BATOCRINID^. 369 



Batocrinus irregularis Cassedat. 

 Plate XXVII. Figs. 4a, b, and c. 



1854. Cassebayj Deutsche Geol. Gesellsoh., Band TI., p. 240, Plate 2, Kgs. 2a, i, e. 



1867. Meek audWoKTHEu; Geol. Rep. Illinois, Vol. V., p. 367. 



1881. W. and Sp. ; Revision Palaiocr., Part II., p. 166. 



1892. S. A. MiLLEK ; Adv. Sheets 18th Rep. Geol. SurT. Indiana, p. 26, Plate 4, Figs. 6-9. 



Resembling the preceding species, but readily distinguished by its smaller 

 size, more elongate form, much greater depth of dorsal cup, by having a less 

 number- of arms, and the absence of spiniferous j)lates in the tegmen. Sur- 

 face of plates smooth or slightly wrinkled, the radial ones transversely 

 ridged ; suture lines distinct. 



Basal cup projecting, circular in outline, deeply excavated for the attach- 

 ment of the column. Radials short, considerably wider than the costals. 

 Costals small, quadrangular, twice as wide as long ; succeeded in four of the 

 rays by 2 X 2 distichals, which resemble the costals in form and size, and 

 support 2X2X2 fixed palmars. In the anterior ray there are two rows of 

 three successive distichals followed by the free arms. Arms eighteen, the 

 ambulacral openings directed horizontally. Interbrachial plates three ; the 

 first larger, supporting two plates in the second range. The anal piece is 

 succeeded by three plates, and one above. Tegmen high-conical, higher 

 than the dorsal cup; composed of comparatively few, large, tumid plates. 

 Anal tube stout, almost central; constructed of strongly nodose pieces. 

 Arms and column unknown. 



Horizon and Locality. — Same as last. 



Batocrinus subsecLualis (McChesnbt). 

 Plate XXVIII. Figs. 7a, h ; 8a, b, and 9. 



I860. ActinocrUus subaqualis — McChesnet, Desor. Pal. Foss., p. 17. 



1870. Actimcrims submqualis — McGhesnet; Chicago Acad. Nat. Sci., p. 13, Plate 5, Fig. 7. 

 1873. Batocrinus subtequalis — Meek and Worthen; Geol. Rep. Illinois, Vol. V., p. 367. 

 1881. Batocrinus subieqvalis — "W. and Sp. ; (Syn. of Batocrinus discoideus), Revision Palasocr., Part II., 

 p. 166. 

 Syn. Actinoerinus discoideus —'S.kiA.; 1858, Geol. Rep. Iowa, Vol. I., Part II., p. 594. 

 Syn. Batocrinus discoideus — Meek and Worthen; Geol, Rep. Illinois, Vol. V., p. 367, and Whit- 

 field ; Mem. Amer. Mus. Nat. Hist., 1893 ; Vol. I., p. 14, Plate 1, Figs. 19, 20. 

 Syn. Actinoerinus formostts — Hall, 1860; Suppl. Geol. Rep. Iowa, p. 30. 

 Syn. Batocrinus formosus — Meek and Worthen; 1873 ; Geol. Rep. Illinois, Vol. V., p. 367. 

 Syn, Batocrinus tequabilis — ^. A. Miller, 1894 ; Geol. Surv. Missouri, Bull. 3, p. 25, Plate 5, Figs, 

 13, 14, 15. 



47 



