94 E. 11. Sellards — Codonotheca. 



which the fnictiiication here described ma}- belong, or that it 

 may represent an entirely new plant. 



My thanks ai-e due Dr. Alexander W. Evans for references to 

 recent botanical literature, and to Dr. David White and Dr. 

 G. K. Wieland, as well as to Dr. Evans, for suggestions on the 

 text and illustrations. Dr. E. E. Cumings has very kindly 

 made most of the drawings. The material on which the study 

 is based is contained in the fossil plant collection of Yale Uni- 

 versity Museum, made accessible to me through* the kindness 

 of Professor C. E. Beecher. 



Paleontological Laboratory, Yale University Museum, 

 New Haven, Conn., April 2, 1902. 



EXPLANATION OF PLATE. 



Plate VIII. 



Codonotheca caduca gen. et sp. nov. 



Figure 1. — The fleshy covering has disappeared from this specimen by 

 maceration, allowing the resistant area at the center, which still retains its 

 cylindrical shape, to stand out prominently. Strands I to III and VI are 

 visible, IV and V being hidden on the opposite side. Figure 11 is a photo- 

 graphic reproduction of a part of the same specimen with the covering 

 removed, exposing strands IV and V. x 2. 



Figures 2-3.— ^Obverse and reverse sides of a small specimen. The very 

 numerous large spores lie in a depressed channel along the segments from 

 the tip to the base. The cavity formed by the united bases of the segments 

 ends at c. A part of the upper side of the covering is broken away near the 

 bottom, allowing the spores to be seen within. The base of this specimen, as 

 preserved, is comparatively slender and is traversed by wavy lines. A con- 

 siderable part of the long slender petiole is preserved. Natural size. 



Figure 4. — The two bundles supplying the segment, and their origin from 

 two adjacent main strands below, are very well shown in this specimen. 



Natural size. 



Figure 5. — Plan of structure of the spore-bearing organ. The top is 

 represented as cut open and unrolled, the base as split down the center and 

 laid open. The cut is represented as passing between segments I and VI, 

 hence directly through strand number I. The end of the cavity is marked 

 at c. The cylindrical area at the base first breaks up into six main strands 

 (I to VI) which dichotomize and supply the twelve bundles to the spore- 

 bearing divisions. Natural size. 



Figure 6. — A group of spores imbedded in sphalerite, and having the sur- 

 face ornamentation well preserved. x 28. 



Figure 7. — Spores taken from the surface of the specimen illustrated in 

 figure 2. X 28. 



Figure 8. — A single spore ; showing the slit in the side, indicating prob- 

 ably the bilateral division of the spore mother-cell. Several dark bodies, 

 apparently representing stored food supply, are contained within the spore. 



x85. 



Figure 9. — Section through the spore wall ; showing a thick granular 

 outer, and a thin compact inner layer. x 200, 



Figure 10. — The specimen illustrated by this figure has suffered lateral 

 crushing, and the bundles are partly displaced, A few spores are still cling- 

 ing to the surface. Natural size. 



Figure 11. — Same specimen as figure 1, x 2. 



