370 PALAEONTOLOGY OF ILLINOIS. 



with a subcentral proboscis, which is usually about as 

 broad below as the base. 



Hight of the largest specimen to top of vault, about 0.70 

 inch ; greatest breadth (which is at the arm-bases), 0.80 

 inch; breadth of base, 0.35 inch. 



This species seems to be related to our B. pistill-us, but may be easily 

 distinguished by its much more depressed form, particularly below the 

 arm openings, caused by its much shorter basals, and first and second 

 radial pieces. Its base also differs, in being much more excavated, and 

 not near so expanded below, while its brachial pieces are proportionally 

 stouter and more crowded. Although the whole number of arm openings 

 is the same in these two forms, this arrangement is different, the formula 

 of B. mstillus being 5-5 =24, and that under consideration *- =24. 



-* ** 5 5 ' o 6 



Locality and position Lower division of Burlington beds of Lower 

 Carboniferous, at Burlington, Iowa. No. 14 of Mr. WACHSMUTH'S col- 

 lection. 



PL 10, Fig. 5. 

 Actinocrinus remibrachiatus, HALL, 1861. Descr. new Crinoidea, preliminary note, p. 11. 



Burlington limestone, Burlington, Iowa. 



BATOCKINUS CASSEDAYANUS, M. and W. 



PI. 5, Fig 1. 

 Batocrinus Cassedayanus, MEEK and WORTHEN. Proceed. Acad. Nat. Sci., Phila., 1868, p. 353. 



BODY rather broad, subturbinate below, or with the vault 

 subglobose, being a little larger below than above the arm- 

 bases. Base short, or about four times as wide as high, a 

 little thickened, and slightly overhanging the end of the 

 column, and more or less notched at the sutures, so as 

 to present a somewhat trilobate appearance. First radial 

 pieces of moderate size, and, like all of the other body 

 plates, rather distinctly tumid, wider than long, two hex- 

 agonal and three heptagonal. Second radials about half 

 as large as the first, nearly twice as wide as high, normally 

 quadrangular, but some of them occasionally with one or 



