variations — the latter usually 
one elongate plate with or without a small one in succession. Four species are 
indicated, based upon rather minor differences visible in the specimens as 
preserved. 
Genotype. Laurelocrinus paulensis new species. 
Distribution. Silurian ; America. 
Laurelocrinus paulensis new species 
Plate J, figs. i-8 
A large, robust species, with broad base and sides rising nearly straight; 
first IBr quadrangular, usually about square, and iBr elongate, 6- or 8-sided, 
followed by a second one much narrower; or exceptionally IBr may be elongate 
and iBr acuminate, not followed by a second; axillary IBr short, followed by 
3 IIBr, the third axillary, indicating probably four arms to the ray. BB limited 
to a shallow cavity, occupied largely by the column-facet with very large lumen. 
Surface smooth. 
Horizon and locality. Laurel limestone, Niagaran; St. Paul, Indiana. 
Laurelocrinus wilsoni new species 
Plate 7, figs, g-ig 
A much smaller form than the preceding, even more so than the drawings 
indicate at first glance, those of the latter being natural size and of this enlarged 
by one half; and it is of similar contour; first IBr hexagonal, iBr 5-sided, fol- 
lowed by one or two others. Arms apparently 4 to the ray. Surface in lower 
part tending to be striate. 
Horizon and locality, same as last. 
Laurelocrinus gibbosus new species 
Plate J, figs. 14-16 
A similar calyx but much more rounded, with extremely large RR and iBr, 
and small quadrangular IBr, all strongly gibbous; base somewhat convex, with 
small column facet and pentagonal lumen. 
Horizon and locality, same as last. 
