EXPLANATION OF PLATE LXXXI. 



Figs. 1-15. COMPOSITA SUBQUADRATA (Hall) p. 489 



1-4. Pedicle, brachial, posterior and lateral views of a nearly 

 perfect specimen. 5-8. Anterior, pedicle, brachial and pos- 

 terior views of another specimen. (W. M., No. 7627.) 



Chester Group, Chester, Illinois. 



9-11. Pedicle, anterior and lateral views of a nearly complete 

 specimen. 12-15. Brachial, lateral, anterior and posterior 

 views of a nearly complete specimen. (W. M., No. 13926.) 

 Chester Group, Chester, Illinois. 



Figs. 16-45. COMPOSITA TRINUCLEA (Hall) p. 486 



16-20. Pedicle, brachial, lateral, posterior and anterior views of a 

 very perfect specimen. 21-24. Pedicle, brachial, anterior and 

 posterior views of another specimen. 25-26. Pedicle and 

 brachial views of a third specimen. (W. M., No. 7620.) 27-30. 

 Pedicle, brachial, lateral and anterior views of a nearly per- 

 fect specimen. (W. M., No. 389.) 



Salem limestone, Spcrgcn Hill, Indiana. 



31-34. Lateral, pedicle, brachial and anterior views of a nearly 

 perfect, large example. (W. M., No. 13926.) 



Salem limestone, Hull's Hollow, Madison County, Illinois. 

 35-36. Pedicle and lateral views of a very narrow and elongate 

 example. 37-38. Brachial and anterior views of an old shell. 

 39-42. Pedicle, lateral, anterior and posterior views of a nearly 

 perfect specimen. 43. Brachial view of a nearly perfect 

 specimen. 44-45. Anterior and posterior views of another 

 specimen. (W. M., No. 7617.) 

 Pclla Beds, Pella, Iowa. 



Figs. 46-51. COMPOSITA LEWISENSIS n. sp p. 488 



46-48. Pedicle, brachial and posterior views of a nearly perfect 

 specimen. 49-51. Pedicle, lateral and anterior views of an- 

 other specimen. Cotypes. (D. K. G., No. 203.) 



Patrick Quarry, Middle Fabius River, Lewis County, Mis- 

 souri. 



Figs. 52-57. COMPOSITA PENTAGONIA n. sp p. 492 



52-54. Posterior, lateral and pedicle views of a very perfect 

 internal cast. 55-57. Anterior, lateral and brachial views of 

 another example. Cotypes. (D. K. G., No. 102.) 



Residual chert, South Branch, Callaway County, Missouri. 



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