CLINTON GROUP. 
47 
Worn specimens of Stictopora present a near resemblance to this and other species; but 
the laminae separating the cells are never so directly longitudinal, but more or less undulating, 
corresponding to the alternating arrangement of the cellules. By a careful examination, even 
small worn fragments of the two genera, often met with in the same fragment of stone, may 
be easily distinguished. In unworn specimens of this species, the longitudinal lamellae are 
distinctly crossed by a sharp elevated line, dividing the surface into rhomboidal spaces cor¬ 
responding with the cellules. 
Fig. 6 a. A small unworn fragment, of the natural size. 
Fig. 6 b. A similar fragment with the surface somewhat abraded. 
Fig. 6 c, d. The two last, respectively, enlarged, showing the difference between the worn and 
unworn surface. 
Fig 6 e. A portion still farther enlarged, showing the form of the openings of the cellules. 
Position and locality. In the thin layers of limestone alternating with shale at Flamborough 
head, Canada West. Probably also at Lockport and other places in New-York, but not col¬ 
lected at these localities. 
427. 2. PELENOPORA CONSTELLATA (n. sp.). 
Pl. XVIII. Fig. 7 a, b, c, d, e. 
Corallum broadly expanded and elongated, with the two edges parallel; both sides cellulife- 
rous; cellules minute, oval, arranged between thin longitudinal lamellae which separate the rows, 
transversely arranged in nearly a direct or slightly undulating line ; surface of the crust marked 
at regular intervals by circular depressions, in the centre of which is a point more elevated than 
the general surface. 
This species resembles the last in some degree ; and being preserved in the iron ore, it is 
difficult to point out the differences in the more minute details. The most obvious distinction 
exists in the circular impressions, which are regularly arranged in obliquely transverse lines 
over the surface. The space between the bases of the cells is much wider than in the last 
species. 
Fig. 7 a. A portion of a large specimen, showing the entire width of the stipe. The specimen 
shows only the bases of the cellules, the upper portion with the centre having been 
broken away. 
Fig. 7 b. A fragment presenting casts of the cellules, the calcareous matter being removed. 
Fig. 7 c. A surface showing the bases of the cellules at their origin. 
Fig. 7 d. A portion of 7 a enlarged. 
Fig. 7 e. A portion of surface of 7 b enlarged. 
Position and locality. In the iron ore of Wayne county, central part of the group ; also at 
Reynale’s basin, Niagara county. 
