226 



PALEOZOIC TIME. 



out, flower-like ; 430 shows the box-like body above, but wants the 

 arms. 



Figs. 429-431. 



Crinoids. — Fig. 429, Ichthyocrinus laevis ; 430, Caryocrinus ornatus ; 431, a, b, c, Stephano- 



crinus angulatus. 



Some of the characteristic Brachiopods are represented, natural 

 size, in Figs. 432 to 444 — all very abundant species in the Niagara 

 limestone. The shell of a large Lamellibranch, from the upper part 



Figs. 432-444. 

 432 



Beachiopods. — Fig. 432, Strophomena rhomboidalis ; 433, Leptfena transversal is ; 434, 435, 

 Atrypa nodostriata ; 436, Merista nitida ; 437, Anastrophia interplicata ; 438, a, Rhynchonella 

 cuneata; 439, a, 6, Leptocoelia disparilis; 440, a, Orthiabiiobus; 441, 442, Spirifer Niagarerais ; 

 443, 444, Sp. sulcatus. 



of the Niagara group, is represented in Fig. 444 A. Another more 

 common kind, of the genus Avicula, is shown in Fig. 445, reduced 

 one half in breadth ; and Figs. 446, 447 represent two Niagara Gas- 

 teropods. 



