BROWN, RUGOSE CORALS 
65 
Enterolasma strictum Hall. 
1S74 Streptelasma ( Petraia) stricta Hall, 26th Report New York State Museum, 
p. 114. 
1879 Streptelasma ( Petraia) stricta Hall, 32d Report New York State Museum, 
p. 142. 
1883 Streptelasma strictum Hall, Report of the New York State Geologist for 
1882, pi. I, figs. 1-10. 
1887 Streptelasma strictum Hall, Palaeontology of New York, vol. VI, pi. I, 
figs. 1-10. 
1897 Streptelasma strictum Girty, 14th. Annual Report New York State Geolo¬ 
gist. (1894) p. 300. 
1900 Enterolasma strictum Simpson, Bull. 39, New York State Museum, p. 203. 
This species is abundant in the limestones of the Lower Devonic, particu¬ 
larly in the New Scotland beds. In the Twenty-sixth Annual Report of the 
New York State Museum, Hall describes it thus: 
Cup narrowly turbinate, very gradually and regularly enlarging at an angle 
of about 30 degrees, straight or slightly curved except the small apex which is 
sometimes more abruptly bent. Exterior surface strongly and distinctly ribbed 
longitudinally and marked with concentric, unequal undulations of growth; lon¬ 
gitudinal ribs rounded, from forty-five to fifty-five on specimens at the point where 
the diameter is half an inch; the' increase of ribs or rays taking place usually at 
three points, but sometimes only at two points. Interior of cup broad and deep, 
with thin sharp margin; the lamellae not projecting into the cup until near the 
bottom, but forming low rounded rays, a little stronger than those on the exterior. 
The primary lamellae are smooth on the edge, and strongly granulose on the 
sides below, and sometimes more or less twisted in their direction to the center, 
although generally direct; uniting and coalescing near the middle, forming an 
indistinct plate or vesiculose core, from an eighth to three-sixteenths of an inch 
in diameter; and in vertical section, sometimes showing an indistinctly defined 
vertical wall. 
The secondary lamellae strongly denticulate on the edge below the surface of 
the other lamellae. Fossette obscure or obsolete. 
This species is distinguished by the rigid straightness of its form, the strongly 
ribbed exterior and the deep wide cup with undeveloped rays or ribs; and in these 
characters differs from both those of the Niagara group and also from those in the 
higher formations. 
In the Palaeontology of New York, vol. VI, p. 1, Hall gives a similar 
description of this species with one additional observation. In that descrip¬ 
tion he states that “. alternate lamellae extending only a short distance 
from the walls at the base of the calyx and frequently coalescing with the 
primary lamellae” are a characteristic of this species. The statement con¬ 
cerning the increase of lamellae in this species sometimes taking place at 
only two points is evidently an error, for in this respect the species does not 
differ from other Streptelasma forms. 
