EXPLANATION OF PLATE LXXV. 



Figs. 1-10. MARTINIA CONTRACTA (Meek and Worthen) p. 420 



1-4. Pedicle, brachial, lateral and anterior views of a very per- 

 fect specimen. 5-7. Pedicle, brachial and posterior views of 

 another specimen. 8-10. Lateral, brachial and anterior views 

 of a third specimen. (W. M., No. 14777.) 

 Chester Group, Red Bud, Illinois. 



Figs. 11-14. MARTINIA SULCATA n. sp p. 422 



11-13. Pedicle, brachial and anterior views of a nearly complete 

 specimen. 14. Brachial view of another specimen. Cotypes. 

 (W. M., No. 13677.) ' 



Chester Group, Meade County, Kentucky. 



Figs. 15-19. RETICULARIA SALEMENSIS n. sp p. 433 



Pedicle, brachial, lateral, posterior and anterior views of the 

 holotype. (W. M., No. 7558.) 



Salon limestone, Lanesi'ille, Indiana. 



Fig. 20. RETICULARIA PSEUDOLINEATA (Hall) p. 429 



Posterior view of an internal cast probably belonging to this 

 species. (W. M., No. 10764.) 



Residual chert, Springfield, Missouri. 



Figs. 21-33. RETICULARIA COOPERENSIS (Swallow) p. 428 



21-25. Pedicle, brachial, lateral, posterior and anterior views of the 

 holotype of R. hirta White and Whitfield. (U. M., No. 1367.) 



Kinder ho ok, Bed No. 7 , Burlington, Iowa. 



26-30. Anterior, lateral, pedicle, brachial and posterior views of a 

 nearly complete specimen. 30-33. Pedicle, anterior and bra- 

 chial views of another specimen. (W. M., No. 9701.) 

 Chouteau limestone, I'ettis County, Missouri. 



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