BATOCRrNTD^. 381 



transverse pieces with serrated lateral margins ; the tijjs infolding'. The 

 anal plate is a little longer than the radials, and followed by three and two 

 plates. The regular sides have two or three interbrachials, of which the first 

 is large. Ventral disk low hemispherical, the plates more convex than those 

 of the dorsal cup, and almo.st of uniform size. Anal tube extremely long, 

 attaining in one of our specimens a length of five inches, which is nearly 

 four inches beyond the tips of the arms ; it is stout at the base, but very 

 thin at the upper end. Column of less than medium size; the nodal joints 

 a little wider than the others; near the calyx they are short and rounded at 

 the edges, but they gradually grow longer and cylindrical ; at four inches 

 from the calyx all the joints are of equal size and of nearly the same height. 



Horizon and Locality. — Same as last. 



TyiKS in the (Worthen) Illinois State collection. 



RemarJcs. — We have found it utterly impossible to separate Hall's 

 " Actinocrinus" iMpilMus and " Actinocriims" inornatiis from this species, 

 although we took the utmost pains to do so, and had the types for com- 

 parison. We have before us over one hundred specimens, which agree in 

 all essential points, but diifer more or less in the convexity of the plates and 

 the form of the calyx. The plates in some of them are entirely smooth, in 

 others distinctly convex, and while in some the calyx is much wider than 

 high, width and height are almost alike in others. Miller's B. cornparUis is 

 identical with the typical form. 



Batocrinus grandis (Lton). 

 Plate XXVIL Figs, la, h, and Sa, h. 



1859. Actinocrinus grandis — Lyon; Amer. Journ. Sci., Vol. XXVIII., p. 240. 



1885. Batocrinus grandis — W. and Sp. ; Kevision Palteocr. Part III., p. 113. 



Syn. Actinocrinus Wachsmuthi — White, 1880; 12tli Ann. Rep. Terr, by Hayden (Autlior's Edit., 

 p. 162), Plate 40, Figs. 1«, h, and Geol. Kep. Indiana for 1879-80, p. 142, Plate 7, Fig. 6 (not 

 Actinocrinus Wachsnnithi White, \%^'i = Aciinocrijius scitulus ; nor Batocrinus Waclisniutlii, 

 Revision Palaocr., Part II., p. 16S). 



Larger than the preceding species, and proportionally higher. Dorsal 

 cup gradually expanding from the top of the basals to the top of the dis- 

 tichals, thence abruptly to the bases of the free arms. Plates convex. 

 Radials and distichals covered by transverse nodes, the interbrachial plates 

 by round ones, which grow shorter as they approach the arm regions. 



Base broad, decidedly lobed ; the plates thickened at the lower end, and 

 slightly projecting laterally ; the interbasal sutures deeply grooved. Radials 



