CORALS AND BRYOZOA. 
35 
PALESCHARA, Hall. 1874. 
Paleschara incrustans. 
PLATE XVI, FIGS. 15-21. 
Paleschara incrustans, Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 106. 1874. 
“ “ “ Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 160. 1S79. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 16, figs. 15-21. 1883. 
Zoarium foliate, very thin, in crusting other bodies; thickness from .10 to 1 
mm. Cells polygonal, in contact; walls thick, sometimes elevated at the 
angles of the apertures into obtuse processes, which are not sufficiently long 
to be characterized as spines. 
This species is very common upon the valves of Spirifera perlamellosa . 
Formation and locality. In the shaly limestone of the Lower Helderberg 
group, near Clarksville, N. Y. 
Paleschara radiata. 
PLATE XVI, FIGS. 13, 14. 
Paleschara (?) radiata, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 160. 1879. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 16, figs. 13, 14. 1883. 
Zoarium consisting of a thin expansion incrusting other bodies. Cells polyg¬ 
onal, contiguous, oblique. Length of apertures about .40 mm., width slightly 
less; irregularly arranged, radiating from maculae of slightly larger cells. 
Formation and locality. Lower Helderberg group, near Clarksville, N. Y. 
Paleschara ? dissimilis. 
PLATE XV, FIGS. 10-13. 
Lichenalia dissimilis, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 158. 18S0. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 15, figs. 10-13. 1883. 
Zoarium consisting of large, explanate fronds, irregularly undulating; thick¬ 
ness from .50 to 3 mm. Cell apertures polygonal, contiguous, length from 
.80 to 1 mm., width slightly less; variable in form, sometimes arched and 
