Mo. 1850. KKOHSTOXl^ CRl'MOtD FAUNA— SPRINGER. 199 



I have not undertaken to give names to these forms, preferring to 

 wait until proper illustrations can be prepared and closer comparison 

 made with described species; but I have little doubt that most of 

 them are new. 



BARYCRINUS Meek and Worthen. 



This was also a prominent genus in these beds. It ranges from the 

 Lower Burlington to the Warsaw, but has not been recognized in the 

 European Lower Carboniferous. It is a more specialized type than 

 CyathocHnus m its arm structure, and the course of its development 

 through the crinoidal formation was more in accordance with the 

 general rule. The species in the Lower Burlington are relatively 

 small, with delicate ornamentation, while those in the Keokuk are 

 mostly large and coarse, one of them being the largest Inadunate 

 crinoid in the American rocks. Some types persisted through with 

 little change recognizable in the fossils, and some forms from the 

 typical Burlington and Keokuk can scarcely be distinguished from 

 one another except by the color and matrix. This is especially so in 

 forms with a more or less stellate base. Seven species have been 

 described from the two Burlington beds and the Choteau; 21 from 

 the Keokuk, of which at least half are synonyms; 2 from the War- 

 saw; and 1 said to be from the St. Louis of Jersey County, Illinois, 

 wliich is doubtless from the Warsaw also. About six species are 

 represented among the isolated plates from the Knobs, some of them 

 by complete calices at Whites Creek, along with some additional 

 species. 



1. Medium to small size, low, with broad base. IBB very small 

 and flat; BB about as large as RR; facets very large, rather deep 

 and elliptic, more resembling those of CyatJiocrinus than usual in this 

 genus. The dorsal surface is traversed by remarkably elevated, 

 sharp, keel-like ridges, connecting the facets laterally and running 

 from them without a break to the center of the basals, thence less 

 conspicuously brandling to the infrabasals; these divide the calyx 

 into ten deep and wide pits, somewhat resembling a colony of Litlio- 

 strotion corals. Isolated radials of this form can be at once recog- 

 nized from all others by the four large, sharp ridges projecting like 

 cogs from the rim of the facet, which occupies almost the entire radial. 

 Three good calices and a number of plates were found at Whites 

 Creek showing these characters beautifully. Now this is the very 

 kind of sculpturing, only more pronounced, that is found in a remark- 

 ably beautiful specimen from the Lower Burlington that has been for 

 many years in my collection labeled " B. rhomhiferus Owen and Shu- 

 mard." It has the arms perfectly preserved, and the same kind of 

 high, knife-like wrinkles extend for their entire length; but on each 

 axillary the wrinkle is produced into a short spine, as is also the case 



