378 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



BatOCrinus pOCUlum Miller and Gublet. 

 Plate XXX. Fig. 6. 



1890. Descr. New Spec, and Geu. of Ecliinod., p. 34, Plate 6, Figs. 6, 7. 



Somewhat larger than the preceding species. Dorsal cup bulging out- 

 ward, spreading but little above the costals ; the base not projecting ; plates 

 nearly flat; suture lines obscurely grooved. 



Basals short, forming a rounded shallow cup, of which the upper margin 

 is deejjly excavated for the reception of the radials. Radials once and a 

 half as wide as long, the suture lines toward the costals concave. Costals 

 large for the genus ; the first generally larger than the second. Distichals 

 and palmars two, as large as the costals. Arm openings at right angles to 

 the axis of the calyx. Arms twenty, arranged at equal distances ; short, 

 incurving, the tips slightly flattened. Interbrachials three to four, those of 

 the second row comparatively large. Anal plate followed by three or four 

 plates, and these by three others. Palmars in lateral contact apparently at 

 all sides. Ventral disk shorter than the dorsal cup, depressed convex ; com- 

 posed of tumid plates. Anal tube long and heavy. Of the column only the 

 upper part is known, which is similar to that in the preceding species. 



Horizon and Locality. — Same as last. 



Type in the collection of W. L. E. Gurley. 



Remarks. — This form is closely allied to our Batocrinus Machridd, from 

 which it diifers in the more globular form of the calyx, in the more flattened 

 and less spreading ventral disk, and in the greater length of the ventral tube. 



Batocrinus pistillus (M. and W.). 

 Plate XXXI. Figs. 4a, I. 



1865. Ac.tiiiocrintts pisliUus — Meek and Woethen ; Proceed. Acad. Nat. Sci. Pliila., p. 152. 



1863. Actinocrimis {Batocrinus) pistillus — Meek and Woethen; Geol. Eep. lllmois. Vol. III., p. 472, 



Plate 16, Figs. 4ff, b. 

 18S1. Batocrinus pistillus — W. and Sp. ; Revision Palfeoor., Part II., p. 167. 



Calyx subpyriform ; the sides of the dorsal cup rising nearly vertically 

 from the base to the summit of the radials, then expanding at fir.st gradually 

 to the distichals, and thence rapidly so as to place the upper palmars and 

 post-palmars in a horizontal position. Plates highly convex ; especially the 

 radials, the anal plate, and the first interbrachial pieces, which are trans- 

 versely nodose. 



