SECONDARY AND TERTIARY FORMATIONS OF NORTH AMERICA. 141 



growth of specimen. The pores differed in siee and form, sometimes assuming the character of distinct 

 round foramina. No connection was traced between the obliquely penetrated vesicle and the small chamber 

 at the angle of the cell ; but occasionally a distinct arched solid layer ranged from the opening of the vesi- 

 cle to the distal angle of the cell." 



"Locality. — Eiitaw," (South Carolina, Eocene.) 



We are doubtful of the true generic relations of this species. The pores, placed 

 aside of the mouth, but connected with a chamber at the anterior end of the cellule, 

 would seem to indicate a relationship with the EscharinelUdce, but Lonsdale mentions 

 an occasional second pore, which would also relate it to the EsdiarillinidcB. 



The species differs from E. muralis in its having the sides of the cellules almost 

 parallel, and in the pore in the latter species being very small and placed immediately 

 in advance of the mouth. 



ENNALLIPORA, {N. G.) G. and H. 



Colony testaceous, composed of many superposed layers. Cellules arranged in 

 longitudinal lines or quincunx. Opening moderate in side, placed anteriorly and al- 

 ways provided with one special pore, situated in the succeeding cellules of each longi- 

 tudinal series, in advance of the mouth, but alternately to the right and left hand 

 side. 



The unique arrangement of the pore in this genus will at once distinguish it. We 

 cannot ascertain positively, the manner in which the colony commences its growth, 

 but believe it to resemble Celleporarla and Mullescharinella ; that is, it rises from the 

 surface to which it is attached, in a free plate or branch, over which the succeeding 

 layers are encrusted. 



It may be, however, that the only specimen before us, which is regularlv clavate 

 in form, is encrusting a tube of Serpula or some other slender body. If this is the 

 case, the genus is most nearly related to the decumbent forms. From Miittescharinella, 

 this form is separated by the position of the special pore, which in the above genus is 

 always placed directly in advance of the mouth. 



E. quadrangularis, n. s., fig. 24. — Colony -as described above. Cellules quadran- 

 gular, often irregular, from being crowded, separated by a distinct raised wall ; placed 

 in longitudinal lines, frequently changing their direction. Oral owning round, sub- 

 quadrate or ovoid, situated in the median line, but at variable distances from the an- 

 terior end of the cellule, though always in advance of the centre. Surface convex, 

 sloping upwards from the edge to the mouth which is always at the highest point. 

 Behind the mouth is occasionally a somewhat prominent elevation of a triangular or 

 oval form. The mouth is at times bordered by an almost imperceptible depressed line, 

 producing the appearance of a lip. The edges of the cellule are pierced by a few 

 irregular pores, at times continued as faint radiating grooves on the surface. 



