FOSSILS OF THE BUKL1NGTON GROUP. 



five pieces in a direct range, extending out laterally, and 

 curving around toward the ventral side; of these pieces the 

 first is very short, and does not support an arm, while each 

 of the other bears an erect arm above. Each of these late- 

 ral arms, a.s far as can be seen, gives oif a small division 

 on the dorsal side of the third piece above the base, while 

 the main division of each bifurcation again on the fourth 

 piece above, the bifurcating pieces being a little tumid. 

 All the arms have a deep anibulacral furrow within. 



Pieces of the ventral side unknown. 



Length of base, 0.10 inch; length of body, exclusive of 

 base, 0.35 inch; breadth do., 0.27 inch; length of arms, 1 

 inch. 



This species is related to C. dactyl us. Hall, but differs in having its 

 dorsal arm simple, instead of bifurcating, and its lateral arms bifurca- 

 ting first on the third instead of the fourth piece. From C. ventricosus, 

 Hall, it also differs in having the dorsal arm simple, instead of bifur- 

 cating, while its upper dorsal piece is distinctly shorter in proportion 

 to breadth than in that species. 



If farther comparisons should show these forms to be generically dis- 

 tinct from Calceocrinnx, and Cheirocrinus is found to be tenable, this 

 would have to be called Cheinn-rinH* Wacltsmutln. 



The specific name is given in honor of Mr. CHARLES WACHSMUTH, 

 of Burlington, Iowa, to whom we are indebted for the use of the speci- 

 mens from which the description was made out. 



Locality and 2^osition Upper Burlington beds of Lower Carbonifer- 

 ous, at Burlington, Iowa. Mr. WACIISMUTH'S collection. 



GEXUS EBISOOETNTrS, M. and W., 1865. 



Geol. Surv. of Eliiiois, Vol. II. p. 315. 



This genus was originally proposed by us for the reception of two 

 very similar forms, one of which, from the upper part of the Coal 

 Measures of Illinois, we called E. typus, and the other, from the same 

 horizon in Nebraska, we called E. ycbrasccnsfe. The specimens then 

 known consisted only of the body up to the summit of the first 

 radials. This part of these forms is subhemispherical in outline, being 

 rounded below, and evenly truncated above, with five minute or very 



