JUNE, 1906. HyPpsocRINUS — SPRINGER AND SLOCOM. 269 
mens of this species, from the same locality as Oehlert’s, which show 
them very plainly, not as actual sutures, but rather as lines of 
anchylosis. So it is evidently a constant character. The trans- 
verse bisection of the radials by the sutures represented by these 
lines would produce compound radials in the same rays in which 
they occur in Haplocrinus, Heterocrinus, and similar forms. This 
species, therefore, represents a form which in its younger stage would 
have fallen into the same group of irregular crinoids as our genus, 
but in which, by growth during hfe, the compound radials were 
eliminated, and the Crinoid modified into a regular form. Phimo- 
crinus has straight radial facets, filling the entire distal face of the 
radials, and the arms articulate on a linear hinge line. 
HyYPSOCRINUS FIELDI sp. nov. Pl. LXXXI, Figs. 1-6. 
Calyx elongate, cylindrical, slightly expanding to the arm bases. 
Base truncate; basal facet broad, slightly concave, entirely filled by 
the column; axial canal stellate or pentagonal, interradial in posi- 
tion. Basals very elongate, forming two-fifths to half the height 
of the cup. Radials, three large and two small, all arm-bearing; 
the two smaller ones short, wider than high, separated from the 
“ pasals by three much more elongate infer-radials, one of which is 
directly beneath the right posterior radial, and represents the 
radianal; the other two are for the most part directly under the 
right anterior radial, whose lower margin meets them by an obtuse 
angle, but in part obliquely under the left lower corner of the 
anterior radial, meeting it by a curved suture; the other three 
radials are large and elongate plates. Arm facets very shallow, 
curved, not entirely filling the distal face of the radials, but leaving 
short, sloping shoulders between, which are rounded off exteriorly, 
but probably formed a support for oral plates in the tegmen. Arms 
simple, uniserial, tapering rapidly, and doubtless very short. No 
trace of a dorsal canal in radials or brachials. Anal structures and 
tegmen unknown. Surface smooth; calyx plates slightly rounded, 
and sutures distinct. Stem unknown; but it was large at the proxi- 
mal end, as the radiate markings of its articulation are visible to the 
edge of the basal facet. 
Horizon and Locality: Devonian; Hamilton group. Found near 
East Bethany, New York. 
The specific name is in memory of Marshall Field, the founder of 
the Field Columbian Museum, where the type specimen is deposited. 
Remarks. In the foregoing description we have found it neces- 
sary to guard against the insertion of some details, which are appar- 
