138 CYSTIDS AND BLASTOIDS. 



Schizoblastus melonoides ( Meek & Wokthen). 



Oranatocrinus melonoides Meek & Worthen , 1869: Proc. Acad. Nat. Sci., 



Phila., p. 88. 

 Granatoa^inus melonoides Meek & Worthen, 1873: Geol. Sur. Illinois, vol. 



V, p. 468, p]. ix, fig. 1. 

 Schizoblastus melo7ioides Ethridge & Carpenter, 1882: Ann. & Mag. Nat. 



Hist., art. IX, p. 246. 

 Schizoblastus 7nelonoides'KthT\6ge & Carpenter, 1886: Cat. Blastoidea, p. 



226, pi. VI, figs. 15-16. 



Similar to G. melo in general appearances, but readily dis- 

 tinguished, .aside from the distinctive generic characters, by 

 being much less lobate. 



Horizon and localities — Lower Carboniferous, Upper 

 Burlington limestone : Louisiana, Hannibal. 



Schizoblastus sayi C^humaed). 



Plate xviii, figs. 9a-l). 



Pentremites sayi Shumard, 1855: Geo. Sur. Missouri, Ann. Rep., p. 185, 



pi. B, figs. la-c. ; 

 Oranatocrinus sayi Shumard, ISQo: Trans. St. Louis Acad. Sci., vol. II, 



p. 376. 

 Granatocrinus sayi Meek & Worthen, 1869 : Proc. Acad. Nat. Sci., Phila., 



p. 84. 

 Pentremites potieri Hambach, 1880: Trans. St. Louis Acad. Sci,, vol. IV, 



p. 156, pi. B, fig. 4. 

 Schizoblastus sayi Ethridge & Carpenter, 1882 : Ann. and Mag. Nat. Hist., 



vol. IX, p. 246. 

 Schizoblastus sayi Ethridge & Carpenter, 1886 : Cat. Blastoidea, p. 224, pi. 



iii, figs. 1-3. 



Calyx subglobose, or ovoid; top flat. Basals rmall, flat- 

 tened, slightly protuberant. Radials very short, somewhat 

 wider than high, making up only about one-fourth the height 

 of the calyx ; bodies very small ; limbs short ; sinuses broad, 

 with raised margins. Deltoids large, forming fully three-fourths 

 the calyx. 



Horizon and localities — Lower Carboniferous, Burling- 

 ton limestone : Ash Grove ( Greene county), Louisiana, Han- 

 nibal, Helton (Marion county). Palmyra (Marion county), Ste. 

 Genevieve. 



