FOSSILS OF THK KKnKTK GROUP. 487 



BARTCKIXUS PEXTAGOTS. TTorthen. 3Is. 



PL 15, Fig. 3. 



BODY of medium size, broadly subglobose, and pentag- 

 onal in outline when seen from below, gradually swelling 

 from the base to the top of the first radials. Base pen- 

 tagonal, depressed in the center, composed of nearly equal 

 sized, thick, pentagonal plates, strongly depressed at the 

 angles, giving a stellate outline to this part of the body. 

 S ubra dials large, width and highth about equal, the one on 

 the anal side rather the largest, and septagonal, the others 

 hexagonal, all deeply impressed at the angles, and gradually 

 swelling to a point a little above the center of ea^h plate. 

 The depression at the sutures of the basal plates extends 

 nearly to the center of the subradials, forming a stellate 

 depression when viewed from below, the points of which 

 terminate near the center of the subradials, as may be 

 seen in fig. 3 a. Radial plates unequal in size, wider than 

 high, and like the subradials strongly depressed at the 

 angles, and deeply excavated above for the reception of the 

 second radials. Anal plate quadrangular, about half the 

 si/e of the first radials, and extending a little above the 

 summits of those on either side. Anns and column 

 unknown. 



1'intition and locality Keokuk Limestone, Otter creek, Jersey county, 

 Illinois. 



BARYCKINUS SUBTUMIDUS, M. and TV. 



PL 13, Fig. 3. 

 Baryerinug gubtumidui. MEEK and WOBTHBX. Proceed. Acad. Nat. Sci., Phila.. Au., p. 151. 



BODY below the summit of the radial pieces cup-shaped, 

 robust, rather^deep, somewhat rounded below, with nearly 

 vertical sides above the subradial pieces. Basal pieces well 

 developed, pentagonal, convex, and about as wide as long. 

 Subradials four or five times as large as the basal pieces. 



