CORALS AND BRYOZOA. 189 



sition, the peristomes and the absence of strong septa; from T. (0.) ehngata it 

 is distinguished by the size of the branches, the larger and much more broadly 

 oval cell apertures, their more irregular and much closer disposition. 



Formation and locality. Hamilton group, Fallbrook, four miles east of Canan- 

 daigua lake, N. Y. 



CALLOPORA, Hall. 



(See jjages 21 and 75.) 



Callotrvpa, s. g., Hall. 



(See page 24.) 



Callopora (Callotrvpa) internodata. 



NOT FlaUliBD. 



Ccdlvpora internodata, Hku.. Trans. Albany Institute, vol. x, p. 182. 1881. 

 " " " Report of SUt(" Geologist for 1883, p. 16. 1884. 



Zoarium ramose; bifurcations frequent; branches diverging at an angle of forty- 

 five degrees, diameter from 1 to 2 mm. Cells tubular, arising from the 

 center of the branch. Cell apertures oval, length about .28 mm., width from 

 one-half to two-thirds the length, closely disposed, frequently nearly or quite 

 in contact, sometimes irregularly, and at other times regularly arranged in 

 longitudinal and oblique transverse, parallel rows, the transverse rows 

 being at an angle of forty degrees to the axis of the branch. Peristomes 

 moderately strong. Inter-apertural space occupied by minute angular pits, 

 the margins of which are elevated equally with the peristomes ; there are 

 also one or two conical nodes at each aperture, which form the most promi- 

 nent feature of the surface : sometimes when the cell apertures are very 

 closely arranged these nodes are apparently situated on the peristomes. 



This species resembles T. (0.) transversa in having oval cell apertures, dis- 

 posed in oblique transverse rows, but differs in having intermediate pits and 

 strong, conical nodes, and by the absence of granules. 



Formation and locality. Hamilton group, Darien Centre, Erie county, N. Y. 



