BRYOZOA. 617 



Named as a slight token of my appreciation of the labors of 

 Mr. G. R. Tine on the Bryozoa of Great Britain. 



Position and locality: Keokuk group, King's Mountain, Ky., 

 Keokuk. Iowa, and in the Cuyahoga shales at several localities 

 in Ohio. 



PETNATOPORA FLEXUOSA Ulrich. 



PL LXVI, fig. 4-4c. 



Zoarium pinnate, midrib 0.5 to 0.6 mm. wide, branchlets 0.3 

 to 0.4 mm. wide, and, when entire, about 2.5 mm. long. En- 

 tire obverse face, between the zooecia apertures, marked with 

 strong flexuous striae, those along the center of the branches a 

 little the strongest. An occasional tubercle present. On the 

 reverse both midrib and branchlets are rounded and finely 

 striated longitudinally. Near the junction of the latter with 

 the midrib, a small circular pore is often found. Lateral 

 branches sub-alternating, comparatively remote, averaging five 

 on each side in 1 cm., directed more or less distally. Zooecia 

 apertures in two alternating ranges, between ten and eleven in 

 5 mm., circular about 0.12 mm. in diameter, with well devel- 

 oped peristome. 



This species is easily recognized by the rather remote lateral 

 branches, the non-development of a carina. and, particularly, 

 by the strong flexuous striations on the obverse side. The 

 peristomes too are stronger and more elevated than usual. 



Position and locality: Keokuk group, King's Mountain, Ky. 



PlNNATOPORA STRIATA UMch. 

 PL LXVI, fig. 4d. 



Zoarium pinnate; midrib 0.5 to 0.7 mm. wide; branchlets 

 from 1 to 2 mm. long, 0.3 to 0.4 mm. wide, directed somewhat 

 distally. and fully as much toward the obverse side. Reverse 

 of midrib with rather coarse, unequal, longitudinal striae. Lat- 

 eral branches opposite or alternating on the two sides of the 

 midrib, with an average of nearly seven on each side in 1 cm. 

 77 



