RHAPHONEIS AMPHICEROS VAR. RHOMBICA GRUN.
Valve as in type form but shorter, with larger and more remote granules.
Blue clay.
Pl. [10], Figs. 39 and 40.
RHAPHONEIS BELGICA VAR. INTERMEDIA GRUN.
Valve lanceolate, rostrate; granules in longitudinal and nearly transverse, not radiating, lines.
Absecon, N. J.
Pl. [10], Fig. 41.
Dimerogramma Ralfs (1861)
(dis, two, meros, a part, gramma, a letter)