The Fauna of the Maxvillc Limestone. 365 



1906. Fenestella serratula. Cumings, Ind. Dept. Geol. Nat. Res., 30th. 

 Ann. Rept., p. 1280, pi. 30, figs. 2--2c, 3-3a. 

 Salem limestone : Bedford, Indiana. ; 



Description. — "Zoarium a foliar expansion, from 3 to 5, 

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

 five or twent3'-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 anct 

 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 branches, depressed and carinate on the 

 obverse side. Fenestrules narrow elliptical, seventeen to nine- 



FiG. 5. — Fenestella serratula. A branch enlarged twenty diameters to 

 show the apertures and the nodes on the mesial carina. 



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

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

 age [Ulrich, 1890]." 



The Maxville forms are like the Chester specimens in that 

 they lack the granules on the longitudinal stri?e of the obverse 

 side. More strictly speaking, the obverse side instead of having 

 striae is marked with very fine longitudinal plications, which 

 bifiuxate and diverge toward the top. 



Horizon and locality. — Maxville limestone. 

 Shale-nodular zone : Kroft Bridge, White Cottage. 

 Undetermined zone : Harper Shaft, Olive Furnace. 



