368 REPORT ON THE STATE CABINET. 



GENUS RHODOCRINUS, Miller. 



Rhodocrinus (Ltriocrinus) sculptilis, n. s. 



Body turbinate, rounded at the base, with, the arm bases prominent^ 

 Basal plates (7) concealed beneath the column attachment. Sub- 

 radials long, heptagonal. First radials wider than long, heptagonal. 

 Second radials much smaller than the first, somewhat quadrangular 

 in general form, but having the upper or lateral angles more or less 

 widely truncated. Third radials broad and short, much smaller 

 than the second, and supporting on each of the upper sloping sides 

 two or three suprai^adials ; giving two arms for each ray. The first 

 interradial plates are hexagonal or heptagonal, supporting two or three 

 smaller plates in the second range, with several smaller plates 

 above. The arms, as far as known, are two from each ray. The 

 dome is depressed convex, with a somewhat large proboscis on the 

 anal side (the spaces between the arms being a little greater on that 

 side). The surfaces of the plates are marked by node-like ridges 

 radiating from the centre, and the sutures between the plates are 

 deeply marked and apparently nearly flat in the bottom. 



The specimens vary from three-fourths of an inch to one inch in 

 height, with a diameter of one-half to three-fourths of an inch. They 

 occur as casts of the interior, and the characters of the exterior have 

 been derived from the natural mould in the limestone. 



Formation and locality. — In limestone of the age of the Niagara group 

 at Waukesha, Wisconsin. 



RhODOCRINUS ? RECTUS, N. S.* 

 PLATE XI. FIG. 10. 



Body subcylindrical, rounded below ; basal plates of medium size ; those 

 of the second range much larger, and supporting three other plates 

 in direct superposition, the last one or fourth plate of the series 

 sustaining two small arm plates. The intermediate range consists 

 of four plates in direct succession, the last one narrowed above and 



* Published in the first edition of the Report, page 318 as Crinocystites ? rectus, and corrected 

 in the addenda, page 379, as follows: Having made some careful examinations of the structure 

 of this species, I am induced to believe that it possesses five basal plates, which are shown to be 

 succeeded by five others, holding the place of subradials, and supporting two interradial plates, 

 while the obhque upper faces of the subradials support in succession three radial plates. 



