NIAGARA GROUP. 
151 
541. 3. TREMATOPORA TUBULOSA (n. sp.). 
Pi. XL A. Fig. 3 a, b, c. 
Corallum consisting of cylindrical or flattened stems, solid or having the interior filled with 
mineral matter; cells closely arranged, opening upon the surface by minute oval apertures, 
and margined by elevated borders which are more projecting on the lower side; transverse 
section showing a fibrous structure. 
This coral differs from the preceding, in having more closely arranged apertures opening 
obliquely upward, with the border on the lower side more projecting. The coral is a hollow 
cylinder, the interior being filled with stony matter ; but this condition occurs in many species 
of this genus. 
Fig. 3 a. A fragment of a stem of the natural size. 
Fig. 3 b. A section of the end of the stem. 
Fig. 3 c. A portion of the surface enlarged, showing the form and arrangement of cells. 
Position and locality. Green shale of the Clinton group, Wayne county. 
This species is arranged with its congeners in this place, in preference to giving it by itself 
with the corals of the Clinton group. It is the only one of the genus known below the Niagara 
shale. 
542. 4. TREMATOPORA PUNCTATA («. sp.). - 
Pl. XL A. Fig. 4 a, b, c. 
Coral incrusting, composed of cylindrical tubular cells which open upon the surface in cir¬ 
cular apertures; apertures closely arranged ; internal structure showing the cylindrical tubes 
and septate interspaces. 
This coral is only known as incrusting crinoidal stems, several specimens having been found 
in this condition. It differs from either of the preceding species in the circular apertures, which 
are usually closely arranged, giving the surface a punctate character. In worn specimens the little 
marginal elevations around the aperture are often obliterated, and the stem is smooth with 
the small round pores penetrating its surface. The apertures are sometimes slightly separated 
from each other, and the arrangement, though apparently uniform, is nevertheless, under a 
magnifier, shown to be variable. 
Fig. 4 a. A coral of this species enveloping a fragment of a crinoidal stem. 
Fig. 4 b. A portion of the surface enlarged, showing the form and arrangement of the apertures* 
which are sometimes close together and in other parts separated. 
Fig. 4 c. A section of the stem enlarged, showing the structure of the coral. 
Position and locality. In the soft shale of the Niagara group at Lockport. 
