BRYOZOA. 495 



gonal lines less regular. The longitudinal ridges are stronger, 

 the rows of cells generally less, and the surface more convex in 



"weiicaua. 



Position and locality: Keokuk group; King's Mountain Tun- 

 nel, Ky.. and Bentonsport, Iowa. 



CYSTODICTYA PUSTULOSA Ulrich. 



PI. LXXYI, fig. 2, 2a. 



This species differs from C. lineata ("Am. Pal. Bry." Jour. 

 Cin. Soc. Xat. Hist. Vol. VII, p. 37, PI. II, fig. 4, 4c) mainly 

 in the fact that the hues which form so conspicuous a feature 

 on C. lineata are obsolete or almost wanting, and that the 

 apertures occupy the summits of prominent papilke. imparting 

 to the surface a strongly pustulose appearance, quite different 

 from what we find in C. lineata. A tangential section dividing 

 the zooecia just above their decumbent portion shows a very 

 peculiar feature, which I am not yet able to explain. Namelv, 

 the zocpcial cavity is here divided longitudinally by a line which 

 commencing at the posterior side of the subcircular wall, ex- 

 tends about three-fourths of the diameter to the opposite side. 

 A similar but shorter line has also been observed in a section 

 of C. lineata. These sections also show that the zooecial cavity 

 is larger in C. pustulosa than in C. lineata. 



Position and locality: Keokuk group; King's Mt. Tunnel, Ky.; 

 Keokuk, Iowa: Warsaw and Xauvoo. 111. 



CYSTODICTYA LIXEATA var. MAJOR Ulrich. 



PI. LXXYI, fis. 3. 



Comparison of sections of this form with those of typical 

 specimens of C. lineata has not developed any appreciable dif- 

 ference in internal structure. Externally this variety is more 

 robust and has three or four more rows of cells than the typi- 

 cal form. All the examples seen are badly preserved. Better 

 material may show differences which are not now obvious. 



