154 



PALEONTOLOGY OF NEW- YORK. 



right hand of the enlarged figure. In another individual, (8 a, b), which can scarcely be 

 separated by any reliable characters from this species, the pores open downward or in 

 the direction of the base of the root, and the stem above is broken off. The cells 

 apparently open in the bottom of continuous striae or grooves, and the same character 

 in some degree often prevails in the branches of the preceding specimens. 

 Fig. 8 a, b. The fragment natural size and enlarged. 



Position and locality. In the shale of the group at Lockport. 



546. 8. TREMATOPORA GRANULIFERA (n. 5^.). 



PL. XL A. Fig. 9 o - e. 

 Compare as in the preceding species. 



Stems bifurcating or variously branched ; openings of cells oval ; margins of calicle granu- 

 late, sometimes confluent, and presenting a single crenulated edge between the cells j internal 

 structure fibrous, and too minute to be fully illustrated. 



This species has the openings of cells much more closely arranged than in the preceding 

 species ; and the interstices, instead of being striated longitudinally, are very distinctly granu- 

 lated, and, where the space is widest, have the appearance of intermediate cellular structure 

 as in Callopora. It usually occurs in small slender bifurcating branches, and the original form 

 and mode of growth has not been ascertained. Stems always solid throughout. 



Fig. 9 a. A bifurcating branch of this species, where the surface is beautifully granulated. 



Fig. 9 b. An enlarged portion of the same specimen. 



Fig. 9 c, d. A small cylindrical stem, and an enlargement, showing the fibrous structure in a 



longitudinal direction. 

 Fig. 9 e. A stem having several branches. 



Position and locality. In the shale of this group at Lockport. 



547. 9. TREMATOPORA ASPERA (n. sp.). 



Pl. XL A. Fig. 10 a, h, c. 



Coral consisting of small, solid, cylindrical, and bifurcating stems ; openings of cells oval, 

 with a crenulate or denticulate margin on the inner side ; intercellular spaces wide, papillose- 

 asperate. 



This species has the cells comparatively distant from each other, the intermediate space 

 covered with very minute spinules or papillose points, and the inner margin of the aperture 

 crenulate. The minute spinules are usually obliterated by abrasion, while the crenulations of 

 the apertures still remain ; vfhere neither of these characters are preserved, the greater distance 

 of the apertures from each other is a reliable character. In several specimens examined the 

 mode of branching is peculiar, and differs from any other species (fig. 10 c). This is a much 

 more slender species than T. striata, to which smooth specimens bear some resemblance. 



