516 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 39. 



Zorium adnate, usually upon ramose or solid bryozoans or brachio- 

 pods; zooecia typically short, pyriform, with the stolon but slightly 

 developed; eight or nine zooecia in 5 mm.; angle of divergence 

 averaging 40°. Exclusive of the stolon a single specimen is 0.4 mm. 

 long and 0.26 mm. wide. The aperture has a distinct peristome, is 

 direct, circular, about 0.09 mm, in diameter, and situated near the 

 anterior end. 



The variability of this species has been noted in the previous 

 remarks upon the section. Reference to the illustrations (figs. 12 



a 



Fig. 15.— Coeynotrtpa inflata. a and 6, zoarium natural size, and a portion, X9; c, three 



ZOCECIA OF SAME, X18, SHOWING THE POROUS WALL; d, A VERTICAL SECTION OF A ZOCECIUM, X18. 



Upper third of the Trenton shales at Cannon Falls, Minnesota, e and /, small portion 



OP A COLONY INCRUSTING KAFINESQUINA ALTERNATA, X9 and X18; g, OUTLINE OF ZOCECIA, X18, 

 showing three "gems" springing from ONE PARENT CELL. CORRYVILLE BEDS OF McMlLLAN 

 FORMATION, CINCINNATI, OHIO. (AFTER ULRICH.) 



and 13) will show that the zooecia of such variable zoaria are normal 

 if the stolon is eliminated. 



The pyriform shape and the size of the zoarium combined with its 

 rather considerable angle of divergence, will distinguish C. injlata 

 from related members of the section. The Devonian and Jurassic 

 species, O. devonica and C smithi, have a very similar zoarium, but 

 in each instance their zooecia, so far as present knowledge goes, are 

 much smaller. The other members of the C. injlata section have 



