150 



Bryozoans of the 



strongly elevated, frequently projecting over the aperture, with two 

 strong denticulations; apertures crowded : surface with numerous ele- 

 vated maculae; cells contiguous to centers of some maculae larger than 

 others, bases of macule contiguous ; interior intercellular space with 

 tubuli; diameter of tubuli .12 mm. divided by numerous septa. 



Locality — Falls of the Ohio river. 



LiCHENALIA LISTRIATA, 11. Sp. 



Celluliferous on one or both sides, sometimes massive by superim- 

 position of iayers; diameter of cells .36 mm.; apertures closely ar- 

 ranged, margins not distinctly elevated ; interior intercellular spaces 

 vesiculose; vesicles irregularly arranged. On the interior of the cell- 

 tubes, situated close together, are two strong striations, which appear 

 on the surface as denticulations, projecting from one-half to two- 

 thirds across the aperture; this feature distinguishes it from all other 

 species. 



Locality ■ — Falls of the Ohio river. 



LiCHEXALIA CEUSTACEA, 01. Sp. 



Lamellate expansions, or massive; layers sometimes not more than 

 .25 mm. in thickness; apertures circular, diameter .33 mm., irregu- 

 larly arranged, sometimes so closely arranged as to be distorted ; mar- 

 gins irregularly elevated, not denticulated; surface frequently broken; 

 at the margin the cells are very oblique ; surface with elevated maculae; 

 interior vesiculose. 



Locality — Falls of the Ohio river. 



LlCHEJfALIA SUBCAYA, n. Sp, 



This species is distinguished from all others of this genus as fol- 

 lows: The elevated maculae of the surface are entirely destitute of all 

 apertures, and the space beneath them is hollow; intercellular space 

 of interior of bryozoum yesiculose; apertures subtriangular, width .'^^0 

 mm. 



Locality — Falls of the Ohio river. 



LiCHEXALIA ALTERXATA, U. Sp. 



Lamellate expansions ; greatest thickness observed .75 mm. ; cells 

 closely arranged, very oblique, alternating and imbricating: apertures 

 broadly oval, length .35 mm., slightly elevated maculae, distant 5 

 mm., with cells slightly larger than the others, not radiating ; space 



