CORALS AND BRYOZOA. 47 



Fenestella Noe, n. sp. 



PLATE Xni, FIGS. 19-22. 

 Fenestella, sp. Report of State Geologist for 1882. Expl. pi. 13, figa. 19-22. 1883. 



Form not definitely known. Branches slender, rounded and smooth, increasing 

 in size more or less gradually according to the frequency of the bifurcations, 

 which occur at intervals of from 2 to 15 mm., generally about 7 mm. 

 Interstices wider than the branches. Dissepiments very slender, irregularly 

 disposed; four or five in the space of 5 mm., on the same plane with the 

 branches. Fenestrules sub-quadrangular, varying in size, width generally 

 one-fifth to one-half the length. 



On the celluliferous face the branches are angular, nodose along the mid- 

 dle and the dissepiments are depressed. Fenestrules of about the same 

 appearance as on the opposite face. Cell apertures circular, in two ranges, 

 opening somewhat laterally, eighteen in the space of 5 mm. ; margins 

 elevated, indenting the borders of the fenestrules. 



Width of branch above bifurcation .25 mm., increasing to .55 mm. 

 Diameter of dissepiments .20 mm., length of fenestrules .75 to 1.50 mm. 



Formation and localilij. Lower Helderberg group, near Clarksville, N. Y. 



Fenestella Spio, n. sp. 



PLATE XIX, FIG. 16. 

 FenegteUa sp. f Hall. Report of State Geologist for 1882. Expl. pi. 19, fig. IG. 1883. 



Bbyozodm infundibuliform, compact. Branches moderately slender, angular, 

 frequently sinuous or zigzag on the non-celluliferous face. Bifurcations 

 infrequent. Interstices wider than the branches. Dissepiments strong, 

 angular, seven or eight in the space of 5 mm., expanded at their junction 

 and on the same plane with the branches. Fenestrules broadly oval or cir- 

 cular, width nearly or quite equal to the length. 



On the celluliferous face the branches are nodose and angular, or very 

 abruptly rounded, and appear much narrower than on the opposite face. 



