EXPLANATION OF PLATE LXXVI. 



Figs. 1-3. ACAMBONA PRIMA White p. 449 



Pedicle, brachial and lateral views of the holotype. (U. M., No. 

 1705.) 



Burlington limestone, Burlington, Iowa. 



Figs. 4-6. EUMETRIA PERSTRIALIS Rowley p. 441 



Pedicle, brachial and lateral views of the holotype. (R. R. R.) 

 Burlington white chert, Louisiana, Missouri. 



Figs. 7-11. EUMETRIA ALTIROSTRIS (White) p. 438 



7-10. Brachial, lateral, posterior and anterior views of a nearly 

 complete specimen. 11. Brachial view of another specimen. 

 (W. M., No. 10575.) 



English River Gritstone, Maple Mill, Washington County, 

 Iowa. 



Fig. 12. EUMETRIA OSAGENSIS (Swallow) p. 439 



Brachial view of an imperfect specimen. (W. M., No. 12387.) 

 Chouteau limestone, Missouri. 



Figs. 13-17. EUMETRIA VERA (Hall) p. 444 



Pedicle, brachial, lateral, anterior and posterior views of a nearly 

 perfect specimen. (W. M., No. 13575.) 

 Chester Group, Chester, Illinois. 



Figs. 18-24. EUMETRIA VERNEUILIANA (Hall) p. 442 



18-21. Brachial, pedicle, anterior and lateral views of a nearly per- 

 fect specimen. 22-24. Pedicle, brachial and lateral views of 

 another specimen.^ (W. M., No. 7830.) 



Salem limestone, Spergen Hill, Indiana. 



Figs. 25-29. EUMETRIA COSTATA (Hall) p. 445 



Pedicle, lateral, brachial, anterior and posterior views of a nearly 

 perfect specimen. (W. M., No. 7833.) 

 Chester Group, Chester, Illinois. 



Figs. 30-34. EUMETRIA ACUTICOSTA n. sp p. 447 



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

 type. (W. M., No. 14778.) 



Chester Group, Johnson County, Illinois. 



Figs. 35-46. PTYCHOSPIRA SEXPLICATA (White and Whitfield) p. 435 



35-39. Pedicle, brachial, lateral, posterior and anterior views of a 

 nearly perfect specimen. 40-43. Pedicle, brachial, lateral and 

 anterior views of another specimen. (W. M., No. 9688.) 



Chouteau limestone, Pettis County, Missouri. 



44-46. Pedicle, brachial and anterior views of a metatype of Retzia 

 raricosta Rowley. (R. R. R.) 



Burlington white chert, Louisiana, Missouri. 



Figs. 47-52. HUSTEDIA CIRCULARIS (Miller) p. 451 



47-49. Pedicle, brachial and lateral views of a nearly perfect speci- 

 men. (D. K. G., No. 1801.) 



Chouteau limestone, Sedalia, Missouri. 



50-52. Pedicle, brachial and lateral views of another specimen. 

 (W. M., No. 9727.) 



Chouteau limestone, Pettis County, Missouri. 



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