CORALS AND BRYOZOA. 35 



PALESCHARA, Hall. 1874. 

 Paleschaba inckustans. 



PLATE XVI, FIGS. 15-21. 



Palesckara incnistans. Hall. Twenty-.sixth Rept. N. Y. State Mus. Nat. Hist., p. 106. 1874. 

 " " " Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 160. 1879. 



" " " Report of State Geologist for 18S2. Expl. pi. 16, figs. 15-21. 1883. 



Zoakium foliate, very thin, incrusting 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. 



Paleschaba radiata. 



plate XVI, FIGS. 18, U. 



PaUschara (?) radiata. Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 160. 1879. 



" " •• Report of State Geologist for 1882. Expl. pi. 16, figs. l.S, 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. 



Paleschaba ? dissimilis. 



PLATE XV, FIGS. 10-U. 



Llchetialia dit^milU, Hall. Thirty-seconil Rept. N. Y. State Mus. Nat. Hist., p. 158. 1880. 



Report of State Geologist for 1882. Expl. pi. 15, figs. 10-13. 1883. 



Zoabium 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 



