TRENTON LIMESTONE. 75 



Fig. 3 a. A small fragment of limestonp, with several branches of the coral upon its surface. 



Fig. 3 b. An enlarged portion of one of the branches. 



Fig. 3 c. Transverse section of two brandies of the coral, just above the bifurcation. 



Position and locality. This species is of frequent occurrence in both the lower and central 

 portions of the Trenton limestone. The finest specimens have been obtained from the lower 

 thin shaly layers, the surfaces of wliicli it sometimes nearly covers. The beautiful specimen 

 in the State Collection is from near Herkimer village. It also occurs at Trenton Falls, 

 Middleville, Boonville, Sugar River, Watertown, Plattsburgh, Glen's Falls, &,c. 



114. 6. STICTOPORA ELEGANTULA. 



Pl. XXVI. Figg. 1 a, b, c, d, e,f, g. 



Branches compressed, rigidly bifurcating, and usually more or less curved, celluliferous 

 on both sides of a striated axis ; cellules roundish oval, margins distinctly elevated, closely 

 arranged in alternating lines ; margins of the branches solid, beautifully striated, sharp on 

 the edges. 



This species is readily distinguished from the last, by the usually shorter and broader 

 branches, by the greater number of rows of cells, and their more rounded form, as well as 

 the beautifully striated margins of the branches. The celluliferous crust frequently separates 

 from the central axis, which presents a striated surface, with marks of the bases of the 

 cellules arranged between elevated concentric lines. A similar character will be observed 

 in the species of this genus figured on Plate IV., and may be regarded as characteristic of 

 the genus. 



Fig. 4 tt. A small fragment of the natural size, showing the form of branches and arrangement of cells. 

 Fig. 4 J. A small part of the same enlarged. The form of the cells is more rounded than appears in this 



figure. 

 Fig. 4 c. The entire specimen fig. 4 a enlarged, to show more distinctly the arragement of the cells, 



the striated margin, etc. 

 Fig. i d. A small specimen, bifurcating above, with the celluliferous crust nearly removed, a few of the 



cells only remaining near the base. The longitudinal and concentrically transverse strias 



are clearly shown. 

 Fig. 4 e. A small portion of the same enlarged. 

 Fig. 4 / A more elongated specimen ; the branches narrow, and bifurcating more nearly like the last 



species. The celluliferous crust is removed, leaving the central striated axis. 

 Fig. i g. A small portion of the last enlarged. 



The specimen 4 / is referred to this species, tliough with some hesitation, from the 

 narrow and more extended branches, and fewer rows of cells, the exact form of which 

 cannot be ascertained. 



Position and locality. In the central portions of the Trenton limestone, associated with 

 Orthocerata, Conularia, Orthis testudinaria, Trilobites, &"c. Widdlcvillej Trenton Falls, 

 Jacksonburgh, and other localities in the Mohawk valley. (State Collection) 



10* 



