1881.] NATURAL SCIENCES OF PHILADELPHIA. 3S9 



joints, without increasing in heiglit, gives off, in place of the first 

 pinnule in the other species, a second arm, whicli passes into the 

 same arm opening as its companion. Pinnules composed of 

 slender joints, closely attached laterall}^ their sides flattened, 

 their depth greater than tlieir width, with a deep ventral furrow 

 covered bj- small plates. 



Column round, composed of rather large joints with more or 

 less angular edges ; perforation of moderate size, pentangular. 



Geological Position, etc. — Batocrinus is strictly a Subcarbon- 

 iferous form. It is exclusively an American genus, and embraces 

 the last survivors of the Actinocrinidse. 



We place here the following species : — 



*1?60. Batocrinus aequibrachiatns McChesney. (Actinocr. aequibrachiatus) 



New Pal. Foss., p. 25: al?o Chicago Acad. Sci , 1867, p. 18; Meek and 



Wortbcn, 1873, Batoor. aequibrachiatus, Geol. Rep. 111., v, p. 368. Upper 



Burlington limest. Burlington, Iowa. 

 Syn. Actinocr. asteriscas Meek and Worthen, 1860. Proc. Acad. Nat. Sci. 



Phila., p. 385 ; also 1866, Geol. Rep. 111., ii, p. 207, PI. 15, figs. 8 a, b, c ; 



also 1873, Batocr. asteriscus. Ibid., v, p. 368. 

 .S'yn. .Actinocr. aequibraobiatus var. alatus Hall. Desc. New Spec. Crin.. 



1861; also Bost. Journ. Nat. Hist., p. 263, Pbotogr. PI. 3, figs. 21-23. 

 1858. Batocr. aequalis Hall. (Actinocr. aeqnalis) Geol. Rep. Iowa, i, pt. ii, p. 



592, PI. 11, figs. 4 a, b: Meek and Worthen, 1873, Batocr. aequalis, Geol. 



Rep. 111., V, p. 367. Lower Burlington limest. Burlington, Iowa. 

 Syn. Actinocr. doris Hall, 1861. Desc. New Sp. Crin,, p. 15; Meek and 



Worthen, 1873, Batocr. doris, Geol. Rep. 111., v, p. 367. 

 *1860. Batocr. andrewsianns McChesney. (Actinocr. andrewsianus) New Pal. 



Foss., p. 27: also 1867, Chicago Acad. Nat. Sci., p. 20, PI. 6, fig. 5. Upper 



Burlington limest. Burlington, Iowa. 

 1S58. Batocr. biturbinatus Hall. (Actinocr. bitu^binatus) Geol. Rep. Iowa, i. 



pt. ii, p. 616, PI. 16, figs. 5, 6, a, b, c; Meek and Worthen, Geol. Rep. Ill , v, 



p. 367. Keokuk limest. Illinois and Iowa. 

 1860. Batocr. calycnlus Hall. (Actinocr. calyculus) Supp. Geol. Rep. Iowa, p. 



55, PI. 1, figs. 12 a, h, c; Meek and Wor'b., 1873, Batocr. calyculus, Geol. 



Rep. 111., V, p. 367. Warsaw limest. Spurgeon Hills, Ind. 

 Syn. Batocr. calyculus var. hardinensis Meek and Worth., 1866. Proe. 



Acad. Nat. Sci. Phila., p. 253. 

 We doubt that the type specimen came from the St. Louis limes>t., it would be 



the only example of an Actinocrinoid being found beyond the Warsaw 



limest. 

 «1860. Batocr. Caroli Hall. (Actinocr. Caroli) Supp. Gol. Rep; Iowa, p. 54, PI. 1^ 



fig. 11. Warsaw limest. Warsaw, 111. 

 1869. Batocr. Cassedayanus Meek and AVorth. Proc. Acad.: Nat. Sci. Phila , p. 



353; Geol. Rep. 111., v, p. 370, PL 5, fig. 1. Lower Burlington limt-st. Bur- 

 lington, Iowa. 



