The fauna of the Maxrillc Limestone. 365 



190G. rciicstclla scrratula. Cumings, Jnd. Dept. Geol. Nat. Res., 30thi 

 Ann. Rept.. p. 1280. pi. ;5U, figs. -J-'-'c, 3-3a. 

 Salem limestone; liedford, Indiana. 



Description. — "Zoariuni a foliar expan.sion, from 3 to 5;, 

 cms. in diameter. Ih-anches rigid, small, 0.25 mm. wide, twenty- 

 five or twenty-six in i cm., with a comparatively strong mesial, 

 carina, carrying small nodes, which give it on a side view the- 

 serrated appearance that has suggested the name. Nodes and 

 zoecia twenty-four to twenty-six in 5 mm., and three to each 

 fenestrule. Apertures very small, 0.07 mm. in diameter with a. 

 prominent peristome when perfect. Dissepiments thin, not more- 

 than half as wide as the hranches, depressed and carinate on the 

 obverse side. Fenestrules narrow elliptical, seventeen to nine- 



Fif;. 5. — l''ciicstclla scrratula. A l)ranch enlarged twenty diameters to 

 show the apertures and the nodes on the niesial carina. 



teen in one cm. Reverse of branches granulo-striate or nearly 

 smooth ( ? ) with an occasional long, barbed, spine-like append- 

 age [Ulrich, 1890]." 



Idle ^iaxville forms are like the Chester specimens in that 

 they lack the granules on the longitudinal stride of the obverse 

 side. J\Iore strictly si)eaking, the obverse side instead of having 

 striae is marked with ver}' hue longitudinal plications, wliicli 

 bifurcate and diverge toward the top. 



Hori::on and localitv. — Maxville limestone. 

 Shale-nodular zone: Kroft l>ridge. White Cottage. 

 Undetermined zone: ITarper Shaft, Olive •''urnace. 



