BLACK-BIVER LIMESTONE. 51 



85. 4. STICTOPORA RAMOSA (n. 5p.). " 



Pl. XII. Figs. 6, 7 & 7 o. 



A branching, erect, somewhat stony coral, covered on both sides by a celluliferous crust ; 

 branches flattened ; cells oval, in quincunx order, arranged in regular oblique lines, 

 alternating with each other in the direction of the axis, opening obliquely upward and 

 outward ; mouths of the cells in perfect specimens elevated, more perfectly rounded at the 

 upper side ; intercellular spaces striated 1 



This fossil occurs in various conditions, generally more or less worn, and broken into 

 fragments : when perfect, the mouths of the cells are clearly elevated ; when a little worn, 

 they are even with the crust ; when more worn, the whole frond has a retepore-like aspect, 

 and the intercellular spaces are proportionally much less. 



Fig. 6. A small fragment of limestoBe, the surface covered with pieces of the coral. 



Fig. 7. A small portion showing the base of the cells when separated from the internal axis. 



Fig. 7 a. The same magnified. 



Position and locality. Great numbers of fragments of this species occur in some thin shaly 

 layers at the termination of the Birdseye limestone ; during the deposition of which, the 

 species seems to have flourished in much greater numbers than at any other period.* 



(State Collection.) 



CRINOIDAL COLUMNS. 



Pi.. XII. Fig. 9. 

 Fragments of columns of this kind, diflfering in no respect from the species of the Trenton 

 limestone, are found in the Black-river limestone at Watertown ( See plate and description 

 of the same ) . 



* The accompanying illustration may render the character of this fossil more clear. 



I 



I  



Fig. 1 is a fragment of stone, showing the fossil of its natural size. 



Fig. 1 a. A magnified portion, showing the ranges of cells and their regular alternation. 



Fig. 2. A small fragment of the coral, showing the bases of some of the cells. 



Fig. 2 *. The same enlarged, a, the external celluliferous crust, b, the axis denuded of the crust, showing marks 



of the cells, c, bases of the cells, the margin well defined, distinctly oval ; the longest diameter in the 



direction of the axis. 



7* 



