NIAGARA GROTTP. 139 



Fig. 2 a. A view of this species from the base : the upper part of the branches are imbedded in 



limestone. 

 Fig. 2 5. A part of a stem enlarged, showing the openings on the surface. 

 Fig. 2 c. A longitudinal section, showing the arrangement of the cells. 



Position and locality. This species occurs in the lower part of the limestone at Lockport. 

 526. 3. CLADOPORA CERVICORNIS {n. sp.). 



Pl. XXXVIII. Fig. 3 a, b. 



Ramose, branches ascending, branchlets growing more on one side of the principal branches ; 

 cellular ; cells scarcely angular j openings upon the worn surface roundish or longitudinally 

 oval. 



This species is widely different from the preceding, though the specimens examined are not 

 in good condition j the direction of the cells is more ascending, or more nearly in the direction 

 of the axis of the stem. The form of the mouths in perfect specimens is unknown, but in the 

 worn surfaces it is quite different from any other species in the same condition. 



Fig. 3 a. A fragment of a branch of the natural size. 



Fig. 3 &. A portion enlarged, showing more distinctly the form of the apertures. 



Position and locality. In the lower part of the Niagara limestone at Lockport. 

 527. 4. CLADOPORA FIBROSA (n. sp.). 



Pl. XXXVIII. Figs. 4 a, b, and 5 a, b. 



Coral branching ; branches numerous, bifurcating ; cells numerous, small, closely arranged 

 and ascending ; openings upon the surface roundish, or subangular in worn specimens. 



This species has more the character of Ciletetes or Favosites than any other noticed, 

 though there is no evidence that it possesses transverse septa or pores in the walls of the cells. 

 From its habit, and the form of the mouths in weathered specimens, it is referred to the genus 

 under consideration. In the two specimens figured, and which possess some characters in- 

 ducing a belief that they are distinct species, the cells are filled, and separate in prismatic 

 forms, which are closely arranged, and have a direction more nearly parallel to the axis than 

 the last one, and differ widely in this respect from the preceding and following species. 



This species has the general aspect of Favosites fibrosa, and it is probably one among several 

 species that are often thus referred. 



Fig. 4 a. A small branch, showing a tendency to regular bifurcation in its mode of growth. 

 Fig. 4 b. An enlarged portion, showing the weathered openings and the fibrous or prismatic 



structure of the longitudinal section. 

 Fig. 5 a. A large branch, which is solid, and worn so as to show the prismatic structure. 

 Fig. 5 b. A portion enlarged, showing a structure and arrangement analogous to the preceding 



figure 4 b. 



