158 Thirty-second Report on the State Museum. 



small, oval, or suboval ; margins elevated; length about .30 mm., irregularly 

 arranged . 



This species is very similar, in general appearance, to L. torta (plate xv, 

 figs. 1-7), but may be distinguished from that one by its smaller and irregularly 

 arranged oval pores. 



Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



LlCHENALIA DISSIMILIS, n. Sp. 

 (PLATE XV, FIGS. 10-13.) 



Bryozoum consisting of large, irregularly undulating, foliate expansions, of 

 one mm. or more in thickness ; width of largest specimen observed 120 mm. ; 

 celluliferous on one side ; lower surface covered by a wrinkled epitheea ; cells 

 arising from the epitheea, and opening very obliquely to the surface, frequently 

 alternating, arched and imbricating ; slightly longer than wide ; length about 

 .65 mm. 



This species, in its cell-apertures, is very similar to Alveolites, and may 

 possibly belong to that genus. 



Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



CERAMOPORA, Hall 

 Ceramopora labeculoidea, n. sp. 



(PLATE. XVI, FIGS. 1, 2.) 



Bryozoum small, circular, very thin; cells commencing in the centre and 

 radiating nearly to the margin, comparatively large, cylindrical or nearly so, 

 very oblique to the surface, .25 mm. in diameter at the aperture ; apertures 

 arched, arranged in alternating and imbricating series. The bryozoum for a 

 short distance from the margin is free from cells and undulating ; lower surface 

 covered by an epitheea, and concentrically wrinkled. 



This species differs from C. niacidata (plate xvi, figs. 5-11), in being much 

 thinner, the cells proportionately larger, more oblique and radiating from the 

 centre to the margin without maculae of larger cells. It bears a very close 

 resemblance to C. labecula of the Niagara group, and may belong to that 

 species. 



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



Ceramopora parvicella, n. sp. 



(PLATE XVI, FIGS. 3, 4.) 



Bryozoum thin, foliate, incrusting, celluliferous on one side. Cells consisting 

 of very oblique, subcylindrical tubes, opening rectangularly to the plane of the 

 surface, having frequent maculae where the cells are larger than in other por- 

 tions ; diameter of ordinary cell-tubes at aperture .25 mm., of the larger ones 

 .3 mm. ; apertures arched or triangular, arranged in alternating and imbri- 



