EXPLANATION OF PLATE LXXX. 



Figs. 1-12. CLIOTHYRIDINA TENUILINEATA (Rowley) p. 478 



1-3, 4-6. Pedicle, brachial and lateral views of two specimens. (U. 

 M., No. 1358.) 



Kinderhook, Bed No. 6, Burlington, Iowa. 



7-9, 10-12. Pedicle, brachial and lateral views of two specimens, 

 metatypes. (R. R. R.) 



Burlington white chert, Louisiana, Missouri. 



Figs. 13-24. CLIOTHYRIDINA HIRSUTA (Hall) p. 479 



13-15, 16-18. Pedicle, brachial and lateral views of two specimens. 

 (W. M., No. 13920.) 



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

 19-21, 22-24. Pedicle, brachial and lateral views of two specimens. 

 (W. M., No. 1369.) 



Salem limestone, near Boonville, Missouri. 



Figs. 25-30. CLIOTHYRIDINA LENTICULARIS n. sp p. 480 



25-27, 28-30. Pedicle, brachial and lateral views of two specimens. 

 (W. M., No. 12992.) . 



St. Louis limestone, near Carondelet, Missouri. 



Figs. 31-60. CLIOTHYRIDINA SUBLAMELLOSA (Hall) p. 482 



31-33, 34-36. Pedicle, brachial and lateral views of two young speci- 

 mens having the form and size of C. hirsuta. (W. M., 

 No. 7628.) 



Chester Group, Chester, Illinois. 



37-39, 40-42, 43-45. Pedicle, brachial and lateral views of three 

 young specimens having the general character of C. hirsuta. 

 (W. M., No. 13921.) 



Lower Chester, Fairview Point, Hardin Co., Illinois. 

 46-48. Pedicle, brachial and lateral views of an undistorted but 

 somewhat exfoliated specimen. 49-50. Pedicle and lateral views 

 of another specimen. (W. M., No. 7613.) 



Chester Group, Chester, Illinois. 



51-53, 54-56. Pedicle, brachial and lateral views of two specimens 

 partially preserving the surface spines. (W. M., No. 7628.) 



Chester Group, Chester, Illinois. 



57-58. Brachial views of two different specimens. 59-60. Pedicle 

 views of two other specimens. (W. M., No. 14781.) 



Lower Chester, Fairview Point, Hardin Co., Illinois. 



Figs. 61-66. CLIOTHYRIDINA PARVIROSTRA (Meek & Worthen) p. 481 



61-63. Pedicle, lateral and brachial views of a slightly crushed 

 specimen. (W. M., No. 7611.) 



Keokuk limestone, Jersey County, Illinois. 



64-66. Brachial, lateral and pedicle views of a nearly complete 

 specimen. (W. M., No. 7614.) 



Keokuk limestone, Warsaw, Illinois. 



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