CORALS AND BRYOZOA. 255 



Stictopora palmipes. 



PLATE LX, FIGS. 19, 20. 



stictopora palmipes. Hall. Trans. Albany Institute, vol. x, p. 189. 1881. 

 " " " Report of State Geologist for 1883, p. 41. 1884. 



ZoARiUM consisting of a flattened, dichotomously branched frond ; base thin, 

 spreading, attached to foreign bodies ; for a distance of 2 mm. above the base 

 the stipe is nearly cylindrical, with a diameter of less than 1 mm., theii 

 rapidly expanding to a width of 3 mm. The mode of growth is different 

 from that of the usual forms of Stictopora ; in addition to the ordinary 

 bifurcating branches there are intermediate lateral branches or lobed expan- 

 sions, which are very short, not exceeding 1.50 mm. in length and generally 

 about 1 mm. wide, with the extremities, rounded ; transverse section 

 lenticular, greatest thickness observed 50 mm.; the non-celluliferous mar- 

 gin is flat, very thin, having a width .50 mm or more, bordering the entire 

 frond, occupying all the space between the lobes or lateral branches ; the 

 celluliferous portion has thus somewhat the appearance of incrusting a flat, 

 smooth surface. Cells tubular, recumbent, for a portion of their length 

 abruptly curving and opening directly outward. Intercellular tissue con- 

 sisting of irregularly disposed vesicles. Cell apertures oval, length about 

 .20 mm., width a little more than one-half the length, disposed in regular 

 longitudinal rows, the apertures of the marginal rows being a little larger 

 than the others. Peristomes thin, equally elevated, not denticulated on 

 the fronds observed. Rows of apertures separated by prominent ridges, 

 having a width of .10 mm or more, much elevated above the peristomes, 

 and very frequently partially obscuring the apertures and having conspic- 

 uous, equi-distant, conical nodes, ten in the space of 5 mm. 



Formation and localities. Shales of the Hamilton group, West Hamburg, Erie 

 county ; Pavilion, Genesee county, and near Canandaigua lake, Ontario county, 

 New York. 



