162 Thirty-second Report on the State Museum. 



inencenient of the celluliferous portion, when the sides become parallel ; cellu- 

 liferous on both sides. Cells arising obliquely from a thin, mesial lamina; aper- 

 tures oval, rhomboidal, and occasionally hexagonal ; on the central portion of 

 the stipe the cells are of nearl} 1 - uniform size, and arranged in longitudinal rows ; 

 there being fifteen cell-apertures in the space of five mm. longitudinally, and 

 twenty in the same space transversely ; longitudinal partitions thicker than the 

 transverse. On the marginal portion the cells are larger, proportionally longer, 

 more irregularly arranged and oblique to the others. 



The transverse partitions widen at their junction with the longitudinal parti- 

 tions, and frequently have a pore on the expanded portion. A single specimen 

 has nodes similar to E. nebulosa. 



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

 groups, Albany and Schoharie counties, N. Y. 



EsCHAROPORA NEBULOSA. 



(PLATE XVII, FIGS. 14-16.) 



Escharopora nebulosa, Hall. Twen':y-sixth Rep. N.Y. St. Mas. Nat. Hist., p. 99. 1874. 



Bryozoum a thin foliate expansion, having a striated base ; becoming abruptly 

 wider and thinner at the commencement of the celluliferous portion ; cellulifer- 

 ous on both sides. Cells arising obliquely from a thin, mesial lamina, arranged 

 in parallel, longitudinal rows, rarely interrupted by intercalation of new rows, 

 and then diverging slightly ; apertures oval or quadrangular, occasionally hex- 

 agonal, a little longer than wide ; twelve in the space of five mm. longitudinally, 

 and eighteen in the same space transversely ; longitudinal partition walls thin, 

 rounded on the edges ; transverse partitions thinner and depressed ; the surface 

 is marked by numerous nodes where the cells are larger than on other portions 

 of the frond ; thickness of the frond one and one-half mm. ; width of the largest 

 specimen observed more than fifty mm. 



This species differs from E. tenuis, pi. xvii, figs. 7-13, in its greater breadth, 

 nodulose surface, and the proportionally shorter cell-apertures. 



Formation and localities. Lower Helderberg group, Catskill creek and 

 Clarksville, N. Y. 



ESCHAROPORA ( ? PALESCHARA) BIFOLIATA. 



(PLATE XVII, FIGS. 17, 18.) 



PaUncTiara bifoliata, Hall. Twenty-sixth Rep. N.Y. St. Mus. Nat. Hist , p. 107. 1874. 



Bryozoum growing in broad, foliate expansions, celluliferous on both sides. 

 Cells arising obliquely from a mesial lamina ; thickness of frond slightly more 

 than one mm. ; greatest width of an imperfect frond eighty mm. ; cell-apertures 

 rhomboidal or hexagonal, appearing oval on worn surfaces ; diameter of aper- 

 ture .25 mm.; there are frequent nodes having slightly larger cells than the 

 other portions ; cell-walls thin ; cells more or less regularly arranged in undu- 

 lating intersecting lines. 



