30 
PALAEONTOLOGY OF NEW YORK. 
LICHENALIA, Hall. 1852. 
Lichenalia crassa. 
PLATE XI, FIGS. 21, 22. 
/ 
Trema.topora crassa, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 152. 1879. 
“ “ “ Report of State Geologist for 1S82. Expl. pi. 11, figs. 21, 22. 1883. 
Not Fistulipora crassa, Romingek. 
Zoarjum hollow, or explanate. Thickness of specimens observed about 1 
mm. Cell apertures circular, diameter .25 mm., quite regularly separated 
from each other by a space equal to half the diameter of an aperture, form¬ 
ing somewhat irregular intersecting rows. Surface marked by numerous small 
acellular maculae, the centers of which are distant from each other two or 
three mm. Interapertural space smooth. Intercellular space occupied by 
minute septate tubuli, except near the base of the cells, where the space is 
occupied by irregularly arranged vesicles ; from one to three series of tubuli 
between adjacent cells; from eight to ten septa in the space of one mm. 
This species may be distinguished by its closely arranged .cell apertures, 
absence of mesopores, and the numerous acellular maculae. It resembles 
specimens of Fistulipora ponderosa which have been worn or macerated, but that 
species has mesopores and larger cell apertures, and is without acellular maculae. 
Formation and locality. Lower Helderberg group, Schoharie, N. Y. 
Lichenalia maculosa. 
PLATE XIV, FIGS. 1-8. 
Trematopora ponderosa., Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 126. 1874. 
“ maculosa, “ Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 106. 1874 
Callopora maculosa. Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist , p. 156. 1879. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 14, figs. 1-8. 1883. 
Zoarium explanate, generally of irregular growth, frequently much contorted; 
often massive from the superimposition of successive layers of growth. Tliick- 
of bryozoum varying from 1 to 8 mm. Under surface consisting of a strongly 
wrinkled epitheca. Cells tubular, sub-cylindrical, arising from the epitheca 
at right angles to the surface ; walls moderately thick. Septa thin and 
