150 
PALAEONTOLOGY OF NEW-YORK. 
and the apertures in some specimens are nearly circular. Where well preserved, the calicle or 
margin of the aperture bears three, four or five minute spinules which under the magnifier ap¬ 
pear like dark points. In the greater proportion of specimens, however, these spinules are worn 
off without changing the form or appearance of the aperture. 
Fig. 1 a. A fragment with parts of several branches, showing the tuberculous character very 
distinctly. 
Fig. 1 b. A smaller bifurcating branch of the same species. 
Fig. 1 c. A small branch scarcely showing the tuberculous character. 
Fig. 1 d. The surface magnified, where the apertures are close together, and irregular in their 
arrangement. 
Fig. 1 e. A surface somewhat worn, where the openings are less closely arranged. 
Fig. -1 f. The apertures of several cells, showing minute points or spinules around the aperture. 
Fig. 1 g. A transverse section of a stem enlarged, showing the internal structure. 
Position and locality. In the shale at Lockport, particularly in the thin calcareous layers, 
and occurring where the softer portions have been decomposed and carried away by rains. 
(State Collection.) 
540. 2. TREMATOPORA COALESCENS (n. sp.). — 
Pl. XL A. Fig. 2 a, &. 
Corallum consisting of coalescing branches, somewhat flattened ; surface smooth ; apertures 
of cells round-oval, not contiguous ; intercellular spaces solid ; transverse section indistinctly 
fibrous. 
This species can be distiuguished by its peculiar mode of growth, in specimens where this 
character is preserved ; and in fragments of branches, the more nearly circular form and wider 
separation of the apertures are sufficient to distinguish it. The wider interspaces between cells 
probably gives a more solid structure and appearance to the ends of the stems. In some 
examples, this species appears to increase by successive laminae overspreading portions which 
have ceased to increase by extension of the cells. The calicle is thin and fragile, being often 
worn away entirely, leaving a perforated surface. . 
Fig. 2 a. A fragment showing several branches coalescing. 
Fig. 2 b. A portion of the surface enlarged, showing the apertures where worn and unworn. The 
cells are to some extent unequally distributed over a part of the coral. 
Position and locality. In the soft calcareous shale of the group at Lockport. 
