532 Repoet of the State Geologist. 



SCALARIPORA, Hall. 



(Trans. Albany Institute, Yol. X, p. 159. 1881.) 

 Type, Scalaripora scalariformis^ Hall. 



(Plate 12, figs. 16-22.) 

 Zoarium consisting of groups of triangular prismatic branches, 

 celluliferous on each face ; sides of branches concave and crossed 

 by transverse, elevated, celluliferous scalse ; cells tubular, arising 

 from the radiating mesothecse of. the branches and from the 

 mesotheca of the scalse ; margins of the branches and soalae non- 



celluliferous. 



Stiotocella., no v. gen. 



(Plate 10, figs. 6,7.) 



Type, Stictocella sinuosa, Hall (sp.). 



Zoarium consisting of flattened bifurcating branches, cellulif- 

 erous on each face ; cell apertures oval, irregularly disposed ; 

 peristomes equally elevated; interapertural space occupied by 

 short irregular ridges, which are frequently covered by minute 

 nodes, giving to the surface of some of the species a granular 

 appearance. 



This species differs from Stictopoka in the irregular disposi- 

 tion of the cell apertures, and in the presence of the irregular 

 ridges between the cell apertures. 



Stictopokina, nov. gen. 

 (Plate 10, fig. 8.) 



Type, Stictrporina suhcarinata, Hall (sp.). 



Zoarium^ consisting of flattened bifurcating branches, cellulif- 

 erous on each face; cell apertures arranged in longitudinal 

 parallel rows, circular; peristomes prominent; apertures of the 

 two central rows the smallest, gradually enlarging to the outer 

 row ; margins of branches solid ; transverse section of the 

 branches lenticular; central rows of apertures separated b}^ a 

 ridge, sometimes the adjacent two rows are also separated by a 

 carina. 



This form has some resemblance to T^fnopoRA (and is erro- 

 neously given by Miller as a synonym), but aitfers from that 

 genus in its more decidedly bifurcating mode of growth, and in 

 the form of its transverse section. In this genus a section is 

 lenticular, the most gently rounded near the base, while in 



