78 PALjEONTOLOGY of NEW-YORK. 



This coral presents the essential characters given by de Blainville for the Intricaria, 

 a genus established by Defrance for a fossil coral. Our species is composed of fine filiform 

 branches, which diverge and anastomose, sometimes with a considerable degree of re- 

 gularity, leaving oblong hexagonal spaces between. At other times they are irregular in 

 their mode of branching and uniting. The worn branches are smooth, showing that the 

 cells do not penetrate beyond the outer crust of the coral. The cells are in a single row, 

 except just below flie bifurcation of the branches, where there is a double row. 



This beautiful little coral is exceedingly obscure, and has Ijeen observed only on the 

 weathered surfaces of the rock, thougli it is believed to have a somewhat extended geo- 

 graphical range. It is found associated with species of Stictopora, and small ramose forms 

 of the CluBtetes lycoperdon. 



Fig. 8 a. A small fragment of the rock covered by this coral, and fragments of one or two other species 



( natural size ). 

 Fig. 8 b. A portion magnified, showing the apertures of the cells, and the mode of branching and 



anastomosing. A small fragment of another coral lies across the specimen. 

 Fig. 8 c. A small portion of a branch still more enlarged, showing the apertures of the cells. 



Position and locality. In the lower concretionary portion of the Trenton limestone at 

 Watertown, Jefferson county ; also in the regularly stratified portions of the same rock 

 near Ticonderoga, on the shore of Lake Champlain. (State Collection.) 



119. 3. RETEPORA? FOLIAGE A. 



Pl. XXVr. Figs. 9 a, b. 



The specimen is a small fragment, apparently of the non-poriferous surface of Retepora. 

 It is a thin expanded coral, presenting a tessellated surface as represented in the figure ; 

 the small sharp elevated ridges not crossing each other directly, but appearing as if knotted 

 at their Junction. 



This single specimen is all that has been seen, and farther observation is required to 

 decide satisfactorily the generic relations of the coral. It is presented here, in the hope of 

 calling the attention of observers to the existence of such a form in the Trenton limestone ; 

 and, also, that if it prove to be a Retepora, it is the lowest position, geologically, in which 

 the genus is known. 



Fig. 9 a. The specimen (natural size), upon the surface of limestone, with other corals. 

 Fig. 9 h. The surface of the same enlarged. 



Position and locality. In the shelly part of the Trenton limestone, nearly half way from 

 the base to the top. Lowville, Lewis county, 



