Upper Helderherg Group. 



149 



opening directly outward ; apertures circular, diameter from .25 to .33 

 mm., irregularly disposed ; the surface has maculae destitute of aper- 

 tures, from 1 to 1.5 mm. in diameter; apertures nearest the maculae 

 slightly larger than the others, margins strongly and equally ele- 

 vated, intermediate space sometimes with shallow angular pits. 

 Locality — New York. 



Callopora aculeolata, n, sp. 



Kamose ; diameter of branches two mm.; cells opening directly out- 

 ward; apertures circular or nearly circular, length .45 mm., distance 

 between varying from contiguity to .25 mm.; margins strong and dis- 

 tinctly elevated, and having from one to three comparatively strong 

 nodes; intermediate space occupied by minute angular pits, usually 

 one or two series between two adjacent apertures. 



Callopora multiseriata, sp. 

 Ramose, solid ; branches diverging at an angle of 80°, diameter two 

 mm.; cells tubular, cylindrical ; apertures oval, length .33 mm., irreg- 

 ularly disposed; margins thin, not elevated, intermediate space with 

 minute angular pits arranged in longitudinal rows giving a striated 

 appearance to the surface ; from 5 to 10 series betweer^ adjacent aper- 

 tures. 



Locality — Warner's Quarry, south of Leroy, Genesee county, N. Y. 



Lie HEN ALIA, Hall 



Lichen A LI A substellata, n. sp. 

 Lamellose expansions, free or encrusting, or forming masses by su- 

 perimposition; each layer usually one mm. in thickness ; cells tubular, 

 varying in length from .25 to 4 mm. ; apertures usually circular, di- 

 ameter .28 mm., closely and irregularly arranged; surface with macu- 

 lae, usually elevated, the centers with out apertures ; cells radiating from 

 maculae larger and more oblique than the others; apertures variable, 

 sometimes opening directly outward, margins equally elevated, but 

 usually oblique ; margins unequally elevated, occasionally very oblique 

 and imbricating, the most strongly elevated portion 2:)roduced and spini- 

 form, sometimes bidenticulated ; cell-tubes septate, eight septa in 

 space of one mm.; freq\iently contorted. 



Locality — Falls of the Ohio river. 



Li CHEN ALIA DENTICULATA, 11. Sp. 



Lamellose expansions, or massive by siiperimposition of layers ; 

 cells tubular, diameter .23 mm., one-half of the margin is very 



