The Fauna of ilic Ma.vviUc Limestone. 395 



1909. Cy[^rlcardeUa obloiiga. Grabau and Shimer, N. A. Index Foss.^, 

 p. 535, fig. 728. 

 St. Louis : Indiana. 

 Ste. Genevieve : Kentucky. 



Description. — "Shell oblong, sub-qiiadrangular anterior 

 end, narrow, rounded ; posterior end broader, flattened, and 

 almost vertically truncate ; cardinal margin nearly straight and 

 horizontal behind, declining in front ; base nearly parallel to 

 the hinge-line ; beaks small, somewhat prominent, gibbous below ; 

 posterior umbonal slope gibbous or sub-angular, and extending 



Fig. 20. — Cypricardella oblouga. A view of a right valve, enlarged four 

 times. 



obliquely downward and backward to the base of the truncation ; 

 lunule small, ovate, deep in the center ; escutcheon linear distinct. 



"Length, .09 to .30; width, .06 to .20 of an inch [Hall, 

 1883].-' _ 



Horizon and locality. — Maxville limestone. 

 Lower zone: Cut No. 4, Mt. Perry-Fultonham. 



CLASS SCAPHOPODA. 



DENTALIUM ILLINOIE^■SE— Worthen. 



1883. Dentalium lUinoiense. Worthen, Geol. Surv. 111., Vol. VII, p. 325. 



Chester limestone': Chester, Illinois. 

 1890. Dentalium illinoieiise. Worthen, Geol. Surv. 111., Vol. VIII, p. 

 145, pi. 23, fig. 1. 

 Chester limestone: Chester, Illinois. 

 Description. — "Shell above a medium size, long, straight, 

 cylindrical, slightly tapering, scarcely inflated at the aperture. 

 Surface apparently smooth originally, but slightly roughened by 

 weathering in the sDecimen under examination. 



