FOSSILS OF THE BUKLIXGTON (JKOUP. 383 



Locality and position Lower bed of Burlington Limestone, Burling- 

 ton, Iowa. Lower Carboniferous. Xo. 150 of Mr. WACHSMUTH'S col- 

 lection. 



DORYCRENTJS UNicouxis, O. and S., sp. 



PI. 6, Fig. 2. 



Actinocriniis unicomis, OWES and SHUHARD, 1850. Jour. Acad. Xat. Sci., Phila., Vol. 2, new series, 

 p. 67. Geol, Rep. Iowa. Wis. and Minn., p. 593. PI. 5 A, fig. 12, 



(Burlington Limestone, Burlington, Iowa. Mr. WACHSMUTH'S collection.) 



DORYCRLSTJS RCEMERI, M. and W. 



PL 10, Fig. 3. 

 Doryerinus Rcemeri, MEEK and WOBTHEN. Proceed. Acad. Xat. Sci., Phila., 1868, p. 346. 



BODY somewhat urn-shaped, being obconical below the 

 arms to the truncated base, and moderately prominent 

 above, the vault forming rather more than one-third of 

 the entire hight ; greatest breadth at the ami-bases. Base 

 truncated and somewhat concave below, about twice as 

 wide as high, slightly expanded and a little angular below, 

 with broad, rather shallow notches at the sutures. First 

 radial pieces about twice and a half as wide as high, two 

 heptagonal and three hexagonal, each one swelling out so 

 as to form a moderately prominent, rather obtuse, trans- 

 versely elongated node. Second radials one-third to nearly 

 one-half as long as the first, quadrangular, a little wider 

 than long, and more or less tumid. Third radials rather 

 larger than the second, wider than long, pentagonal, hex- 

 agonal and heptagonal ; each one supporting on each of its 

 superior sloping sides a pentagonal secondary radial, of 

 rather smaller size, each of which in the posterior rays sup- 

 ports in its turn, on each side above, one, or sometimes 

 two brachial pieces, making four arm openings to each of 

 these rays. This seems to be the case also in the right 

 lateral ray, while one of the secondary radials, in the speci- 

 men studied, appears to be merely truncated, so as to sup- 

 port (perhaps abnormally) only one brachial piece, thus 



