Paleontology of the Cincinnati Group. 67 



tion near the center. Arms nearly circular, extending out- 

 ward or upward, terminating in a compressed extremity, and 

 when perfect closed at the distal ends. vSpicules cruciform. 

 (Beecher, Ibid, pp. 19-20.) 



Localities. — Franklin County, Kentucky; (?) Wilmington, 

 Ohio. 



Remarks. — This species was first described by Dr. I). I). 

 Owen, in Geol. vSur. of Kentucky, vol. 2, 1857, p. iii, as 

 Scyphia dioitata. Only one or two specimens in any way 

 perfect have ever been found. One of these is in the State 

 Museum at Frankfort. Excellent illustrations of the species 

 are given in Nettelroth's Kentucky Fossil Shells, and in 

 Beecher's Memoir, above (quoted. Mr. E. C. Went, of Frank- 

 fort, was fortunate enough to find the fossil /;/ situ on Cedar 

 Run, about 2)2 miles south of Frankfort, and he has found a 

 large number of fragments, but no perfect specimens. Its 

 horizon is given by Nettelroth as the lower beds of the Cin- 

 cinnati group, though it has generally been regarded as a 

 Trenton form. Dr. Beecher was the first to describe and 

 figure the spicules, some of which are shown in a figure given 

 above. B. lyoni Marsh, B. roemcrana Marsh and B. hoveyi 

 Marsh are synonyms. 



A second species of this genus was described by Mr. U. P. 

 James under the name of B. tiibcrculata. (The Paleontologist, 

 No. 4, Jul}', 1879, p. 25). The description is essentially as fol- 

 lows : "Fossil consisting of a sub-circular body with nine 

 arms projecting horizontally somewhat like the spokes of a 

 wagon wheel, and when placed upon its edge has some resem- 

 blance to a clumsily constructed, massive wagon-wheel, desti- 

 tute of tire and felloes. The body is between five and six 

 inches in diameter, one arm broken off close to the body, the 

 others left from one to two inches in length, all having been 

 broken away to such lengths; but the broken, detached end 

 of one was found, which fits closel}' to the place of fracture, 

 and makes the length of that arm 3)^ inches, where it 

 bifurcates ; length of branches of that arm unknown, both 

 being broken away just beyond the bifurcation. The speci- 

 men is about two inches thick through the thickest part of 

 the body, and the arms [are] from ij<( to i>^ inches in diam- 

 eter at their junction, tapering ver}- little, if an}-, to the frac- 

 tured ends, except where weathered ; in fact, the one showing 



