FOSSILS OF THE BURLIXGTOX GROUP. 377 



described it. because we have at hand one of Mr. WACHSMUTH'S speci- 

 mens showing the arms and ventral tube, all complete. Indeed it is the 

 only specimen oi a Crinoid, of the family Actinocnnidte, we have ever 

 seen, with the extreme end of this tube unbroken. It is also interesting^ 

 as it shows how impossible it would have been for the animal to have 

 conveyed food to the small opening in the end of this tube, by the direct 

 agency of the arms, as some have supposed, since its arms are scarcely 

 half as long as this tube. 



Locality and position Upper Burlington l>eds of the Lower Car- 

 boniferous series. The beautiful specimen we have figured, belongs to 

 Mr. CHARLES WA< HSAIUTH, of Burlington, Iowa, who found it at that 

 place, where the species is not uncommon. It also occurs at several 

 localities in Illinois ; and Dr. SHTTMARD'S typical specimens were found 

 in Marion county, Missouri, at the same horizon as the Upper beds at 

 Burlington. 



BATOCKIXUS (ERETMOCRIXUS?) XEGLECTUS, M. and W. 



PL 5. Fig. 3. 



Batocrinu* ( Eretmoerimt* ) neglectus, MEEK and WORTHEX. Proceed. Acad. Xat Sci., Phila., 

 1868, p. 355. 



BODY small, inversely campanulate below the amis, and 

 rather rentricose above ; the sides expanding gradually from 

 the base to the third radials, and thence curving out rapidly 

 to the outer edges of the brachial pieces, which are slightly 

 grouped, but nearly or quite in contact all around. Base 

 about three times as wide as high, truncated and concave 

 below, but not thickened or expanded. First radials com- 

 paratively large, generally wider than long, and, as usual, 

 two heptagoual and three hexagonal : all like the other 

 body plates, convex, but not properly tumid. Second ra- 

 dials much smaller than the first, quadrangular and nearly 

 twice as wide as long. Third radials as large as the second, 

 or slightly larger, wider than long, and all normally pen- 

 tagonal; each supporting on each of its superior sloping sides 

 a secondary radial, which in its turn bears on each side above 

 two brachial pieces in direct succession, thus making four 

 arm openings to each ray, or twenty to the entire series. 



49 



