CORALS AND BRYOZOA. 
67 
Formation and locality. In the shaly limestone of the Lower Helderberg 
group, Schoharie, N. Y. 
MONOTRYPA, Nicholson. 1879. 
MONOTRYPA ? SPINOSULA, 11. Sp. 
PLATE XVI, FIG. 25. 
/Species undetermined. Report of State Geologist for J882. Expl. pi. 16, fig. 25. 1883. 
Zoarium explanate. Cells polygonal; septa infrequent; diameter of cell aper¬ 
tures .25 mm. Surface marked by maculae composed of cells of nearly twice 
the diameter of those on other portions of the zoarium. Centers of maculae 
distant from each other 5 mm. 
Formation and locality. Tentaculite limestone, Lower Helderberg group, 
Schoharie, N. Y. 
Paleschara concentrica, n. sp. 
PLATE XVI, FIG. 24. 
Species undetei’mined. Report of State Geologist for 1S82. Expl. pi. 16, fig. 24. 1883. 
Zoarium foliate; cells polygonal, in contact; walls thin ; diameter of apertures 
.40 mm.; disposed in a radiatingly concentric order. 
This species may be distinguished from P. incrustans by the more regular 
arrangement of the cell apertures. 
Formation and locality. Lower Helderberg group, Clarksville, N. Y. 
