Il ALt^oiit 



576 



See Pteraspis, for figure illustratiye of the internal struc- 

 ture of shield. 



PalaeasterP dyeri. Meek, American Jour. Sci. Vol. 3, 1872- 



Pal. Ohio, Vol. 1, 1873, page 58, plate 4, fig. 2 a, part of ven- 

 tral side of a specimen, part of disc, parts of rays, some mar- 

 ginal and ambulacral pieces with spines, a few dorsal pieces of 

 one ray distorted, the whole obscured by shale ; 2 S, magniUed 

 (X2) underside of part of one ray; 2 c, mag, (X2} part of up- 

 per side, ditto; 2 d, mag. (X3) two spines; 2^, mag. (X2) t/ie 

 madreporiform piece; 2 f.maq. (X3) two very small dorsal 

 spines. — III I, 



Palaeaster granulosns. Hall 20(h Regents Rpt. 1868 



nil- ^ m 3, 



Tai.O/iio 

 Vol. /. 

 Pi, /v. 



