PLATE 35 (bis). 



Fig 2. 518. 2. Catenii'ora agglomerata. ( Pag. 129.) 



2 a. A wcathercil surface of ii mass of this species, sliowing some irregularities in the arrangement of the 

 series of cells. 



2 6. A tiansverse section of an tipper weathered surface, showing the form of the openings, and the arrange- 

 ment in parallel lines with slight interruptions. 



2 c. A vertical section, showing the transverse septa within the tubes. 



2 d, d. A vertical section magnified, showing the concave sei>ta and the cellular interspaces between the 

 tubes. 



2 e. The external surface of several tubes enlarged, showing an obscurely striated surface. 



2 f. A fragment showing the lower or convex surfiice of the septa. 



2 /t. Profile of the same enlarged. 



2 g. The openings of several tubes enlarged, contrasting with similar figures from the varieties of the pre- 

 ceding species. 



