BRYOZOA. 619 



PlNNATOPORA TEXUIRAMOSA Ulrich, 

 PL LXYI. &g. 7. 



Of this species only the reverse aspect has been observed. The 

 best fragment seen preserves a portion of the primary branch 

 about 1 cm. long. This is about 0.6 or 0.7 mm. wide, and 

 on one side throws off three, on the other only one secondary 

 branch, varying in width from 0.5 to 0.6 mm. The primary 

 and secondary lateral branches or pinnae, diverge at angles of 

 from 70 to 80. are slender, about one-third as wide as the 

 principal branches, from less than 1 to nearly 3 mm. long, 

 those proceeding from the primary branch the longest, with 

 twelve or thirteen given off on each side in the space of 1 cm. 

 Surface of both branches and pinnae marked with fine but dis- 

 tinct longitudinal striae. 



The characters relied upon in distinguishing this species are 



(1) the number and comparative slenderness of the pinnae, and 



(2) the great length of those that proceed from the sides of 

 the primary branch. 



Position and locality: Waverly group, near Richfield, Ohio. 



PlXNATOPORA BELLULA Ulrich. 

 PL LXVI, &g. 8-8b. 



Zoarium a very slender, small, pinnate frond. Midrib between 

 0.2 and 0.3 mm. wide, throwing off subalternately from the two 

 sides, at an angle of about 50. the pinnae, which have a width 

 of about 0.18 mm., and a length varying between 0.5 and 1 

 mm. Five pinnae on each side in 5 runi. Reverse side rounded, 

 granulose, the granules arranged in parallel longitudinal series 

 on fine elevated lines. Obverse face subangular or rounded, 

 without carina. but marked with flexuous striae, strongest near 

 the center of the midribs, where also a row of small and widely 

 separated (0.8 mm.) nodes may be observed. Zocecia in one 

 range in both midrib and pinna?. Apertures in two alternating 

 ranges, with about twelve in each in 5 mm., circular, 0.1 mm. in 

 diameter, surrounded by well developed peristome. They are 



