160 Thirty-second Report on the State Museum. 



small cells ; but on examination its characters are more like those of a Bryozoan, 

 especially the projections at the angles of the cell- walls. 



Formation and locality. In the shaly limestone of the Lower Helderberg 

 group, at Schoharie, N. H. 



PALESCHARA, Hall. 



PALESCHARA ? RADIATA, U. Sp. 

 (PLATE XVI, FIGS. 13, 14.) 



Bryozoum consisting of a thin expansion incrusting other bodies. Cells polyg- 

 onal, contiguous, oblique ; apertures about .25 mm. in diameter ; irregularly 

 arranged, radiating from a central point. 



Formation and locality. Lower Helderberg group, near Clarksville, N. Y. 

 Paleschara incrustans. 



(PLATE XVI, PIGS. 15-22, ? 24.) 



Paleschara incrustans, Hall. Twenty-sixth Rep. N. Y. State Mug. Nat. Hist., 



p. 106. 1874. 



Bryozoum growing in Flustra-like expansions ; incrusting. Cell-apertures 

 polygonal, about .65 mm. in diameter ; occasionally there are maculae where 

 the cells are slightly larger ; cell-walls thick, their margins sometimes elevated 

 at the angles of the apertures into obtuse projections, which are not sufficiently 

 long to be characterized as spines. 



The mode of growth is not dissimilar from that of a recent Flustra in its 

 earlier stages, but the cells are less regularly arranged, and the whole has a 

 stronger and firmer aspect. 



Formation and locality. In the shaly limestones of the Lower Helderberg 

 group, near Clarksville, N. Y. 



Paleschara? bilateralis, n. sp. 



(PLATE XVI, FIGS, 22. 23.) 



Bryozoum membraniform ; fronds large, very thin, celluliferous on both sides ; 

 mesial plate or epitheca wrinkled, and with fine transversely concentric lines. 

 Cells very slightly elevated, and a little oblique ; variable in size, form and 

 arrangement, from quadrangular to polygonal, generally longer than wide, with 

 maculae where the cells are larger than in other portions of the frond ; length 

 of the ordinary cell-apertures about .30 mm. ; of the larger ones about .75 mm. ; 

 sometimes the length is equal to twice the width. 



This is a distinct and very easily recognized species ; the cells have sometimes 

 a very regular arrangement, proceeding from a certain point in straight rows, 

 slightly diverging, other similar rows coming in between ; when having this 

 regularity, the sides of the cells are parallel, and the angles nearly rectangular ; 



