BATOCRINIDZ. 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 
facets of the radials in the Platycrinide. 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 2 X 2, 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 adjoiing sloping faces. Anal plate considerably narrower than 
the radials; followed by 38, 2, and 1 plate. Ventral disk pyramidal, sup- 
porting a nearly central anal tube of moderate width. Plates convex, nodose ; 
ee a ee 
the orals very large, especially the posterior one. Structure of arms and 
column unknown. 
Horizon and Locahity.— Keokuk group; White’s creek Springs, near 
Nashville, Tenn. | _ 
- Type in the collection of Wachsmuth and Springer. ¥ 
Lobocrinus pyriformis (Sxvu™.). 
Plate XX XI. Figs. 8a-e. 
1855. Actinocrinus pyriformis —SHUMARD ; Geol. Rep. Missouri by Swallow, Part IL, p. 192, Plate A, 
Figs. 6a, 0. 
1865. <Actinocrinus (Uperocrinus) ' pyriformis — MuEK and Wortrurn; Proceed. Acad. Nat. Sci. le 
p. 153; also Geol. Rep. Illinois, Vol. IT., p. 150. 
1873. Batocrinus pyriformis — Munk and WortusEn; Geol. Rep. Illinois, Vol. V., p. 375, Plate 5, Fig. 5. 
1881. Batocrinus pyriformis — W. and Sp. ; Merson Paleocr., Part IT., p. 167. 
1889. Batocrinus pyriformis — Nuumayr; Die Stamme d. Thierreiches, p. 464, Fig. 134. 
Syn. Actinocrinus pyriformis, var. rudis— Munk and WortHen; 1860, Proceed. Acad. Nat. Sci. 
Phila., p. 131. 
Syn. eae inus (Uperocrinus) pistilliformis —M. and W.; Geol. Rep. of Illinois, Vol. IT., p.151, 
Pl. 14, Fig. 8 
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 
