362 I'nnwdiiif/s of ilic Ohio State . IcddrniY of Science. 



ISOo. Cyatliocriiiiis Ma.vvillciisis. W hitfuld, Genl. Surv. Ohiu, Vol. VII, 

 p. 4(ir), pi. !), tigs. o-S. 

 Maxville limestone: Newton \ilk', Ohio. 



Description. — "i^ody of rather .small .size. C alv.\ deep 

 cyathiform, being nearly hemispherical in one e.\am])Ie, and 

 somewhat broad abconical in another, and composed of smooth 

 plates, which have only the general convexity of the bodv, o-r 

 very slightly tuberose. l>asal plates minute t(j moderate size, 

 higher than wide. Stibradials large; height and width nearly 

 eqnal ; two of them heptagonal and the others hexagonal, the 

 lower sides barel}' diverging from a straight line. First radials 

 wider than high, and al)otit two-tliirds as high as tlic subradials. 



Fig. M. — Cyatlwcriiitts ma.vvillensis. 



a. — View of the anal side of a specimen showing the long second 

 radials. enlarged to two diameters. 



I) and c. — Anterior and posterior views of another specimen show- 

 ing the large outer arm. 



d. — .Anterior view of a third specimen. (.After Whitfield.) 



Anals visible, three in nmnber ; the tirst elongate pentagonal, 

 nearly twice as high as wide, and sitttated a little obliqttely on 

 the right side of the area ; the other two are small and ])entagonal. 

 Second radials, or first arm ])lates, smaller than the first radials 

 and narrowing ujnvard, wedge-formed above, and each snpport- 

 ing two arms. On the posterio-lateral rays they are long and 

 cylindrical, with the arms slender. On the anterior ray, it is 

 short and supports two slender arms ; while on the anterio-lateral 

 rayr> they stijiport a slender arm; similar to those of the other 



