l62 NEW YORK STATE MUSEUM 



tentacles — the lophophorc. The colony is commonly attached to 

 foreign bodies, which it either incrusts or from which it arises as an 

 independent frond. 



In the Paleozoic genera the cell apertures are often surrounded by 

 elevated rims, or peristomes. In many forms a portion of the pos- 

 terior wall of the tube is more or less thickened, and curved to a 

 shorter radius, often projecting above the plane of the aperture. 

 This forms the lunaria, and their ends may project into the tubes as 

 psetidosepta. In the interapertural space may occur angular or ir- 

 regular cells, the mesopores, while on many portions of the surface, 

 tubular spines (acanthopores), or nodes (rounded, knob-like eleva- 

 tions), may occur. At intervals, in many genera, rounded eleva- 

 tions, or monticules, are found, which may, or may not, be destitute 

 of cells. Maculae or irregular blotches, destitute of cells, also occur 

 in many forms. Some species bear a superficial resemblance to cer- 

 tain corals, particularly the monticuliporoids. 



Genus diploclema Ulrich 



[Ety. : (5J-/009, double; y-Xruj-a ^ twig] 



(1890. Geol. sur. Illinois, 8:368) 



Zoarium dendroid, branches slightly compressed, spreading in 

 the same plane ; zooecia tubular, diverging from 

 a wavy mesial mesotheca; apertures circular; 

 " ,• t prominent.'^ 



, , \ Diploclema sparsa (Hall) (Fig. 57). T r e - 



' ' ■/ b M" nia-topora s p a r s a Hall (1852. Pal. N. Y, 

 I 2:155, pi. 40A, fig. I2a-d) 



Distingnishing characters. Slender, cylindric 

 enSgeL?t?^o?Tresh^ and bifurcating stcms ; distant cells, opening ob- 



wom lors-ncliGS 



iiquely upward; elongated nariform calicles. 

 Found abundantly in the Rochester shale at Lockport (Hall) 

 probably also at Niagara. 



Genus ceramopora Hall 



[Ety.: ■/.ipap.o'i, a tile; ~6po(;^ pore] 



(1852. Pal. N. Y. 2:168) 



Zoarium disk-like, free or attached by the center of the base; 

 under surface with one or more layers of small, irregular cells; zooe- 



^The generic descriptions of the Bryozoa are adapted or transcribed from 

 Nickles & Bassler; Synopsis of American fossil Bryozoa. U. S. geol. sur. 

 Bui. 173. I have also followed these authors in the synonomy of the species. 



