164 NEW YORK STATE MUSEUM 



Chilotrypa ostiolata (Hall) (Fig. 60). Trematopora o s - 

 t i o 1 a t a Hall (1852. Pal. N. Y. 2 1152, pi. 40A, fig. 5a-n) 



Distinguishing characters. Irregularly branching cylindric stems 

 gradually tapering toward the extremities, which are obtuse; aper- 



Fig. 60 Chilotrypa ostiolata ; branch natural size and two enlargements 



tures about their diameter apart, arranged in spirally ascending 

 lines or irregularly; strong peristomes; interapertural spaces smooth; 

 stems solid or incrusting crinoids. 



Found abundantly in the Bryozoa beds of the Rochester shale 



and in some of the calcareous layers 

 below it in the Niagara sections. 

 n ., Also at Lockport, etc. (Hall). 



fSFyK' -..■ 



' f f , r Genus batostomella Ulrich 



""' [Ety.: [idroq, bramble; G-6p.a, mouth] 

 (1882. Cin. soc. nat. hist. Jour. 5:154) 

 Fig 6i Batostomeiia granuiifera with en- Zoarium ramose, branches slen- 



largement of part of surface . . . 



der; zooecia with thick walls m the 

 mature region and with few diaphragms in the peripheral region, 

 often centrally perforated; apertures small, circular or oval; inter- 

 spaces rounded or canaliculate, spinulose; acanthopores smah and 

 usually very numerous; mesopores small, with subcircular openings. 



Batostomella granuiifera (Hall) (Fig. 61). Trematopora 

 granuiifera Hall (1852. Pal, N. Y. 2 1154, pi. 40A, fig. 9*-e) 



Distinguishing characters. Slender branches; oval to elongate 

 apertures, margined by wavy, raised, granulose lines, which are 

 double between the cells. 



