CLINTON OKOtTf. 49 



of a palmate form. Many specimens are marked by a ramose elevated ridge upon the sur- 

 face, which, however, scarcely disturbs the regular arrangement of the cellules. 



Firr. 1 a. Frag-ment of the natural size. 



Fig. 1 J. A fragment of the natural size, showing a ramose elevated ridge running over the 



surface. 

 Fig. 1 c. A portion enlarged, showing the form and arrangement of the cells. 



Position and locality. In the thin calcareous and semi-calcareous layers at Flamborough 

 Head, Canada West. estate Collection.) 



430. 2. RHINOPORA TUBULOSA(n. 5/?.). 



PL. XIX. Fig. 2 a, 6, c. 



Corallum somewhat flattened, semi-cylindrical, hollow, celluliferous over the entire surface ; 

 pores small, round and. elevated above the surface, distant from each other a little more than 

 their diameter ; openings round. 



Cellules 80 to 85 in the length of an inch. 



This species is readily distinguished from the preceding, by its smaller and more closely ar- 

 ranged pores. In fragments it occurs as a thin expanded crust ; but the only specimen seen, 

 which approximates to a perfect form, is the one described, where the poriferous faces are se- 

 parated by a flattened semi-cylindrical hollow space, instead of having the bases of the cells in 

 contact, and forming a thin explanate frond, as in the preceding and other known species. 

 Fragments of this, and perhaps other species of similar character, may be frequently found 

 having only one side celluliferous. 



Fig. 2 a. A fragment of this species, of the natural size. 



Fig. 2 5. A section of 2 a, showing the form, the interior being filled with shaly matter. 



Fig. 2 c. A portion of the surface enlarged, showing the form and arrangement of the cellules. 



Position and locality. In the green shale of this group at Sodus in Wayne county, also at 

 Reynale's basin, Niagara county. 



431. 4. RETEPORA ANGULATA (n. sp.). 



Pl. XIX. Fig. 3 a- A. 



Frond much expanded (perhaps cyathiform originally) ; branches anastomosing ; fenestrules 

 large, very oblong-oval or irregularly subrhomboidal, varying in size ; non-poriferous face 

 striated ; poriferous face with two or three rows of pores on each branch ; pores small, round, 

 salient, papilliform. 



The larger and best preserved specimens of this coral are in shale, and, to the eye, and even 

 to an ordinary magnifier, both faces are smooth. In some smaller fragments in calcareous 

 layers, the pores are very prominent. In some of the specimens in shale, the pores appear 

 [ Paljeontolocy — Vol. ii.] 7 



