cuspidate

Basal breadth of all six the same (three times as large as one pore); form, three-sided prismatic, with cuspidate distal end.

Cuspidate, tipped with a sharp and rigid point; as in Fig. 140.

The serrations tend to be more nearly crenulate than cuspidate.

Leaves much smaller, less oblique at the base, finely and regularly crenate, acuminate rather than cuspidate.

Cuspidate: prickly pointed; ending in a sharp point; with an acuminated point ending in a bristle.

Polar spines three-sided prismatic, cuspidate, about as long as the axis of the shell.