BATOCRINID2. 43] 
Remarks. — Meek and Worthen in 1865 (Proceed. Acad. Nat. Sci. Phila., 
p. 164), intimated that probably this species was generically, and perhaps 
specifically, identical with Alloprosallocrinus conicus; but neither the one nor 
the other is the case. That species has twelve arms, and these obviously 
were given off from the calyx in a very similar manner as the arms of 
Agaricocrinus ; while those of Dizygocrinus euconus, to judge from the size of 
the arm facets, were quite slender at their bases. 
Dizygocrinus euconus var. abscissus (Rowrzy and Harz). 
Plate XLVI. Fig. 9. 
1891. Batocrinus abscissus — RowLEy and Haru; Kansas City Scient., p. 115, Plate 3, Fig. 6. 
Syn. Batocrinus venustus 8. A. Mruimr; Ady. Sheets 17th Rep. Geol. Surv, Indiana, 1891, p. 67, 
Plate 11, Figs. 11 and 12. 
This form agrees essentially with the preceding one. It is, however, 
somewhat larger, has twice the number of arms, and the third palmars are 
incorporated into the calyx, while they are free in the other. There are 
thirty-two arms in the normal state, which are rather short and slender, 
and decrease in size upwards. The arm plates are short. Ventral disk 
decidedly conical, the plates slightly convex. 
Horizon and Locality.— Upper part of the Keokuk group, and lower part 
of the Warsaw limestone; Taylor Co., Ky., and at Boonville and Curry- 
ville, Mo. 
Type in the collection of Mr. R. R. Rowley, Fort Smith, Ark. 
Ltemark:s. —Rowley and Hare’s name Butocrinus abscissus was published a 
month in advance of Miller’s B. venustus. 
Dizygocrinus rotundus (Yayo. and Suvum.). 
Plate X XIX. Figs. 8a-g, and 4. 
1848, Actinocrinites — Christy’s letters on Geology; Plate 1, Figs. 8 and 4. 
1855. Actinocrinus rotundus —YanpELL and Suum.; Geol. Rep. Missouri by Swallow, Part IL, p. 191, 
Plate 4, Figs. 2a, 0. 
1873. Batocrinus rotundus —Menx and Wortuen; Geol. Rep. Illinois, Vol. V., p. 367. 
1881. Butocrinus rotundus —W. and Sr.; Revision Paleocr., Part II., p. 168. 
Syn. dActinocrinus oblatus Hatt; 1860, Suppl. Geol. Rep. Iowa, p. 38. 
Syn. Batocrinus oblatus —Wurtrinnp; Mem. Amer. Mus. Nat. Hist., 1893, Vol. T., p- 12, Plate 1, 
Figs. 21, 22. 
Form of calyx varying from ovate to depressed globose. Plates flat, the 
surface perfectly smooth, and the suture lines indistinct. 
Basals small, forming a saucer-shaped disk, hexagonal in outline, slightly 
excavated at the bottom. First costals twice their width, much narrower 
