Pl. [6], Fig. 1.
In the figure the subulate hyaline spaces at the border are, in some instances, wider than usual.
ACTINOCYCLUS MONILIFORMIS RALFS
Surface flat, from centre to about five-sixths of the radius. Central space rounded, with one or more granules. Markings, 8 in 10 µ, round, in radial rows, fasciculate, the oblique transverse rows irregular, very slightly decreasing until near the edge of the flattened zone, and then suddenly decreasing and appearing as decussating lines oblique to the border. Apiculi distinct, interfasciculate within the border. Nodule quite evident, surrounded by a rather wide irregular hyaline space on the margin of the flattened zone in the middle of the fasciculus. Border wide, with striæ about 20 in 10 µ.
Blue clay. Port Penn. Not common.
Pl. [6], Fig. 2.
Equivalent to Actinocyclus ehrenbergii, H. L. S. Type Slide 10.
In a valve from Port Penn, Delaware Bay, two nodules occur nearly opposite each other.
ACTINOCYCLUS ELLIPTICUS VAR. DELAWARENSIS N. VAR.
Valve rhombic-elliptical. Markings somewhat angular, 6 in 10 µ at the centre where they are sub-concentric, thence decreasing in lines radiating more or less toward the border, where they suddenly become punctiform, striæ about 20 in 10 µ. Border equal to one-fifth the radius. A nodule is found on the inner side of the border. Apiculi apparently absent.