152 



Bryozoans of the 



the surface are broad elevations the centers of which are essentially 

 flat and without apertures, distance from centres 17 mm., width at 

 base 5 mm., surface finely granulose ; sometimes obscure ridges from 

 one aperture to another. 



Locality — Onondaga Valley, IS". Y. 



LlCHENALIA LU^TATA, 11. Sp. 



Lamellate, or massive ; cells tubular, diameter at aperture .38 mm., 

 margin of one-half slightly elevated or entirely wanting the other half 

 strongly elevated, projecting over the aperture, the central portion 

 more extended, giving to the aperture a cunate form, which distin- 

 guishes it from other species; apertures irregularly arranged ; sur- 

 face with gently elevated maculae the centers of which are distant from 

 each other about 5 mm. 



Locality — Falls of the Ohio river. 



Lichen ALT A alteata, 7i. sp. 

 Lamellate expansions ; cells tubular, oblique or at right angles to 

 the surface; usually alternating and imbricating; apertures closely 

 arranged; diameter .45 mm., margins unequally elevated, the stronger 

 portion, comprising one-half, strongly elevated, projecting, with two 

 slight denticulations, sometimes the upper portion of the cell- wall 

 is exposed nearly its entire length ; surface with numerous elongate 

 concave maculdd, without cell-apertures, four mm. in length and one 

 in width, forming narrow channels, interior intercellular space vesi- 

 culose. 



Locality — ^Falls of the Ohio river. 



Lichen ALT A eadiata, n. sp. 



Lamellate; cell-apertures usually oblique, sub triangular, irregularly 

 disposed, diameter .50 mm., margins unequally elevated, one portion 

 strongly elevated, projecting over and giving to the aperture an arched 

 or triangular form ; maculae broad, circular, distant from six to eight 

 mm., slightly elevated centers without cell-apertures, granulose; cells 

 radiate very distinctly from the centers; interior intercellular space 

 vesiculose. 



Locality — Onondaga Valley, N. Y. 



LiCHENALIA PALIFOEMTS, 11. Sp. 



Ramose, hollow; diameter 3 mm., thickness of bryozoum .50 mm., 

 apertures with a diameter of .20 mm., usually closely and irregu- 

 larly disposed, but sometimes in oblique transverse lines; at the base 

 of each aperture are two slight denticulations extending to and par- 



