BATOCEINID^. 437 



Basals short, projecting ; forming a hexagon ; excavated at the bottom. 

 Radials large, wider than long, rapidly spreading to two thirds their height, 

 their upper faces deeply excavated in a somewhat similar manner as the 

 fiicets of the radials in the Platycrinidse. First costals more than twice as 

 wide as long, subquadrangular ; lower and lateral faces convex ; the upper 

 ones straight. Second costals longer than the first, their sloping upper faces 

 forming an obtuse angle. . Distichals 2x2; the first one largest ; the sec- 

 ond, although an axillary, scarcely angular above. Palmars 2X2, short, 

 smaller than those succeeding them ; the outer ones of the second row 

 separated by interbrachial plates. Arm openings directed upwards, arranged 

 in pairs. Interbrachials three, of which the lower one extends almost to the 

 level of the arm bases ; it is extremely large, broad at the bottom, taper- 

 ing upwards. There are three plates in the second row, of which the 

 middle one rests upon the truncated upper face of the first, the two others 

 against the adjoining sloping faces. Anal plate considerably narrower than 

 the radials ; followed by 3, 2, and 1 plate. Ventral disk pyramiidal, sup- 

 porting a nearly central anal tube of moderate width. Plates convex, nodose ; 

 the orals very large, especially the posterior one. Structure of arms and 

 column unknown. 



Horizon and Locality. — Keokuk group; White's creek Springs, near 

 Nashville, Tenn. 



Type in the collection of Wachsmuth and Springer. 



Lobocrinus pyriformis (Shum.). 

 Plate XXXI. Figs. Sa^e. 



1S55. Actinocrinus pyriformis — SnTJiiAJiD ; Geol. Rep. Missouri by SwaEow, Part II., p. 192, Plate A, 



Pigs. 6a, i. 

 1865. Aciinocri?ms (JJperocriims) pyriformis — Meek and Worthen; Proceed. Acad. Nat. Sci. Pliila., 



p. 15.3 ; also Geol. Rep. Illinois, Vol. II., p. 150. 

 1873. Btttocrinus pyriformis — Meek and Wokthen; Geol. Rep. Illinois, Vol. V., p. 375, Plate 5, Pig. 5. 

 1881. Batocrinus pyriformis — W. and Sp. ; Revision Palaiocr., Part II., p. 167. 

 1889. Batocrinus pyriformis — Neumatr ; Die Stamnie d. Thierreiches, p. 46i, Fig. 134. 



Sjn. Actinocrinus pyriformis, var. rmlis — Meek and Wokthen ; 1860, Proceed. Acad. Nat. Sci. 



Phila., p. 131. 

 Sju. Actinocrinus (JJperocriims) pistilliformis — M. and W. ; Geol. Rep. of Illinois, Vol. II., p.l51, 



PL 14, Pig. S. 

 Syn. Batocrinus pistilliformis — M. and W.; ibid. Vol. V., p. 367. 



A rather large and variable species. Calyx higher than wide, more or 

 less pyriform, and but slightly depressed between the rays. Dorsal cup nar- 

 row, and almost cylindrical to the top of the radials — sometimes to the top 



