164 NEW YORK STATE MUSEUM 



Chilotrypa ostiolata (Hall) (Fig. 60). Trematopora os- 

 t i o 1 a t a Hall (1852. Pal. N. Y. 2 :i52, pi. 40A, fig. 5a-n) 



Distmguishing 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. 

 Also at Lbekport, etc. (Hall). 



Genus batostomella Ulrich 



[Ety.: iSdro?, bramble; (rru/ia, mouth] 



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



Fig 61 Batostomella granulifera with eu- Zoarium ramOSC, braUChcS slcn- 



largement of part of surface . . , , . , 1 1 • i 



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 canahculate, spinulose; acanthopores small and 

 usually very numerous ; mesopores small, with subcircular openings. 



Batostomella granulifera (Hall) (Fig. 61). Trematopo'ra 

 granulifera Hall (1852. Pal. N. Y. 2 :i54, pi. 40A, fig- Q^-e) 



Distinguishing characters. Slender branches; oval to elongate 

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

 double between the cells. 



