154 Thirty- second Report on the State Museum. 

 Callopora cellulosa, n. sp. 



(PLATE XII, PIGS. 7-9, AND PLATE XIII, FIG. 9.) 



Bryozoum ramose, solid, branching infrequently ; diameter of larger branches 

 about four mm. ; cell-tubes arising from the centre of the branch, gradually 

 diverging, curving outward to near the surface, when they turn quite abruptly 

 to the surface; diameter at aperture about .15 mm.; apertures irregularly 

 arranged, the distance from each other varying from contiguity to two or more 

 times their diameter ; margins elevated ; intercellular spaces occupied by small 

 polygonal pits, generally in two, occasionally three ranges ; margins elevated ; 

 in well-preserved specimens the margins of both the cells and intercellular pits 

 have small, short spines. 



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

 group, near Clarksville, N. Y. 



Callopora fistulosa, n. sp. 



(PLATE XII, FIGS. 1-6.) 



The surface of this species very much resembles Callopora cellulosa, but 

 differs in having frequent large openings which continue to the centre of the 

 branch ; the space surrounding the opening being much elevated and strongly 

 striated. It may be a different mode of growth of the preceding species. 



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

 Callopora perelegans. 



(PLATE XII, FIGS. 10-17.) 



Callopora peielegans, Hall. Twenty-sixth Rep. N. Y. State Mus. Nat. Hist., 



p. 102. 1874, 



Bryozoum ramose, solid ; branches very frequent, not widely diverging ; 

 diameter from three to seven mm. ; cell-tubes commencing in the centre of the 

 branch, gradually enlarging and curving to the surface ; length of tubes three 

 mm. ; diameter at aperture nearly .50 mm. ; circular, or sometimes slightly 

 subangular at their junction with the intercellular pits ; distance from each 

 other varying from contiguity to more than their diameter ; cell-margins elevated, 

 and occasionally, in well-preserved specimens, spinulose ; intercellular spaces 

 occupied by comparatively large, polygonal pits, in from one to three ranges, 

 variable in size and shape ; frequently, where only one range occurs, the length 

 is more than twice the width ; the transverse septa across the intercellular 

 spaces are very regular and distinct. 



This species is very similar to Callopora elegant ula of the Niagara group, 

 differing from it only in its more marked intercellular pits. 



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

 group, near Clarksville, N. Y. 



