NEW SPECIES OF CRINOIDS, CEPHALOPODS AND 

 OTHER PALEOZOIC FOSSILS. 



BY S. A. MILLER AND WM. F. E. GURLEY. 



SUBKINGDOM ECHINODERMATA, 



CLASS CRINOIDEA. 

 ORDER PAL.EOCRINOIDEA. 

 FAMILY ACT IN( )CR I NIDiE. 



AGARICOCRINUS IOWENSIS, n. Sp. 



Plate 1, fig. 1, basal view; fig. 2, summit view; fig. 3, azygous view 

 of the same specimen. 



Species large, subpentagonal in outline, by reason of the extension 

 of the radial areas. Calyx very deeply concave, and vault corre- 

 spondingly convex, leaving a thin visceral cavity. Plates thick, con- 

 vex, and giving to the whole form a very rugged aspect. Of this 

 species we have three specimens, two of them are substantially alike, 

 though one has a more convex vault which is somewhat more evenly 

 rounded. 



Basals form a flat hexagonal disc somewhat larger than the diam- 

 eter of the column. First primary radials about as long as wide, 

 and gently curve from the basal disc so as to form a concave bot- 

 tom for the cavity of the calyx; three hexagonal, two heptagonal. 

 Second primary radials a little wider than long, quadrangular. 

 Third primary radials very little larger than the second and wholly 

 within the concavity of the calyx, three hexagonal, two pentagonal, 

 axillary, and support on the superior sloping sides the secondary 

 radials. First secondarjr radials large, tumid or highly convex, the 

 inferior part is within the cavity of the calyx and the superior 



