470 Explanation of Plates. 
-PLATE XLV. 
Fic. 1.—Pecopteris unita Brongn. Part of a pinna, with pinnules con- 
nate to above the middle. From the Le Roy shales. No. 1454, Uni- 
versity of Kansas collection. Natural size. 
Fic. 2.—Pecopteris unita Brongn. Enlarged pinnule. Twice natural size. 
Fic. 3.—Pecopteris arborescens (Schloth.) Brongn. A fertile pinnule, 
with the impressions of the large sporangia, about four to the synan- 
gium and grouped around a central point of attachment. From the 
Lawrence shales at Twinmound. No. 1228, University of Kansas col- 
lection. Twice natural size.. 
Fics. 4,5.—Pecopteris arborescens (Schloth.) Brongn. Single sterile 
pinnules, showing the simple veins. From the Lawrence shales at 
Twinmound and the Le Roy shales at Blue Mound. Nos. 1229 and 
1230, University of Kansas collection. Twice natural size. 
Fic. 6.—Pecopteris candolleana Brongn. Two of the pinnules, showing 
characteristic form and venation. From the Lawrence shales at Twin- 
mound. No. 1301, University of Kansas collection. Three times 
natural size. 
Fics. 7, 8.—Pecopteris candolliana Brongn. Pinnules referred doubtfully 
to this species. From the Le Roy shales at the Haverkampf farm. 
No. 1302, University of Kansas collection. Three times natural size. 
Fig. 9.—Pecopteris candolliana Brongn. Small pinnule referred doubt- 
fully to this species. From the Le Roy shales at the Haverkampf 
farm. No. 1825, University of Kansas collection. Twice natural size. 
Fic. 10.—Pecopteris vestita Lesqx. Two of the pinnules, with thick, 
scaly epidermis characteristic of this species. From the Cherokee 
shales, Lansing. No. 1277, University of Kansas collection. Twice 
natural size. 
Fic. 11.—Same species. The epidermis of the pinnules removed by acid 
to show the venation. Twice natural size. 
Figs. 12,13.—Same species. Pinnules with epidermis partly removed. 
Twice natural size. 
Fig. 14.—Oligocarpia gutbiert. Fertile pinnules. From the Lawrence 
shales at Twinmound. No. 12138, University of Kansas collection. 
Twice natural size. 
Fig. 15.—Pecopteris cf. miltoni Lesqx. From the Lawrence shales, Twin- 
mound. Enlarged. 
Fiés. 16-19.—Oligocarpia kansasensis sp. nov. Sterile and fertile pin- 
nules. From the Lawrence shales at Twinmound. Nos. 1100 and 1101, 
University of Kansas collection. Twice natural size. 
Fic. 20.—Mariopteris obtusiloba D.W. var. From the Le Roy shales. 
No. 1588, University of Kansas collection. Enlarged. 
Fig. 21.—Odontopteris minor. From the Le Roy shales at the Haver- 
kampf farm. No. 650, University of Kansas collection. Twice nat- 
ural size. 
Fic. 22.—Callipteridium sp. From the LeRoy shales at the Haver- 
kampf farm. Natural size. 
