148 



PALEONTOLOGY OP NEW-YORK. 



interior still remains open. This is shown to some extent in fig. 4 a, where the base is cylindrical, 

 enclosing a fragment of a crinoidal column ; while at the upper extremity it is hollow, showing 

 a tendency to spread into a palmate form. One of the most constant characters of this coral 

 is that the branches at their termination are swollen, having two or three times their diameter 

 below. In transverse sections of the stems giving a vertical section of the coral, it is often 

 impossible to decide whether the cells and interspaces are not both septate. 



Fig. 4 a. A fragment of this species, enclosing in its lower part a crinoidal column, and in the 



upper part being hollow and expanding laterally. 

 Fig. 4 b, c. Sections of the two extremities. 

 Fig. 4 d, e. The upper extremities of two stems of this coral. 

 Fig. 4 /. A lateral view of the termination of a stem which is apparently solid throughout, but 



consisting of enveloping laminae which ceased to extend in some parts while they 



were added to parts of the stem adjoining. 

 Fig. 4 g. An enlarged portion, showing the apertures of the cells and the intercellular spaces 



where the surface is partially worn. 

 Fig. 4 h. An enlarged portion where the minute points surrounding the cell are very conspicuous, 



leaving the cells scarcely visible to the naked eye. 

 Fig. 4 i. A transverse section of a stem enlarged, showing the columnar character and septate 



interspaces with open tubular cells. 



Position and locality. In the shale of this group at Lockport. {State Collection.) 



538. 5. CALLOPORA NUMMIFORMIS (n. sp.). 



PL. XL. Fig. 5 a, 6. 



Depressed hemispherical ; cells opening upon the surface in round-oval apertures, which are 

 often contiguous, and sometimes separated by minute intercellular spaces. 



The specimen described is a small segment of a spheroid, differing little in appearance from 

 the common Ch^tetes ; but a more careful examination shows the apertures to be distinctly 

 roundish oval, and not compressed on the sides. The intercellular spaces are unequal, and the 

 margins of the apertures sometimes in contact, while in others they are separated. 



The species seems more nearly allied to C. elegantula in structure, and an examination of 

 other specimens will probably prove more clearly its generic affinities. 



Fig. 5 a. The upper surface of the specimen, natural size. 

 Fig. 5 J. A portion magnified. 



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



