456 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
arm bases. First anal plate longer than the radials, the median portions 
marked by a transverse ridge, followed by a longitudinal row of four 
additional anals, and these by a moderate number of irregular pieces which 
surround the anus. The four latter anals sustain at their sides a row of 
elongate plates, which decrease in size upwards. Anal area elevated, the 
median line forming a rounded ridge, which passes up to the posterior 
oral. Ventral disk inflated, as high as the dorsal cup, pentagonal in out- 
line. The spines are long, sometimes reaching a length of 5 cm. or more; 
the other plates of the disk flat, or moderately convex. The posterior oral, 
which is represented by the central spine, is as large at its base as the other 
four orals together; the latter are pushed anteriorly. The first radial dome 
plates, which are represented by the five lateral spines are surrounded by 
five rather large plates, and these are followed downward by two secondary 
radial pieces and a large interambulacral. Anus on a level with the lateral 
spines, the opening directed laterally. 
Horizon and Locality.— Upper part of the Keokuk group; Keokuk, 
Iowa, and Warsaw, Hamilton, and Nauvoo, Ills., also found at White’s 
creek near Nashville, Tenn., and at several localities in Indiana and 
Kentucky. 2 
Types in the Mineralogical Museum at Breslau, Germany. 
Remarks. — Since the above description was written, we have examined 
a fine specimen in the collection of L. A. Cox of Keokuk, in which the arms 
are preserved to near their full length, and 13 cm. of the stem. The arms 
are paired and of moderate size; they are composed of rather long joints, 
which are not spine-bearing so far as observed. The column is rather heavy 
at the top, but tapers gradually from 8 mm. to 4 at the lower end. The 
first internodal joint exposed to view occurs between the eighth and ninth 
joints, but they imcrease rapidly in number, and soon attain the form and 
size of the nodal joints, which gradually become cylindrical and narrower. 
Dorycrinus Gouldi (Hatr). 
Plate XLII. Figs. 2, 8, and Plate XLIV. Figs. 4, 5. 
1858. <Actinocrinus Gouldi — Hawi; Geol. Rep. Iowa, Vol. I., Part IL., p. 613, Plate 15, Figs. 6a, 8, c. 
1873. Dorycrinus Gouldi — Mrnx and WortnEn; Geol. Rep. Illinois, Vol. V., p. 380. 
1881. Dorycrinus Gouldi—W. and Sv.; Revision Paleocr., Part II., p. 179 (Proceed. Acad. Nat. Sci. 
Phila,, p: 353). 
Calyx about as high as wide, crowned by six extravagantly developed 
spines. Dorsal cup obpyramidal, obscurely pentangular to the top of the 
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