JUL 29 1806 



SOME NEW SPECIES OF ECHINODERMATA AND A NEW 

 CRUSTACEAN FROM THE PALEOZOIC ROCKS. 



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



SUBKINGDOM ECHINODERMATA. 



CLASS CRINOIDEA. 

 ORDER PAL^OCRINOIDEA. 

 FAMILY ACTINOCRINID^. 



ACTINOCRINUS SAMPSONI, n. sp. 



Plate I, Fig. 1, opposite azygous side; Fig. 2, azygous side on 



the right. 



Species medium size. Calyx obconoidal, rathei' wider than long, 

 plates convex and radiately sculptured. Superior part of inter- 

 radial areas slightly depressed. 



Basals form a low cup about three times as wide at the top as 

 high. It is truncated below, about one-third wider than the 

 diameter of the column, and bears an hemispherical depression 

 for the attachment of the column. First primary radials about as 

 long as wide, three hexagonal, two heptagonal. Second primary 

 radials a little wider than long, about two-thirds as large as the 

 first and hexagonal. Third primary radials about as large as the 

 second, four of them pentagonal, the one on the left of the azy- 

 gous area hexagonal. They are axillary, and bear upon each upper 

 sloping side a single secondary radial, which is axillary, and, in 

 four of the rays, bear upon each of the distal sides two tertiary 

 radials, and upon each proximal side a single tertiary radial, 

 which is axillary, and suppoi-ts upon each upper side a single 

 quaternary radial, which arrangement gives to each of these rays 

 six arms. In the left lateral ray one of the proximal sides bears 



